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  • Mobile Connections in Las Vegas April 17-21

    - by Wallym
    I'll be speaking at Mobile Connections in Las Vegas.  The event is April 17-21.  The event is a cross platform mobile event.  There will be sessions on iOS, Android, WP7, Blackberry, and cross platform tools.  The sessions I am speaking on are:Introduction to Android via MonoDroid:This session will introduce writing native applications geared for the Android Platform based on .NET/C#/Mono. We’ll examine the overall architecture of MonoDroid, discuss how it integrates with Visual Studio, debug with MonoDroid, and look at a couple of example apps written with MonoDroid. This session is targeted to the .NET developer who wants to move to the Android mobile platform. While the session will be introductory for the Android platform, it will be intermediate/expert for those on the .NET platform.Web Development with HTML5 to target Android, iOS, iPadThis session will examine the features of the mobile browser, and how developers can leverage it to build applications that target mobile devices. This session is for developers looking to target Android, iPhone, WebKit based devices, and other devices through the mobile web with the same application code, development managers looking to Android, iPhone, WebKit based devices, and other devices through the mobile web with the same application code, and developers and development managers looking to build mobile web apps for devices that look like native apps. Attendees will be able to immediately begin building web applications that target the Android and iPhone platforms. The benefits of this approach are: Easy cross platform development No requirement to learn Objective-C/Xcode or Java/Eclipse Applications are immediately upgradeable. There is no requirement to go through the Marketplace or Appstore of either platform. Web developers are easier to find than Objective-C, Blackberry, WebOS, or Java programmerYou can register for the event and get $100 off via this link.

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  • How well will ntpd work when the latency is highly variable?

    - by JP Anderson
    I have an application where we are using some non-standard networking equipment (cannot be changed) that goes into a dormant state between traffic bursts. The network latency is very high for the first packet since it's essentially waking the system, waiting for it to reconnect, and then making the first round-trip. Subsequent messages (provided they are within the next minute or so) are much faster, but still highly-latent. A typical set of pings will look like 2500ms, 900ms, 880ms, 885ms, 900ms, 890ms, etc. Given that NTP uses several round trips before computing the offset, how well can I expect ntpd to work over this kind of link? Will the initially slow first round trip be ignored based on the much different (and faster) following messages to/from the ntp server? Thanks and Regards.

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  • OurSQL: The MySQL Database Community Podcast

    - by bertrand.matthelie(at)oracle.com
    @font-face { font-family: "Arial"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }a:link, span.MsoHyperlink { color: blue; text-decoration: underline; }a:visited, span.MsoHyperlinkFollowed { color: purple; text-decoration: underline; }div.Section1 { page: Section1; } For those of you not aware of it, Sheeri K. Cabral and Sarah Novotny are doing a great job running the "OurSQL" Podcast. A great and convenient way to learn more about various MySQL topics. @font-face { font-family: "Arial"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; } Episode 33 is about "Looking through the Lenz"...that is, Lenz Grimmer, MySQL Community Manager at Oracle and long time MySQLer.   Lenz talks about snapshot backups in general, MySQL backups with snapshots, and mylvmbackup, a script he wrote and maintains to easily take consistent MySQL snapshot backups. Check it out!   Keep up the good work, Sheeri and Sarah!

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  • SElinux stopping LVS from working with https

    - by J Hoskins
    LVS/piranha is setup and trying to get it to balance https instead of http. Setup https testing with wget - idea from this link. Works when I do it at the command prompt. With SELinux enforcing, the wget fails to run due to the lack of access to /dev/random. (Error - Could not seed PRNG; consider using --random-file. Disabling SSL due to encountered errors.) wget runs as system_u:system_r:piranha_lvs_t:s0 but the file/device /dev/random has system_u:object_r:random_device_t:s0 Also, wget is trying to getattr and read. How do you allow wget to use /dev/random so it will do ssl?

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  • Restoring an Exchange 2010 user's calendar without rest of mailbox

    - by AlamedaDad
    I am trying to restore a user's calendar from backup, which was deleted by a sync problem on her mobile device. I've been able to restore her mailbox without a problem but I had to link it to a new AD user since she deleted the calendar several days before she reported the problem and the current backups of her account didn't include any calendar events, but all of her current email. I had to restore the mailbox from the day before she deleted everything. I've tried sharing the calendar and opening it in her account, then copying or moving the contents, but I get an error that outlook can't do the task because there are personal items. I tried bringing up the "Recovery User" I created, in Outlook and exporting the calendar events to a .pst, then importing them into the user's real account, but they all get created in a sub-folder called "Recovery User." In case it matters, she's running Outlook 2010 and we're using Exchange 2010 SP1. Thank in advance for help with this problem...Michael

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  • I can't get router and switches configured properly for my home office network

    - by BernicusMaximus
    Networking Gurus, I recently built a new detached garage, with an office above. As such I had it tied into my existing home ethernet wiring. The ethernet signal is coming into the garage just fine, but I can not get my network configured the way I want because of problems trying to link the various router/switch devices. Please see the following links for the network diagrams: Home Network So basically, I can't my future state to work. I'm not sure if I'm using incompatible switches or what, but I tried the future state with some 4 port switches from best buy and had no luck. I resorted to setting up the Current State so I could operate. What I am looking for is help on how best to get my future state to work. Is this possible with my current configuration, and if not, what should I do? Any help is appreciated. Thanks, Bernie

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  • Is MS Forefront Add-in for Exchange server detecting HTML/Redirector.C incorrectly?

    - by rhart
    Users of a website hosted by our organization occasionally send complaints that our registration confirmation emails are infected with HTML/Redirector.C. They are always using an MS Exchange Server with the MS Forefront for Exchange AV add-in. The thing is, I don't think the detection is legitimate. I think the issue is that the link in the email we send causes a redirect. I should point out that this is done for a legitimate purpose. :) Has anybody run into this before? Naturally, Microsoft provides absolutely no good information on this one: http://www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Trojan%3aHTML%2fRedirector.C&ThreatID=-2147358338 I can't find any other explanation of HTML/Redirector.C on the Internet either. If anyone knows of a real description for this virus that would be greatly appreciated as well.

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  • Speaking at Dog Food Conference 2013

    - by Brian T. Jackett
    Originally posted on: http://geekswithblogs.net/bjackett/archive/2013/10/22/speaking-at-dog-food-conference-2013.aspx    It has been a couple years since I last attended / spoke at Dog Food Conference, but on Nov 21-22, 2013 I’ll be speaking at Dog Food Conference 2013 here in Columbus, OH.  For those of you confused by the name of the conference (no it’s not about dog food), read up on the concept of dogfooding .  This conference has a history of great sessions from local and regional speakers and I look forward to being a part of it once again.  Registration is now open (registration link) and is expected to sell out quickly.  Reserve your spot today.   Title: The Evolution of Social in SharePoint Audience and Level: IT Pro / Architect, Intermediate Abstract: Activities, newsfeed, community sites, following... these are just some of the big changes introduced to the social experience in SharePoint 2013. This class will discuss the evolution of the social components since SharePoint 2010, the architecture (distributed cache, microfeed, etc.) that supports the social experience, Yammer integration, and proper planning considerations when deploying social capabilities (personal sites, SkyDrive Pro and distributed cache). This session will include demos of the social newsfeed, community sites, and mentions. Attendees should have an intermediate knowledge of SharePoint 2010 or 2013 administration.         -Frog Out

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  • How can you add two lines of text on a single line in Word 2010?

    - by deodorant
    Odd title, wasn't sure how to word it. Basically, I have two separate fonts I want to be on the same line, for resume purposes. My name is in a large font at the top, and I want my email and website address right-aligned directly beside it, one on top of the other. However, I want the email and website to combine to the same height as my name. Is this even possible with Word? Surely it is. Here is an awesome graphic of what I'm hoping for. Thanks! edit Seems new users can't post images. Link is here: http://i.stack.imgur.com/0gc3s.png

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  • If I change Windows admin user password, then I can't login to Outlook, why?

    - by Tom
    I am seeing this strange behaviour with Windows 7 and Outlook 2010. If I change the password of User1 (Admin user), login, and start Outlook, it asks for the pasword. It keeps saying "password incorrect". I can login by using same password on the webclient. If I change User1's password back to last one, Outlook starts without any prompting and I'm able to send and receive emails. Is there any link between the user account, its password and the PST file's password?

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  • How to mark received sites as read in StumbleUpon toolbar?

    - by Prashant
    In stumbleupon toolbar for Firefox there is a "92" text is displayed in above pic, these are basically sites sent to me by my stumbleupon friends, so whenever I have sites from my friends, there in the toolbar and when I clicks the Stumble button then it shows those sites to me instead any new site. You can say these are link are like new mails, so there are 92 new mails for me, but I don't want to check those I just want to mark them as read in a single click, and move further to read other old mails. So Is there any option to mark these sites (sent to me by my SU friends) as read, so that when I click Stumble button then new sites will be shown instead sites which are sent by my friends??

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  • How to convert an image to a .dwg file

    - by erikric
    My girlfriend is making an art project where she is having an image printed and cut out on a metal plate. The firm responsible for doing this is demanding a .dwg file (and something called polyline; some sort of setting maybe?). Neither of us have heard about this file format, and I find the information about it quite confusing. Most pages seem to link to some schetchy "FooToBarConverter" software, that I frankly don't trust. Could someone please enlighten us on what we need to do, or point to some safe and preferably free software that could do this? (An explanation of the dwg format and the polyline thing would also be much appreciated)

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  • How to configure ldap on ubuntu 10.04 server

    - by user3215
    I am following the link to configure ldap on ubuntu 10.04 server but could not. when I try to use sudo ldapadd -x -D cn=admin,dc=don,dc=com -W -f frontend.ldif I'm getting the following error: Enter LDAP Password: <entered 'secret' as password> adding new entry "dc=don,dc=com" ldap_add: Naming violation (64) additional info: value of single-valued naming attribute 'dc' conflicts with value present in entry Again when I try to do the same, I'm getting the following error: root@avy-desktop:/home/avy# sudo ldapadd -x -D cn=admin,dc=don,dc=com -W -f frontend.ldif Enter LDAP Password: ldap_bind: Invalid credentials (49) Here is the backend.ldif file # Load dynamic backend modules dn: cn=module,cn=config objectClass: olcModuleList cn: module olcModulepath: /usr/lib/ldap olcModuleload: back_hdb # Database settings dn: olcDatabase=hdb,cn=config objectClass: olcDatabaseConfig objectClass: olcHdbConfig olcDatabase: {1}hdb olcSuffix: dc=don,dc=com olcDbDirectory: /var/lib/ldap olcRootDN: cn=admin,dc=don,dc=com olcRootPW: secret olcDbConfig: set_cachesize 0 2097152 0 olcDbConfig: set_lk_max_objects 1500 olcDbConfig: set_lk_max_locks 1500 olcDbConfig: set_lk_max_lockers 1500 olcDbIndex: objectClass eq olcLastMod: TRUE olcDbCheckpoint: 512 30 olcAccess: to attrs=userPassword by dn="cn=admin,dc=don,dc=com" write by anonymous auth by self write by * none olcAccess: to attrs=shadowLastChange by self write by * read olcAccess: to dn.base="" by * read olcAccess: to * by dn="cn=admin,dc=don,dc=com" write by * read frontend.ldif file: # Create top-level object in domain dn: dc=don,dc=com objectClass: top objectClass: dcObject objectclass: organization o: Example Organization dc: Example description: LDAP Example # Admin user. dn: cn=admin,dc=don,dc=com objectClass: simpleSecurityObject objectClass: organizationalRole cn: admin description: LDAP administrator userPassword: secret dn: ou=people,dc=don,dc=com objectClass: organizationalUnit ou: people dn: ou=groups,dc=don,dc=com objectClass: organizationalUnit ou: groups dn: uid=john,ou=people,dc=don,dc=com objectClass: inetOrgPerson objectClass: posixAccount objectClass: shadowAccount uid: john sn: Doe givenName: John cn: John Doe displayName: John Doe uidNumber: 1000 gidNumber: 10000 userPassword: password gecos: John Doe loginShell: /bin/bash homeDirectory: /home/john shadowExpire: -1 shadowFlag: 0 shadowWarning: 7 shadowMin: 8 shadowMax: 999999 shadowLastChange: 10877 mail: [email protected] postalCode: 31000 l: Toulouse o: Example mobile: +33 (0)6 xx xx xx xx homePhone: +33 (0)5 xx xx xx xx title: System Administrator postalAddress: initials: JD dn: cn=example,ou=groups,dc=don,dc=com objectClass: posixGroup cn: example gidNumber: 10000 Anybody could help me?

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  • Customize Your WordPress Blog & Build an Audience

    - by Matthew Guay
    Want to quickly give your blog a fresh coat of paint and make it stand out from the pack?  Here’s how you can customize your WordPress blog and make it uniquely yours. WordPress offers many features that help you make your blog the best it can be.  Although it doesn’t offer as many customization features as full WordPress running on your own server, it still makes it easy to make your free blog as professional or cute as you like.  Here we’ll look at how you can customize features in your blog and build an audience. Personalize Your Blog WordPress make it easy to personalize your blog.  Most of the personalization options are available under the Appearance menu on the left.  Here we’ll look at how you can use most of these. Add New Theme WordPress is popular for the wide range of themes available for it.  While you cannot upload your own theme to your blog, you can choose from over 90 free themes currently available with more added all the time.  To change your theme, select the Themes page under Appearance. The Themes page will show random themes, but you can choose to view them in alphabetical order, by popularity, or how recently they were added.  Or, you can search for a theme by name or features. One neat way to find a theme that suites your needs is the Feature Filter.  Click the link on the right of the search button, and then select the options you want to make sure your theme has.  Click Apply Filters and WordPress will streamline your choices to themes that contain these features. Once you find a theme you like, click Preview under its name to see how your blog will look. This will open a popup that shows your blog with the new theme.  Click the Activate link in the top right corner of the popup if you want to keep this theme; otherwise, click the x in the top left corner to close the preview and continue your search for one you want.   Edit Current Theme Many of the themes on WordPress have customization options so you can make your blog stand out from others using the same theme.  The default theme Twenty Ten lets you customize both the header and background image, and many themes have similar options. To choose a new header image, select the Header page under Appearance.  Select one of the pre-installed images and click Save Changes, or upload your own image. If you upload an image larger than the size for the header, WordPress will let you crop it directly in the web interface.  Click Crop Header when you’ve selected the portion you want for the header of your blog. You can also customize your blog’s background from the Background page under Appearance.  You can upload an image for the background, or can enter a hex value of a color for a solid background.  If you’d rather visually choose a color, click Select a Color to open a color wheel that makes it easy to choose a nice color.  Click Save Changes when you’re done. Note: that all themes may not contain these customization options, but many are flexible.  You cannot edit the actual CSS of your theme on free WordPress blogs, but you you can purchase the Custom CSS Upgrade for $14.97/year to add this ability. Add Widgets With Extra Content Widgets are small addons for your blog, similar to Desktop Gadgets in Windows 7 or Dashboard widgets in Mac OS X.  You can add widgets to your blog to show recent Tweets, favorite Flickr pictures, popular articles, and more.  To add widgets to your blog, open the Widgets page under Appearance. You’ll see a variety of widgets available in the main white box.  Select one you want to add, and drag it to the widget area of your choice.  Different themes may offer different areas to place Widgets, such as the sidebar or footer. Most of the widgets offer configuration options.  Click the down arrow beside its name to edit it.  Set them up as you wish, and click Save on the bottom of the widget. Now we’ve got some nice dynamic content on our blog that’s automatically updated from the net. Choose Blog Extras By default, WordPress shows previews of websites when visitors hover over links on your blog, uses a special mobile theme when people visit from a mobile device, and shows related links to other blogs on the WordPress network at the end of your posts.  If you don’t like these features, you can disable them on the Extras page under Appearance. Build Your Audience Now that your blog is looking nice, we can make sure others will discover it.  WordPress makes it easy for you to make your site discoverable on search engines or social network, and even gives you the option to keep your site private if you’d prefer.  Open the Privacy page under Tools to change your site’s visibility.  By default, it will be indexed by search engines and be viewable to everyone.  You can also choose to leave your blog public but block search engines, or you can make it fully private. If you choose to make your blog private, you can enter up to 35 usernames of people you want to be able to see it.  Each private visitor must have a WordPress.com account so they can login.  If you need more than 35 private members, you can upgrade to allow unlimited private members for $29.97/year. Then, if you do want your site visible from search engines, one of the best ways to make sure your content is discovered by search engines is to register with their webmaster tools.  Once registered, you need to add your key to your site so the search engine will find and index it.  On the bottom of the Tools page, WordPress lets you enter your key from Google, Bing, and Yahoo! to make sure your site is discovered.  If you haven’t signed up with these tools yet, you can signup via the links on this page as well. Post Blog Updates to Social Networks Many people discover the sites they visit from friends and others via social networks.  WordPress makes it easy to automatically share links to your content on popular social networks.  To activate this feature, open the My Blogs page under Dashboard. Now, select the services you want to activate under the Publicize section.  This will automatically update Yahoo!, Twitter, and/or Facebook every time you publish a new post. You’ll have to authorize your connection with the social network.  With Twitter and Yahoo!, you can authorize them with only two clicks, but integrating with Facebook will take several steps.   If you’d rather share links yourself on social networks, you can get shortened URLs to your posts.  When you write a new post or edit an existing one, click the Get Shortlink button located underneath the post’s title. This will give you a small URL, usually 20 characters or less, that you can use to post on social networks such as Twitter.   This should help build your traffic, and if you want to see how many people are checking out your site, check out the stats on your Dashboard.  This shows a graph of how many people are visiting, and popular posts.  Click View All if you’d like more detailed stats including search engine terms that lead people to your blog. Conclusion Whether you’re looking to make a private blog for your group or publish a blog that’s read by millions around the world, WordPress is a great way to do it for free.  And with all of the personalization options, you can make your it memorable and exciting for your visitors. If you don’t have a blog, you can always signup for a free one from WordPress.com.  Also make sure to check out our article on how to Start Your Own Blog with WordPress. Similar Articles Productive Geek Tips Manage Your WordPress Blog Comments from Your Windows DesktopAdd Social Bookmarking (Digg This!) Links to your Wordpress BlogHow-To Geek SoftwareMake a Backup Copy of your Production Wordpress Blog on UbuntuOops! 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  • Upgrading openSUSE 11.1 with Plesk Panel 9.3 to PHP 5.3

    - by Jonathan
    I'm running a VPS with openSUSE 11.1 (i586). On the VPS is Parallels Plesk Panel 9.3.0 installed. The current PHP-version is PHP 5.2.11. I want to upgrade PHP to PHP 5.3, but I can't find good instructions on how to do this. If I check for updates in Zypper, it says this is the latest release. In the Plesk Updates isn't an update either, both via the webbased interface and the command line interface. On Software.openSUSE.org I can find packages for PHP 5.3.1 in both the server:php/server_apache_openSUSE_11.1-repo and the server:php/openSUSE_11.1-repo (can't post the link because I'm a newbie here). But if I add one of those to Zypper, I still don't see an update. Is there here somebody who knows how to do this? And is it completely safe to update that way? I don't want to end up with a broken VPS... Thanks! Jonathan

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  • "Integratable" but not "integrated" GPL

    - by mgibsonbr
    There has been much debate over whether or not merely linking to a piece of code makes it a derivative work. I know FSF says "yes", so according to them I can't dynamically link a non-GPL compatible program to a GPL library and distribute the whole. But I could do that for private use, as long as no code is released to the public. That made me wonder: what if I don't redistribute the GPL code at all? If my program can work alone (reinforcing my claim that it's not a derivative work), but can do more if the GPL library is also installed to the system, couldn't I just release my application under my own licensing terms - without including any GPL code - and post instructions for anyone interested to separately download the GPL code and do the integration "for their private use"? I know it's against the "spirit" of the GPL, so I'm not suggesting it's a good idea to do that. However, this question is bugging me for some time, specially because of the implications of each answer: If I can not do that: can I write another library with a similar API? (before answering "of course you can", remember that having the same API would allow both libraries to be swapped at will by my customers - so I don't need to work too hard on my library or even make it "working". How to determine if a similar program is just similar or is a circumvention attempt?) If I can do that: can I also be paid to perform the service of installing the GPL library for a customer? (I sell them my program, install it in their machines, download and install the GPL library too) can I put the two programs in the same website? In two different CDs? (I know I said the idea was not to redistribute the GPL code, I'm just thinking in excuses people could use to claim they're not redistributing even though they are)

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  • Organizations &amp; Architecture UNISA Studies &ndash; Chap 7

    - by MarkPearl
    Learning Outcomes Name different device categories Discuss the functions and structure of I/.O modules Describe the principles of Programmed I/O Describe the principles of Interrupt-driven I/O Describe the principles of DMA Discuss the evolution characteristic of I/O channels Describe different types of I/O interface Explain the principles of point-to-point and multipoint configurations Discuss the way in which a FireWire serial bus functions Discuss the principles of InfiniBand architecture External Devices An external device attaches to the computer by a link to an I/O module. The link is used to exchange control, status, and data between the I/O module and the external device. External devices can be classified into 3 categories… Human readable – e.g. video display Machine readable – e.g. magnetic disk Communications – e.g. wifi card I/O Modules An I/O module has two major functions… Interface to the processor and memory via the system bus or central switch Interface to one or more peripheral devices by tailored data links Module Functions The major functions or requirements for an I/O module fall into the following categories… Control and timing Processor communication Device communication Data buffering Error detection I/O function includes a control and timing requirement, to coordinate the flow of traffic between internal resources and external devices. Processor communication involves the following… Command decoding Data Status reporting Address recognition The I/O device must be able to perform device communication. This communication involves commands, status information, and data. An essential task of an I/O module is data buffering due to the relative slow speeds of most external devices. An I/O module is often responsible for error detection and for subsequently reporting errors to the processor. I/O Module Structure An I/O module functions to allow the processor to view a wide range of devices in a simple minded way. The I/O module may hide the details of timing, formats, and the electro mechanics of an external device so that the processor can function in terms of simple reads and write commands. An I/O channel/processor is an I/O module that takes on most of the detailed processing burden, presenting a high-level interface to the processor. There are 3 techniques are possible for I/O operations Programmed I/O Interrupt[t I/O DMA Access Programmed I/O When a processor is executing a program and encounters an instruction relating to I/O it executes that instruction by issuing a command to the appropriate I/O module. With programmed I/O, the I/O module will perform the requested action and then set the appropriate bits in the I/O status register. The I/O module takes no further actions to alert the processor. I/O Commands To execute an I/O related instruction, the processor issues an address, specifying the particular I/O module and external device, and an I/O command. There are four types of I/O commands that an I/O module may receive when it is addressed by a processor… Control – used to activate a peripheral and tell it what to do Test – Used to test various status conditions associated with an I/O module and its peripherals Read – Causes the I/O module to obtain an item of data from the peripheral and place it in an internal buffer Write – Causes the I/O module to take an item of data form the data bus and subsequently transmit that data item to the peripheral The main disadvantage of this technique is it is a time consuming process that keeps the processor busy needlessly I/O Instructions With programmed I/O there is a close correspondence between the I/O related instructions that the processor fetches from memory and the I/O commands that the processor issues to an I/O module to execute the instructions. Typically there will be many I/O devices connected through I/O modules to the system – each device is given a unique identifier or address – when the processor issues an I/O command, the command contains the address of the address of the desired device, thus each I/O module must interpret the address lines to determine if the command is for itself. When the processor, main memory and I/O share a common bus, two modes of addressing are possible… Memory mapped I/O Isolated I/O (for a detailed explanation read page 245 of book) The advantage of memory mapped I/O over isolated I/O is that it has a large repertoire of instructions that can be used, allowing more efficient programming. The disadvantage of memory mapped I/O over isolated I/O is that valuable memory address space is sued up. Interrupts driven I/O Interrupt driven I/O works as follows… The processor issues an I/O command to a module and then goes on to do some other useful work The I/O module will then interrupts the processor to request service when is is ready to exchange data with the processor The processor then executes the data transfer and then resumes its former processing Interrupt Processing The occurrence of an interrupt triggers a number of events, both in the processor hardware and in software. When an I/O device completes an I/O operations the following sequence of hardware events occurs… The device issues an interrupt signal to the processor The processor finishes execution of the current instruction before responding to the interrupt The processor tests for an interrupt – determines that there is one – and sends an acknowledgement signal to the device that issues the interrupt. The acknowledgement allows the device to remove its interrupt signal The processor now needs to prepare to transfer control to the interrupt routine. To begin, it needs to save information needed to resume the current program at the point of interrupt. The minimum information required is the status of the processor and the location of the next instruction to be executed. The processor now loads the program counter with the entry location of the interrupt-handling program that will respond to this interrupt. It also saves the values of the process registers because the Interrupt operation may modify these The interrupt handler processes the interrupt – this includes examination of status information relating to the I/O operation or other event that caused an interrupt When interrupt processing is complete, the saved register values are retrieved from the stack and restored to the registers Finally, the PSW and program counter values from the stack are restored. Design Issues Two design issues arise in implementing interrupt I/O Because there will be multiple I/O modules, how does the processor determine which device issued the interrupt? If multiple interrupts have occurred, how does the processor decide which one to process? Addressing device recognition, 4 general categories of techniques are in common use… Multiple interrupt lines Software poll Daisy chain Bus arbitration For a detailed explanation of these approaches read page 250 of the textbook. Interrupt driven I/O while more efficient than simple programmed I/O still requires the active intervention of the processor to transfer data between memory and an I/O module, and any data transfer must traverse a path through the processor. Thus is suffers from two inherent drawbacks… The I/O transfer rate is limited by the speed with which the processor can test and service a device The processor is tied up in managing an I/O transfer; a number of instructions must be executed for each I/O transfer Direct Memory Access When large volumes of data are to be moved, an efficient technique is direct memory access (DMA) DMA Function DMA involves an additional module on the system bus. The DMA module is capable of mimicking the processor and taking over control of the system from the processor. It needs to do this to transfer data to and from memory over the system bus. DMA must the bus only when the processor does not need it, or it must force the processor to suspend operation temporarily (most common – referred to as cycle stealing). When the processor wishes to read or write a block of data, it issues a command to the DMA module by sending to the DMA module the following information… Whether a read or write is requested using the read or write control line between the processor and the DMA module The address of the I/O device involved, communicated on the data lines The starting location in memory to read from or write to, communicated on the data lines and stored by the DMA module in its address register The number of words to be read or written, communicated via the data lines and stored in the data count register The processor then continues with other work, it delegates the I/O operation to the DMA module which transfers the entire block of data, one word at a time, directly to or from memory without going through the processor. When the transfer is complete, the DMA module sends an interrupt signal to the processor, this the processor is involved only at the beginning and end of the transfer. I/O Channels and Processors Characteristics of I/O Channels As one proceeds along the evolutionary path, more and more of the I/O function is performed without CPU involvement. The I/O channel represents an extension of the DMA concept. An I/O channel ahs the ability to execute I/O instructions, which gives it complete control over I/O operations. In a computer system with such devices, the CPU does not execute I/O instructions – such instructions are stored in main memory to be executed by a special purpose processor in the I/O channel itself. Two types of I/O channels are common A selector channel controls multiple high-speed devices. A multiplexor channel can handle I/O with multiple characters as fast as possible to multiple devices. The external interface: FireWire and InfiniBand Types of Interfaces One major characteristic of the interface is whether it is serial or parallel parallel interface – there are multiple lines connecting the I/O module and the peripheral, and multiple bits are transferred simultaneously serial interface – there is only one line used to transmit data, and bits must be transmitted one at a time With new generation serial interfaces, parallel interfaces are becoming less common. In either case, the I/O module must engage in a dialogue with the peripheral. In general terms the dialog may look as follows… The I/O module sends a control signal requesting permission to send data The peripheral acknowledges the request The I/O module transfers data The peripheral acknowledges receipt of data For a detailed explanation of FireWire and InfiniBand technology read page 264 – 270 of the textbook

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  • Silverlight Cream for April 23, 2010 -- #845

    - by Dave Campbell
    In this Issue: Jason Allor, Bill Reiss, Mike Snow, Tim Heuer, John Papa, Jeremy Likness, and Dave Campbell. Shoutouts: You saw it at MIX10 and DevConnections... now you can give it a dance, John Papa announced eBay Simple Lister Beta Now Available Mike Snow posted some info about and a link to his new Flickr/Bing/Google High End Image Viewer and he's looking for feedback From SilverlightCream.com: Hierarchical Data Trees With A Custom DataSource Jason Allor is rounding out a series here in his new blog (bookmark it), and he's created his own custom HierarchicalDataSource class for use with the TreeView. Space Rocks game step 11: Start level logic Bill Reiss has Episode 11 up in his Space Rocks game ... working on NewGame and start level logic Silverlight Tip of the Day #3 – Mouse Right Clicks Mike Snow has Tip 3 up ... about handling right-mouse clicks in Silverlight 4 -- oh yeah, we got right mouse now ... grab Mike's project to check it out. Silverlight 4 enables Authorization header modification Tim Heuer talks about the ability to modify the Authorization header in network calls with Silverlight 4. He gives not only the quick-and-dirty of how to use it, but has some good examples, code, and code results for show and tell. WCF RIA Services - Hands On Lab John Papa built a bookstore app in roughly 10 minutes in the keynote at DevConnections. He now has a tutorial on doing just that plus all the code up. Transactions with MVVM Not strictly Silverlight (or WPF), but Jeremy Likness has an interesting article up on MVVM and transaction processing. Read the post then grab his helper class. Your First Windows Phone 7 Application As with the First Silverlight App a couple weeks ago, if you've got any WP7 experience at all, just keep going... this is for folks that have not looked at it yet, have not downloaded anything... oh, and it's by Dave Campbell Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • Two network cards in one Windows 7 PC

    - by Martin
    Hi, I've upgraded from Vista to Windows 7. On Vista I used to run one network card (Intel 82566DC -2 Gigabit) for my internet which was connected to a Dovado USB mobile broadband router connected to a 3G modem. The IP setup on the card is set on DHCP. The second card (3com Ethernet link) was used to connect to our town's local WUG (wireless user group) and all worked fine. Now the problem I have with Windows 7 is that when I connect to the internet with the (Intel) first card, the internet work fine but as soon as I connect the second card to the wug my internet drops. If I then disconnect the first card (internet one) and try to connect to the wug it works. It seems that the two cards are fighting each other. Is there maybe something I can do to fix the problem? As you probably can gather from this post is that I am not an expert on PC's so please if you do answer do I in simple terms. :) Thanks, Martin

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  • debian modem problems !!!

    - by Raafat
    hay there guys ... I'm a new Debian user, it looks like a very good choice 4 me, every thing is stable, free and easy to use. the problem is, I'm using my modem to establish a dial up connection to the internet (ppp) (a very old stupid way I'm forced to use for now), and using the KPPP application to do that, and nothing is working properly for me. it seems like it didn't recognize my modem or something. i already tried to make a few stuff, and now i know my modem is on /dev/tty0, so i made a link for that on /dev/modem, and query the modem using KPPP and it responded with something like: Ati : Ati0: Ati1: ... ... Ati7: with a textBox to fill up in front of each one of thees Atis, and now, when i press connect on kppp, it says modem ready, and that's it. BTW, my modem is MDC AC'97 any suggestions pleas ....

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  • Block diagram containing computer buses,motherboard..

    - by learnerforever
    Hi all, I am trying to understand computer architecture. In particular: - Physical view i.e. what all is packed inside the motherboard and what all outside - Conceptual view. how processor,memory,peripherals are connected. I am getting confused among various buses like local bus,PCI bus, SCSI bus,ISA bus,USB bus. I am looking for block diagrams. How is the USB port connected to processor ultimately? through PCI bus etc? Why do we have so many buses? What was it like before SCSI/IDE came? Does the diagram at : http://www.vaughns-1-pagers.com/computer/pc-block-diagram.htm look correct? It shows no connection between PCI bus and SCSI bus. Is that correct? I would greatly appreciate any other link especially of block diagrams/anatomy and not just textual writeup. Thanks,

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  • rsAccessDenied - SQL server 2008 reporting services

    - by rboorgapally
    Hi, I am running SQL server 2008 developer edition on windows vista home premium. I created a reporting services project that was built successfully in BIDS. When I try to deploy it it gives the following error: Error rsAccessDenied : The permissions granted to user 'COMP\MYSELF' are insufficient for performing this operation. The MYSELF account is the only account on the system. It has administrator rights. The reporting service is running with the LocalSystem service account. If I log in with the MYSELF account into reportmanager, I cannot see the site settings tab. Without the site settings tab, how do I add or change the roles for MYSELF account. In summary, please help me to open the reportmanager in the browser with the site settings link so that I can change the role of the user account.

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  • VMWare Guest NIC Teaming

    - by Justin Popa
    We're looking to add additional bandwidth to a VM running on an ESXi cluster running 5.1. How can I team these within the VM? I suspect I need to add a second e1000 and then install some Intel software to team them. Any idea which version of Intel driver? Is there some better software to use? EDIT: Sorry, neglected some information. The guest OS is Win2k8R2. The physical NICs on the host are 1Gbps. The reason this has come up is we are seeing the VM hitting near cap on the capability of a single 1Gbps link (Usually at 100-110MBps, bursting to 130s, but I think that may just be a UI math lie) and we're interested in seeing if adding an additional NIC in a teamed setting will increase the overall throughput.

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  • LastPass Now Monitors Your Accounts for Security Breaches

    - by Jason Fitzpatrick
    Staying on top of security breaches and how they may or may not affect you is time consuming. Sentry, a new and free addition to the LastPass password management tool, automates the process and notifies you of breaches. In response to all the recent and unfortunate high-profile security breaches LastPass has rolled out Sentry–a tool that monitors breach lists to notify you if your email appears in a list of breached accounts. The lists are supplied by PwnedList, a massive database of security breach data, and securely indexed against your accounts within the LastPass system. If there is a security breach and your email is on the list, you’ll receive an automated email notice indicating which website was compromised and that your email address was one of the positive matches from the breach list. LastPass Sentry is a free feature and, as of yesterday, is automatically activated on all Free, Premium, and Enterprise level accounts. Hit up the link below to read the official announcement. Introducing LastPass Sentry [The LastPass Blog] How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • Using Komodo IDE as Text editor from the OS X terminal

    - by lexu
    According to this URL I should be able to start Komodo IDE from the command line when I want to edit a file. I set up the symbolic link using (on single line) ln -sf "/Applications/Komodo IDE.app/Contents/MacOS/komodo" /Users/lexu/bin/komodo but when I type afg-2:~ lexu$ komodo .bash_profile I get dyld: Library not loaded: /usr/lib/libsqlite3.dylib Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security Reason: Incompatible library version: Security requires version 9.0.0 or later, but libsqlite3.dylib provides version 1.0.0 /Applications/Komodo IDE.app/Contents/MacOS/run-mozilla.sh: line 131: 4370 Trace/BPT trap "$prog" ${1+"$@"} and a dialog that says My guess is I need to somehow let Komodo know it needs to use different libraries? Does someone have this working?

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