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• Does QEMU's performance (still) lag VirtualBox's and is there a way to improve it without kvm?

  - by Catskul

  I've noticed several articles that have claimed that QEMU is slower than VirtualBox (without hardware assistance) but several are years old, and the newest seemed to be from last year. Is it true that QEMU is slower than VirtualBox? If so why? Are there any tricks to close the performance gap? Some of my host systems do not have virtualization support so I'm especially interested in performance tips that work without the kernel module.

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• Practical way to implement prevention of IP Spoofing

  - by user1369975

  I am an undergraduate Computer Science student and was hoping to gain some knowledge of ways to help prevent IP spoofing but all the resources I have tried out elaborate this concept in a theoretical way. I want to try out my hands at one of the techniques like: http://en.wikipedia.org/wiki/Port_knocking http://en.wikipedia.org/wiki/SYN_cookies How do I simulate this whole situation in my own system were I myself am the attacker and I myself have to defend it? And once I have gained an understanding of it, then how do I start translating that into programming terms?

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• Verizon FiOS Speed concerns

  - by Josh K

  I'm working on getting a separate internet connection to run out and I was looking into available options. FiOS claims to offer 25Mb up / 25 Mb down as a maximum rate. Do they have listed minimum rates? Is there anything with fiber I should be concerned about? Special hardware, special routers, availability concerns?

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• How can I login (send text) with minicom?

  - by Travis

  I am attempting to login from a Linux client to a set top box running Linux via a USB to serial cable. When I power on the device, I can see the init messages scroll past, and I get to the login prompt, like this: (none) login: but I cannot login. The cursor stops flashing as if it is receiving input, but there is no response. My serial port setup is: Device: /dev/ttyUSB0 Bps: 115200 8N1 Hardware Flow Control: Yes Software Flow Control: No Any help would be greatly appreciated!

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• Removing raid 1 (mirroring) and leaving data on both drives

  - by ajma

  Hello, I have two drives in a raid 1 (mirroring) array. Hardware raid using whatever is built into an Intel motherboard. (asus P5BE) I'd like to remove one drive but keep the data in both (I want to put one of the drives into another machine). Can I go into the raid configuration and remove the array and have the data remain?

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• Websites that introducing new stuff

  - by user33929

  Is there any blog/website that introducing new funny/fancy websites or new tech (software/hardware)? I am talking about the site that may introduce digg.com, superuser.com, mint.com or delicious.com when these site first come out. Also, introducing new handy/useful 3rd party applications/tools. Thanks.

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• Recovering from backup without original install media

  - by KGendron

  A machine from my old job had a complete hard drive failure. I have backups but I'm running into severe problems restoring from them. The only install media was a secondary restore partition on the system's hard drive. I hate whoever came up with that idea more than i can possibly express with words. I spent several days trying to recover the disk - it is pretty well shot and none of my best tricks could even get it to show up in the bios/ The machine that broke is an hp with xp media center edition on it (I don't know why either). The backups were created using the default windows backup tool - I have .bfk file on an external hardrive that i am trying to restore from. I've replaced the hard drive. My home machine is running windows 7 64bit and i'm trying to use it as a platform to restore to the other disk. I downloaded the window 7 nt-restore utility, however no matter what i do it restores to my C drive rather than the specified drive. Fortunately win7 security settings prevented it from being a complete disaster - but still not a happy thing. I tried firing up the xp virtual machine. I can browse to the backups but it says they are invalid and refuse to let me view/ continue with the restore. I tried installing XP to an extra harddrive on my machine - however it bluescreens on me during the install process and I cry. I tried installing xp pro to the new drive and attempted to restore over it, it of course blackscreened on me as that was a stupid idea. I made two partitions on the new hard drive (Apparently the bios on this accursed piece of junk doesn't allow hd partitions larger than 200G anyways and thus fails 40 minutes into the install with an ever-descriptive "Disk Read Error". Guess how i spent last weekend? My last idea was to install xp pro to the second partition and then use it to restore from backup to the first. After the first restart it gives me the error "Windows could not start because of a computer disk hardware configuration problem. Could not read from the selected boot disk. Check boot path and disk hardware". My brain made one of those bad hard drive clicky noises. I've tried several boot disks but they don't seem to work. If anyone has a link to a good one it would be greatly appreciated. Anyone have any more ideas? - I really hate asking on what seems like such a simple issue but i am quite literally at my wit's end. Thanks - and sorry for the really long post.

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• Sending characters on Mac USB

  - by Olivier

  Hello, I have a RS232C/USB cable to connect an electronic device to my iMac Intel (MacOSX SnowLeo 10.6.3). Is there a utility program that allows for sending ASCII characters on the USB port that the RS232C device will understand? If possible, I'd rather avoid programming. I'd prefer an Automator script or a simple program with a GUI. Thanks

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• unavailable disc after installing windows7

  - by niao

  Greetings, I know this is a site about programming but I don't know where to put this question. The problem is that after installing Windows7 one partition is unavailable. The error is: "E:\ is unavailable" Access denied. There is no information about available space etc. How can I resolve this problem because there are some very important files on that partition.

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• why are only 4 of 6 cores visable to ESX?

  - by Arthur Ulfeldt

  I'm trying to determine if this is a hardware problem or a software issue so I thought I would ask the serverfault community if there are any known issues with ESX-4 not recognizing more than 4 cores per socket?

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• SQL Server - VMWare install - Utilize more RAM

  - by alex

  We have a SQL server machine - It’s a VMWare image (running on ESXi hardware etc..) It has windows 2008 x64 standard The SQL install is SQL 2008 standard The virtual machine has 12gb of RAM, and 4 virtual CPU The box is suffering from near 100% CPU a lot of the time I enabled the AWE- but SQL server only seems to use 3-4gb of RAM Is there a way of making it use more available ram more effectively? cache results for example..?

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• easiest way to automate all software installations for new users/computers?

  - by sorrrydoctorforlove

  Basically, for every new user we have about 30 different installers that all need to be run manually after an install of windows which is tedious/time consuming. We can't simply ghost/image the computers as they come because of the wide variety of hardware being used (all laptops). What would you suggest to run through all the installers automatically without requiring me to sit and click 'next'.. 'next'.. 'continue'.. 'no dont install msn toolbar please'?

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• Where to purchase an unlocked HTC Incredible or EVO 4G

  - by Eric

  Hello, Is it possible to buy an HTC EVO 4G (preferably), or the Droid Incredible (second choice) from a vendor whereby the phone is unlocked without a cellular plan? I just want to get a phone to test my Android app on over the built-in WiFi (for now). Please advise. Finally, does anyone know of a phone coming out in the next couple of weeks that is faster (hardware-wise) than the EVO 4G? Thank You! Eric

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• system is not Starting correctly when Booting windows

  - by sharza

  This menu allows you to select a hardware profile when Windows is started If your system is not starting correctly, then you may switch to a previous system configuration, important: system configuration changes made since the last successful start up will be discarded. Profile 1 If I choose Profile 1 (the only choice) Windows loads normally. This menu always appears when I turn on the computer. Is there any can solve it?

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• WPF & RenderTierCapability, what could cause a machine to be dropped from Tier 2 to 0?

  - by Erode

  I'm having an issue on some imaged machines where they will started out on Tier 2 and after some time of use (they are well spec'd kiosk machines, quad-core, Nvidia 550Ti), they drop to Tier 0 and effectively become useless. Restarting the machine doesn't seem to help. This is a problem more than just "missing hardware acceleration" because my application requires D3DImage to function (which requires Tier 2). Thanks for any help!

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• why is nautilus slow?

  - by Coding District

  I'm wondering why Nautilus is very slow when opening a directory containing lots of files. My /usr/lib dir for example has 1900 files and it takes approximately 5+ seconds to show everything. It has been like this since I installed Ubuntu few months ago and it's really quite annoying sometimes. I don't have powerful hardware but I know that Windows Explorer is so much faster than this. Is there anything that can be done to speed it up? Ubuntu 10.04

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• Fedora internet access and managing

  - by Fractal

  This questions speaks about a UNIX Fedora install, DWA-552 wireless adapter, and internet What are the required packages on a KDE GUI installation, and on the basic UNIX TUI installation, to access internet and manage wireless networks? On a larger scale, does anyone knows of an all encompassing list of basic functions (such as monitoring or hardware control) with their respective packages dependencies?

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• Is 768Mb RAM @ 333Mhz faster or slower than 512Mb RAM @ 400Mhz?

  - by Peter

  I have a simple question, but am not a hardware specialist. I have a small low-budget server with 512 Mb SD RAM, 400 Mhz. I have an extra 256 lying around, but it's 333 Mhz. I know I can add it to the system, and that it would automatically adjust the 400Mhz to 333Mhz. But my question is, which is faster/better for performance: 512 at 400Mhz, or 768 at 333Mhz?

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• Safari 4 starting up slowly on a Vista machine

  - by puri

  I have two PCs (different specs) with the latest Windows Vista and Safari 4 updates installed. In one machine, Safari 4 works great but in the other, it starts up slowly (less than a minute though) with harddisk sound indicating data access activities. I have cleared all internet caches and I am quite sure that there is no virus in both machines. Are there any other reasons that Safari performances are so different in comparably similar software and hardware environments?

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• How can I better collaborate the colors between my iMac and Macbook Air?

  - by kylehotchkiss

  I just got a Macbook Air and the differences in color between it and my 2009 iMac are driving me crazy. I know there were certain iMac models from that period with yellow tinting issues, but I did the gray bar tests and that doesn't appear to be the issue. (No hardware issue suspected) However, my iMacs tones are more yellow prone than the macbook and I was wondering how to collaborate these two devices better for design work.

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• Automatic sort for excel worksheet

  - by Joseph

  I want to create a to-do list in Excel that automatically sorts the to-do entries in a list, in order of ones to do first (closest deadlines). I would also like a section that shows the tasks for today and another for high-priority tasks coming up within a week. I have not programmed in Excel before. I know Python and JavaScript, but want an Excel solution that runs inside Excel (maybe using VBA, the Excel programming language). Is this sort of thing possible in Excel?

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• Updating Dell Vostro 3700 (Nvidia GeForce GT330M) display driver?

  - by iRubens

  I've bought this laptop "Dell Vostro 3700", having inside an Intel integrated graphic card and an Nvidia GeForce GT330M. Depending on energy saving mode it switches between the two video cards. When I try to update the video driver (now version 189.99 on Windows 7 64-bit) with that found on Nvidia site an error message say that it cannot find compatible graphic hardware. Dell doesn't provide a newer driver version. Has anyone solved the same problem?

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• How much it costs to run own hosting server

  - by Mirage

  I currently have VPS in my company and there i host about 20 websites. My company wants to set up server locally where they can host all websites rather using 3rd party VPS How it will cost e,g about upload ,download speed from data centre. Cpanel license IP registration, hardware , backups, electricity backups, Any other costs etc I would prefer centos

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• URL Based Internal Redirecting

  - by bculverscate

  Basically, we have one external IP address, several servers internally and want to redirect to each internal server based on request URL. We do not want to install another piece of hardware to do this for us but we have a firewall running Linux that currently forwards to only one of the internal servers. Example of our setup can be seen here: http://img23.imageshack.us/img23/5469/drawing1br.jpg NOTE: domain.com does not point to this box nor would we like it to. Subdomains are pointed manually to our global IP address.

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• How do you monitor and react when some scheduled job fails? - general question

  - by Dzida

  Hi, In many projects my team faced problems with 'silent fails' of some important components. There are lot of tasks executed behind the scenes and if somethings fails (either by errors in logic or hardware problems) in most cases responsible person is not notified (or not notified instantly). I know about heavy-weight monitoring tools that could solve some of that problems but there over-complicated and too expensive for our team. I am interested what are your solutions for such problems.

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