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• SQL Management Studio is painfully slow on 32-bit Windows 7

  - by Sergei

  I've been having issues running anything in SQL Management Studio on Win 7. Basically, doing anything through the Management Studio interfaces completely freezes it up for a few minutes. Running a query is nearly impossible because it takes nearly 2 minutes just for the IDE to parse it and another minute to run it when the query itself completes instantaneously outside of the IDE. I'm not even going to go into the query designer. Anything with heavy user interaction such as editing a row in the result set where i have to click a cell freezes up the front-end. I tried reinstalling to no avail. Also tried running in compatibility mode without any difference whatsoever. Anybody had a similar experience? I'm running SQL Management Studio 2008 version 10.0.2531.0 on 32-bit Windows 7. Connecting to a remote SQL Server instance (2008 R2). Thanks.

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• Firefox takes a really long time to load some sites on Ubuntu

  - by Dave

  Hello guys, I have an issue here. Some sites - just a few - takes a really long time to load on Firefox. One example is A List Apart (http://www.alistapart.com/) which takes more than 30 minutes (yes, minutes, not seconds). On Opera, ou even through a telnet session, the problematic sites run without problem, fast as expected. I am using Linux 8.04, running Firefox 3.6.3 downloaded from mozilla site, with a 10M ADSL connection. I tried many tweaks I found googling, like disable IPv6, and change http pipelining settings on FF's about:config. None worked. I also used Firebug to find what phase during negotiation is the bottleneck. Findings are in the screenshot. Well guys, any idea what is the issue? And how to solve it? I repeat, this only happens with firefox (3.6.3 and prior versions), for a few sites only (even sites with much more requests, images, javascripts, stylesheets work fine), and http pipelines and IPv6 tweaks on about:config didn't work. Thanks

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• Where do vendors publish internal transfer rates of HDDs?

  - by red888

  So I've started to dig into storage fundamentals and found that in order to calculate the IOPS of a HDD you need to know the internal transfer rate of the drive (time it takes data to move from the platters to internal disk's cache). I went on newegg and even a few vendor sites and could not find this info published for any HDDs. Is it sometimes called something else? Take this link to a seagate HDD for instance. Nowhere do I see "internal transfer rate", but I do see something called "Sustained Data Rate OD"- is that the same thing? Just so you know where I'm getting this info (Book: "Information Storage and Management Storing, Managing..."): Consider an example with the following specifications provided for a disk: The average seek time is 5 ms in a random I/O environment; therefore, T = 5 ms. Disk rotation speed of 15,000 revolutions per minute or 250 revolutions per second — from which rotational latency (L) can be determined, which is one-half of the time taken for a full rotation or L = (0.5/250 rps expressed in ms). 40 MB/s internal data transfer rate, from which the internal transfer time (X) is derived based on the block size of the I/O — for example, an I/O with a block size of 32 KB; therefore X = 32 KB/40 MB. Consequently, the time taken by the I/O controller to serve an I/O of block size 32 KB is (TS) = 5 ms + (0.5/250) + 32 KB/40 MB = 7.8 ms. Therefore, the maximum number of I/Os serviced per second or IOPS is (1/TS) = 1/(7.8 × 10^-3) = 128 IOPS.

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• How to stop Firefox on an SSD from freezing when using the search box or submitting a form?

  - by sblair

  Firefox usually freezes for about a second whenever I search for something from the toolbar search box, when submitting a form, or when clearing the search box history. I suspect it has something to do with the auto-complete feature. Using Windows 7's Resource Monitor, the problem seems to be from the file: C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>\formhistory.sqlite-journal I believe this is a temporary file which caches database writes. The following screenshot shows the very high response times from six different searches, and that the queue length on drive C shoots off the scale: My Firefox profile is on an Intel X25-M G2 SSD. The problem doesn't seem to occur if I create a new profile on a hard disk drive. However, I'd like to know why the problem exists on the SSD in the first place (because it's an annoying problem which contradicts the reason I bought an SSD, and it might happen with other applications too), and how to prevent it. It still occurs if Firefox is started in safe mode, and with the recent beta versions. Updates: VACUUMing the Firefox profile databases does not help with this problem. The SSD Optimizer in the Intel SSD Toolbox does not help either.

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• Over gigabit connection, Teracopy does 31MB/s, but Windows 8 does it at ~109MB per second?

  - by Gaurang

  I got my brain-melting first taste of Gigabit networking today, between my 2011 MacMini and Windows 8 Pro desktop connected via Cat.5e to Linksys WRT320N(sporting dd-WRT). After making sure that the line speed on both systems showed 1Gbps, I proceeded to copying a 2.4GB MP4 from the Mini to the Win 8 desktop (SMB sharing). Although satisfied with the 30-34 MB/s that Teracopy was showing (that was a proper step-up for me from 10 MB/s), I still was curious about this massive difference in the advertised and real-world speed. 2 hours of Google had me believing that there were other factors that resulted in less speed, SMB being one. So just for the sake of doing it, I iPerf'd both the systems and guess what that showed - around 875mbps on both systems! I then stumbled upon this little piece of info after which I turned off Teracopy and copied the same file through Windows 8's regular copier. 109 MB/s. Molten brains :) What exactly is causing this? And can I enable such speeds via Teracopy? I really dig the extra features that Teracopy has, will surely miss them now :D

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• How can I setup a Proxy I can sniff traffic from using an ESX vswitch in promiscuous mode?

  - by sandroid

  I have a pretty specific requirement, detailed below. Here's what I'm not looking for help for, to keep things tidy and on topic: How to configure a standard proxy Any ESX setup required to facilitate traffic sniffing How to sniff traffic Any changes in design (my scope limits me) I need to setup a test environment for a network-sniffing based HTTP app monitoring tool, and I need to troubleshoot a client issue but he only has a prod network, so making changes to the config on client's system "just to try" is costly. The goal here is to create a similar system in my lab, and hit the client's webapp and redirect my traffic - using a proxy - into the lab environment. The reason I want to use a proxy is so that only this specific traffic is redirected for all to see, and not all my web traffic (like my visits to serverfault :P). Everything will run inside an ESX 4.1 machine. In there, there is a traffic collection vswitch in promiscuous mode that is not on the local network for security reasons. The VM containing our listening agent is connected to this vswitch. On the same ESX host, I will setup a basic linux server and install a proxy (either apache + mod_proxy or squid, doesn't matter). I'm looking for ideas on how to deploy this for my needs so I can then figure out how to set it up accordingly. Some ideas I've had were to setup two proxies, and have them talk to eachother through this vswitch in promiscuous mode, but it seems like alot of work. Another idea is a dual-homed proxy, but I've never seen/done that before so I'm not sure how doable it is for what I'd like. I am OK with setting up a second vswitch in promiscuous mode to facilitate this if need be, but I cannot put the vswitch on the lan (which is used so my browser would communicate with the proxy) in promiscuous mode. Any ideas are welcome.

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• Is there a way to have a working search bar in Explorer with Windows Search Service disabled?

  - by Desmond Hume

  I had to disable Windows Search Service (turn it off in Windows Features) for the reason that it was constantly using the hard drive in an excessive way (maybe because I've got very large quantities of files on my PC), noticeably slowing down my computer, and the Windows.edb database file grew way too large, about 2.5 GB in size. But the side-effect of it is that now the search bar is gone from any Explorer window and I miss this useful feature. So my question is, is there a way to stop Windows Search Service torturing my hard drive and still being able to search for files and folders directly from Explorer, perhaps using some third-party software?

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• MySQL maintenance - how to clear the buffer?

  - by Dougal

  We have a server running our web app (PHP / MySQL) which is SLOW. My predecessor says that: "We use to do database maintenance, which use to clear the buffer, cached and unwanted variables." And I wonder what on earth he means with that statement? Does he mean a simple optimize of the tables? Or the query cache? I understand MySQL but don't really know what he is describing. I would appreciate any pointers. Thanks.

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• Using wildcard domains to serve images without http blocking

  - by iopener

  I read that browsers sometimes block waiting for multiple images from the same host, and I'm trying to do everything I can to speed up page load times. One caveat: I need to serve files over HTTPS. Any opinions about whether this is feasible: Setup a wildcard cert for *.domain.com. Whenever I need an image, generate an number based on a hash mod 5 of the filename, and append it to an 'img' subdomain (eg img1.domain.com, img4.domain.com, img3.domain.com, etc.); the hash will make any filename always use the same subdomain, and therefore the browser should be able to cache the images Configure a dynamic virtualhost record to point all img#. subdomains to /var/www/img I am looking for feedback about this plan. My concerns are: Will I get warnings when my page has https:// links to multiple subdomains? Is the dynamic virtualhost record I'm talking about even possible? Considering the amount of processing this would require, is it likely to even produce any kind of overall benefit? I'm probably averaging a half-dozen images per page, with only half being changed on each page refresh. Thanks in advance for you feedback.

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• RAID 6 that can read with least 1000 Mbit/s?

  - by Diblo Dk

  I purchased a Dell PERC 6/i which I expected to be able to read with 1000 Mbps. There is not much to do now, but there are some things I wanted knowledge about for another time. I have configured it with four 2 TByte drives and RAID 6. It have 256 MByt ram and transfer rate of 300 Mbps. The benchmark test showed: Min read rate: 136.3 Mbps Max read rate: 329,6 Mbps Avg read rate: 242,2 Mbps What could I had done to get at least 1000 Mbps? Is it normal for internal and external RAID controllers to have a lower transfer rate eg. 300 Mbps? (I did not noticed at the time that it was not 3 Gbps) How would a RAID 10 had performed compared to RAID 6 or 5? Would it have been better to use software RAID (Linux) with the internal 3 Gbps SATA controller? UPDATE: The drives is SATA III 6 Gbps. http://www.seagate.com/files/staticfiles/docs/pdf/datasheet/disc/desktop-hdd-data-sheet-ds1770-1-1212us.pdf (2TB)

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• Jumbo Frames, ISCSI and ESXi

  - by vlannoob

  I have enabled Jumbo Frames (9000) in ESXi for all my vmNICs, vmKernels, vSwitches, iSCSI Bindings etc - basically anywhere in ESXi where it has an MTU settings I have put 9000 in it. The ports on the switches (Dell PowerConnects) are all set for Jumbo Frames. I have a Dell MD3200i with 2 controllers, each with 4 ports for iSCSI. Each of these ports is set to Jumbo Frames (9000) as well. So now the questions: Do I need to log into each Windows Server VM I am running and delve into the NIC properties and manually set it to Jumbo Frames in the NIC properties in the device Manager as well? Whats the best way of testing that Jumbo Frames are indeed working as intended?

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• What is the computer "doing" when it is running slow and task manager is not showing any CPU activity?

  - by Joakim Tall

  Typical example is when shutting down a memoryintensive application. It can take quite a while before the computer gets back up to speed. Is there some inherent cost in releasing memory? Or is it throttled by some kind of harddrive activity, and if so is there any good way to track that? I usually bring up task manager when a computer is running slow, and usually sorting by cpu activity can show what process is causing the problem, but sometimes there is no activity showing. And yes I "show processes from all users", I have been wondering this since the days win2k :)

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• VMWare Pre-Allocated vs. Growable, which is faster?

  - by tekiegreg

  In an effort to increase speed in my Vmware setup, I was thinking about converting a Windows XP Guest 32 bit I have from growable to pre-allocated, I'm currently running VMWare Workstation 7 with Windows 7 64 bit as the host. Specs: Dual Core CPU, one allocated to guest 4GB of RAM, 2GB to guest HD max capacity is 500GB, 150GB allocated to guest (I have 300GB left and don't mind parting with the space, currently HD is 80GB and converting would obviously add another 70GB of space), HD that guest is running on is separate from Host OS Either that or any other suggestions you have might be appreciated, thanks!

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• MySQL Locking Up

  - by Ian

  I've got a innodb table that gets a lot of reads and almost no writes (like, 1 write for every 400,000 reads approx). I'm running into a pretty big problem though when I do INSERT into the table. MySQL completely locks up. It uses 100% cpu, and every single other table (in other databases even) have their statuses set to "Locked" until the INSERT is done. This is a big problem because MySQL stays locked up for up to 4 minutes. I'm using version 5.1.47 (rpm from mysql.com). Any ideas?

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• Intel Core 2 Duo E6600 versus AMD Athlon II X2 3GHZ

  - by Billy ONeal

  Hello :) I have an Intel Core 2 Duo E6600 (2.4GHZ) in my current desktop, and I have a newer machine with an AMD Athlon II X2 3.0GHZ. I'm wondering how the systems will perform in comparison to one another. I'd like to use the AMD because it's 45nm and uses less power, but I don't want to do so at a loss in perforamnce. Which should perform better? Billy3

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• How to configure an ASUS motherboard.

  - by Absolute0

  I have an ASUS P7P55-M motherboard running with an Intel Core i5-750 processor and 4 GB RAM with 1600 MT/s speed. For some reason the default settings of the motherboard make all the components run at half their optimums. I have switched to the "D.O.C.P." profile and supposedly everything is as it's supposed to be (verified with CPU-Z). There is also an "X.M.P." profile and a manual one. Are either of the DOCP or XMP safe to go with? I wouldn't use the manual mode as I would likely mess something up real bad. XMP seems to be more memory oriented.

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• Why do most of us use 'i' as a loop counter variable?

  - by kprobst

  Has anyone thought about why so many of us repeat this same pattern using the same variable names? for (int i = 0; i < foo; i++) { // ... } It seems most code I've ever looked at uses i, j, k and so on as iteration variables. I suppose I picked that up from somewhere, but I wonder why this is so prevalent in software development. Is it something we all picked up from C or something like that? Just an itch I've had for a while in the back of my head.

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• Flash stream makes my internet slow and cpu rush

  - by user1225840

  When I try to watch a live Flash stream, my CPU usage goes up to 75% and my Internet speed goes down. If I run a test before the video-stream, my speed is ~40/10Mbps and during the stream it drops to 0.1-0.5Mbps. The stream is laggy and I can only watch one to two seconds at a time, start/stop/start/stop. I have cleared my history, cache, cookies, temp files, and so on. I have searched for malware and took care of that. I have updated my drivers, reinstalled Flash and everything else I can think of, but it remains slow. I had this problem before and it just started working normally from one day to another. Could it be a hardware problem?

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• Firefox/Flash memory monsters

  - by ULTRA_POROV

  1.5 gb. have 10 open flash sites (small sites). The sites are 2 - 4mb great :D :D :D congrats mozilla/adobe!

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• What is fastest way to backup a disk image over LAN?

  - by David Balažic

  Sometimes I boot sysrescd or a similar live linux on a PC to backup the hardrive over local network to my server. I noticed many times, that the transfer speed is not optimal (slower than HDD and network speed). Any rules of thumb what to do and what to avoid? What I typically do is something like: dd bs=16M if=/dev/sda | nc ... # on client nc ... | dd bs=16M of=/destination/disk/backup1 # on server I also "throw" in lzop (other are way too slow) and sometimes on the fly md5sum calculation (both of uncompressed and compress source). I try to add (m)buffer (or other alternatives) to improve throughput (and get a progress indicator). I noticed that even with enough free CPU, adding commands to the pipeline slows things down. Typically the destination is on a NTFS volume (accessed via ntfs-3g, with the _big_writes_ option).

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• What's throttling the database?

  - by Troels Arvin

  Hardware: Intel x86_64 with 192GB of RAM. OS: CentOS 5.4 x86_64. DBMS: DB2 v. 9.7.1 64 bit. During certain special workloads (e.g. parallel REORGs/RUNSTATs), I've seen the server transporting 450MB/s with 25000IO/s (yes, there is probably some storage system caching happening here) while all CPU cores were happily working in an even mix of usermode/wait. And disk benchmark tools can also bring some very satisfying bandwith and IO/s numbers to the table. On the other hand, we also have another scenario: A single rather complex query with at least one large table scan. db2's "list applications" reports that the query is Executing (not locked). IO: At most 10MB/s, 500 IO/s; CPU: two cores in 99.9% wait state, all other cores 100% idle. The tables which the query reads from have been altered to have LOCKSIZE=TABLE, so I would think that lock list work is zero. What's going on in such a situation? What tools/snapshots/... can I use to gain better insight in such a case?

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• SQL Server Full Text Search resource consumption

  - by Sam Saffron

  When SQL Server builds a fulltext index computer resources are consumed (IO/Memory/CPU) Similarly when you perform full text searches, resources are consumed. How can I get a gauge over a 24 hour period of the exact amount of CPU and IO(reads/writes) that fulltext is responsible for, in relation to global SQL Server resource usage. Are there any perfmon counters, DMVs or profiler traces I can use to help answer this question?

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• CPU and HD degradation on sourced based Linux distribution

  - by danilo2

  I was wondering for a long time if source based Linux distributions, like Gentoo or Funtoo are "destroying" your system faster than binary ones (like Fedora or Debian). I'm talking about CPU and hard drive degradation. Of course, when you're updating your system, it has to compile everything from source, so it takes longer and your CPU is used at hard conditions (it is warmer and more loaded). Such systems compile hundreds of packages weekly, so does it really matter? Does such a system degrade faster than binary based ones?

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• windows 2000 freezing during large disk write

  - by robert

  We have a windows 2000 sp4 server which freezes up for about 1 minutes while its web-app does a ~500mb write operation. I can see the webapp start to do I/O activity (through process explorer) then the RDP session becomes unresponsive, you can click on windows and buttons but nothing happens. When the disk write finally finishes the session 'catches up' on all the mouse clicks you did during the freeze in a mad flurry of window activity and the server returns to normal. During the freeze the web-app stops as well. The same behaviour happens on the console of the server. (so I know its not a network thing) Nothing appears in the Event logs. Its like nothing happened. I have upgraded all the HP hardware drivers to the latest proliant support pack. And also run a HP hardware diagnostics which found nothing wrong. What would cause a disk write to lock the rest of the OS?

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• Monitoring User Login time

  - by beakersoft

  Hi, i have recently been given the task of trying to work out why the login time (not machine boot time) for some of our users seems slow. The vast majority of clients (95%) are running on XP sp3, Windows 2003 domain controlers. Most users have the same model of machine. I would like to be able to see how long each of the polices are taking to load (if possable split user and computer) and any other info that might help (services starting etc) I changed the userenvdebuglevel reg option to generate the userenv.log file but it did'nt contain very much info Thanks Luke

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