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• Slow http traffic between VMWare guest and host.

  - by toluju

  I have a web application running as an http server inside the VMWare guest OS, and I'm trying to access the content from the host OS. The guest is running Ubuntu, and the host is running Windows XP. The problem is, when I try to access the application from a browser in the host OS, the content takes a very long time to load (up to a minute for a single page). A browser in the guest OS can access the application with no problems. I've tried using both NAT and bridged networking, but the results are the same. The Windows firewall is turned off. The connection itself appears fine, as ping requests from guest to host as well as host to guest complete without errors or delays. Both guest and host can access the external Internet connection without a problem. I'm using VMWare Player. Any ideas?

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• ssh works fine when using public interface, but slow when using private interface

  - by Kevin M

  My Linux(UbuntuEEE) to Linux(CentOS) ssh takes a long time to log in(~15 seconds) when using the private interface, but not when using the public one. I have a Linux box acting as my router. As such, it has multiple interfaces(75.xxx.xxx.xxx, 192.168.1.1). I can ssh in from the internal interface(192.168.1.65 to .1), but it will take a while. I can ssh into the public address, and it goes quickly(~1 second). I have another box that I can ssh into the inside interface from and it goes quickly. iptables is set to accept packets coming into the interface immediately. sshd's UseDNS is normally on; I get the same problem if I turn it off and restart sshd. I normally use public-key authentication; I have done a mv ~/.ssh/ ~/ssh/ and it will ask me for a password after going slowly. After logging in(using either interface), speed is quick. ssh client version(via ssh -v):OpenSSH_4.7p1 Debian-8ubuntu1.2, OpenSSL 0.9.8g 19 Oct 2007 ssh server version(via rpm -qv openssh_server):openssh-server-4.3p2-29.el5

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• processes slow after some time of actively running

  - by Yervand Aghababyan

  i have several cron jobs running on an ubuntu machine. each one does some pretty heavy load stuff. The cron jobs are parsing files and the bigger the file the longer it takes them to parse it. The strange thing is that if i make the files too big ( like 30mb) the script kind of hangs. It starts processing them really enthusiastically but after some time (something like 5-10 minutes) the cpu usage of the process drops a lot and it gets into some "zombie" state. If prior to this the process in htop was using 70-80% of the CPU then after this drop occurs it slows down to something like 5-10%. the load average drops down as well. The status of the processes sometimes changes to D in htop, which AFAIR stands for zombie. Today i noticed the same behavior of processes of mysql when executing heavy queries (a query took something like 4 hours to execute). the cron jobs are mostly php and during their processing most of the CPU eats the php process and not mysql. so i think the issue is not with a specific language/program but with the way the processes are "managed". The only other place i've seen similar behavior was on my Amazon EC2 micro instance when after some aggressive use of CPU the CPU quota was taking effect and everything was slowing down dramatically. This is a dedicated machine running ubuntu. what may be the cause?

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• Windows 7 Slow Searching

  - by Guy Thomas

  I have a new Windows 7 machine with twice as much RAM and a faster processor than my old Windows Server 2008 R2 Machine. I am disappointed that searching amongst my 10,000 image files takes twice as long on my new Windows 7 machine. Both machines have their own copy of these same files. In other respects e.g. opening my huge Outlook files, the new machine is faster. The Windows Search Service has started. And I set indexing on the image folder about 3 days ago. Any ideas why I suffer from this poor index / search experience? Other than adding / removing folders, is there anything I can do to tweak indexing?

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• Slow tracepath on local LAN

  - by Simone Falcini

  I am on EXSi and I have 2 instances: Ubuntu and CentOS. These are the network configurations Ubuntu eth0 Link encap:Ethernet HWaddr 00:50:56:00:1f:68 inet addr:212.83.153.71 Bcast:212.83.153.71 Mask:255.255.255.255 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:76059 errors:0 dropped:26 overruns:0 frame:0 TX packets:7224 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6482760 (6.4 MB) TX bytes:2080684 (2.0 MB) eth1 Link encap:Ethernet HWaddr 00:0c:29:46:5a:f2 inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:252 errors:0 dropped:0 overruns:0 frame:0 TX packets:608 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:42460 (42.4 KB) TX bytes:82474 (82.4 KB) /etc/iptables.conf *nat :PREROUTING ACCEPT [142:12571] :INPUT ACCEPT [5:1076] :OUTPUT ACCEPT [8:496] :POSTROUTING ACCEPT [8:496] -A POSTROUTING -s 192.168.1.0/24 -o eth0 -j MASQUERADE COMMIT *filter :INPUT ACCEPT [2:72] :FORWARD ACCEPT [4:336] :OUTPUT ACCEPT [6:328] -A INPUT -i eth1 -p tcp -j ACCEPT -A INPUT -i eth1 -p udp -j ACCEPT -A INPUT -i eth0 -p tcp --dport ssh -j ACCEPT COMMIT CentOS eth0 Link encap:Ethernet HWaddr 00:0C:29:74:1C:55 inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fe74:1c55/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:499 errors:0 dropped:0 overruns:0 frame:0 TX packets:475 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:68326 (66.7 KiB) TX bytes:82641 (80.7 KiB) The main problem is that if i execute this command from the CentOS instance ssh 192.168.1.2 it takes more than 20s to connect. It seems like it's routing the connection to the wrong network. What could it be? Thanks!

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• Files slow to save sometimes after Ubuntu upgrade

  - by Matchu

  I haven't quite been able to track down why this happens sometimes in Ubuntu 10.04 and not other times. I'll go into gedit or OpenOffice.org and try to save files, and, during some sessions, it will take up to 10 seconds to save the file, sometimes causing the program to become unresponsive. But during these same sessions, the files sometimes save instantly. This didn't start happening until after the 10.04 (Lucid) upgrade. I suspect that something is reading all the changes I make, or that there's some other big file action going on, or something like that. I disabled Tracker a while back, before the upgrade, and don't see it under the settings - could it be back under a different name under Lucid? You probably don't already know the answer, but how can I go about finding the cause of this problem?

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• Red Hat 5.4 slow processing

  - by yucefrizk

  I'm running Red Hat Linux 5.4 on HP DL580 server with 16 processors and 64 GB of RAM. I'm connecting to the server remotely through SSH. after entering the password, it takes time to return the command line, if I click ctrl+c during this time, I'll have the command line prompt but not the correct bash prompt (I have to run bash to pass to my correct prompt). I tried to install Apache on the server, ./configure took 4 hours to finish instead of 1 or two minutes, Oracle installation same behavior. Server Disks are mirrored using RAID controller. any idea what could be the reason of this slowness?

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• Very slow context menu in Windows 8

  - by burzum

  I've installed Windows 8 Pro on a blank new SSD, the system is on c:\. I do not think this problem was existent when I started using Windows 8 but I think it started to happen after I've symlinked (mklink /D) a folder from another drive, a SATA drive, to c:\xampp\htdocs. When I right click a file or folder inside the symlinked folder it always takes at least ~5-10 seconds until the context menu comes up. This also happens sometimes, but not all the time for files and folder outside of the symlinked folder. Also when I delete folders the delete folder dialog seems to get locked and does not continue. When I delete a folder using rmdir from the command line it works fine and pretty fast. It appears to me like the file explorer in Windows 8 is pretty bad compared to any other Windows I've used before? Any idea how to get these problems solved? I've already removed a lot of context menu entries; the only ones left are the tortoise git context menus but I'm sure that's not the problem.

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• Slow upload to Server 2008 DC, Downloads work as expected

  - by Anthony

  I have a Windows Server 2008 Domain Controller that I run as a do-it-all server. It has a GbE connection to the network and to every machine on the network. Downloads from the server file shares work as expected, between 70MB/s and 80MB/s to all the machines. However, when I try to copy files back up to the server, speeds fall to 7MB/s-10MB/s. I've disabled flow control and large send offload properties on all the NICs. I had this problem before and managed to fix it through some properties changes, but like an idiot, I never documented my fix and have since moved to a new server. Any ideas what I need to do to get the speeds to be more symmetric? EDIT: Remote differential compression is also disabled.

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• My internet speed became slow at night

  - by FrozenKing

  My internet plan is 512kbps unlimited and I get speed of average 64kbps but at night I used to get speed of 112kbps ..but recently my speed got normal like day time ...as per my view usually at night their is less traffic so I should get good speed like before ... Due to good speed I download and upload at night and my average download+upload per month is 60gb or 70gb... Is it that my ISP people putting restriction on my download and uploads.. I am confused.

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• Slow connection to Linux MySQL from Windows only (XAMPP)

  - by Josh

  I'm having a problem with a PHP project (using Kohana 3.2 framework) on my Windows 7 64-bit machine connecting to the database. The development database is stored on a Ubuntu Linux server on the local network. Other development machines running OSX and Linux are connecting fine. There are no other Windows development machines to test with. I can access MySQL fine using MySQL Workbench, and other projects (which I believe to be less database heavy) run mostly ok, only occasionally getting timeout messages. I'm constantly getting Maximum execution time of 30 seconds exceeded when functions such as mysql_query() are run in this particular project. Specifically, the Kohana file where the timeout occurs is MODPATH\database\classes\kohana\database\mysql.php [ 186 ]. My local set-up is: Windows 7 Professional 64bit XAMPP 1.7.7 (PHP 5.3.8) The output of uname -a of the Linux server is: Linux peach 2.6.38-11-server #50-Ubuntu SMP Mon Sep 12 21:34:27 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux I've tried the following, with no success: Disabling Windows firewall Switching between using a persistant and normal connection In my.cnf, adding skip-name-resolve Increasing wait_timeout Enabling bind-address I've run out of ideas now, and have no idea how to debug an odd issue like this. Has anyone come across this before, or have any idea how I could find the root of the issue, or what might be the problem?

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• NTFS write speed really slow (<15MB/s)

  - by Zulakis

  I got a new Seagate 4TB harddrive formatted with ntfs using parted /dev/sda > mklabel gpt > mkpart pri 1 -1 mkfs.ntfs /dev/sda1 When copying files or testing writespeed with dd, the max writespeed I can get is about 12MB/s. The harddrive should be capable of atleast 100MB/s. top shows high cpu usage for the mount.ntfs process. The system has a AMD dualcore. This is the output of parted /dev/sda unit s print: Model: ATA ST4000DM000-1F21 (scsi) Disk /dev/sda: 7814037168s Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 2048s 7814035455s 7814033408s pri The used kernel is 3.5.0-23-generic. The ntfs-3g versions I tried are ntfs-3g 2012.1.15AR.1 (ubuntu 12.04 default) and the newest version ntfs-3g 2013.1.13AR.2. When formatted with ext4 I get good write speeds with about 140MB/s. How can I fix the writespeed?

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• ASA Slow IPSec Performance

  - by Brent

  I have a IPSec link between two sites over ASA 5520s running 8.4(3) and I am getting extremly poor performance when traffic passes over the VPN. CPU on the device is 13%, Memory at 408 MB, and active VPN sessions 2 so the load on the device is particularly low. Screenshot of wireshark file transfer between the two hosts over the VPN: The large amount of Header checksum failures is alarming, but I am not sure what to check now. I perf is showing around 4-5 Mbit/sec with differing TCP window sizes. Show Run on the ASA http://pastebin.com/uKM4Jh76 Show cry accelerator stats http://pastebin.com/xQahnqK3

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• First request too slow even if I have a load balancer in the back

  - by adrian7

  I have an Apache 2 on Centos + bind with a wordpress website on it (e.g example.com). I have also set up, on another server in a different contry a load balancer (varnish:80 + nginx 127.0.0.1:8080) for it - which task is to server all static content under /wp-content/. Using Simple DNS editor I added an A entry to cdn.example.com pointing to the server's IP. So no extra work from a 2nd dns server. Then using htaccess I redirect all requests to jpg|gif|css|js files to cdn.example.com. That works and all files are saved on the "cdn" server and served right away. My problem is that for the first time I enter on example.com (e.g after restarting the computer or closing the browser) the load time is 1 up to 3 seconds, while any subsequent page loads take only 300 to 600 miliseconds. I know it might be a DNS issue, but I have done a cache check on several websites and cdn.example.com indicates the right IP. Do you have any ideas where I should dig to solve this first-time slowness?

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• Windows XP slow directory move

  - by maaartinus

  When I move a directory containing 900 MB in 4k files to another directory in the same filesystem, it takes nearly 1 minute and I hear the disk working. It's NTFS on Windows XP, the disk is quite fast (ST3100015 28AS) and works fine according to CrystalMark. I switched the antivirus off, and there's nothing else running (there's a lot of processes, but none doing any work). WTF is it doing instead of changing two directory entries?

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• Video encoding is very slow on Amazon EC2 instance

  - by Timka

  We are using Amazon EC2 m1.xlarge instance for video re-encoding and it looks like the actual encoding process takes a very long time. For an average 250mb video file it takes about an hour to encode. Intance: m1.xlarge (Xeon E5645 x 15gb ram) Windows Server 2008 R2 64-bit AviSynth version 2.5 (32bit) + ffms2 plugin (FFmpegSource 1.21) FFmpeg SVN-r13712 libavutil 3213056 libavcodec 3356930 libavformat 3411456 libavdevice 3407872 Number of parallel jobs is 3 Average CPU utilization ~96% Update#1 Source video: mp4/h.264 Parameters for ffmpeg: --enable-memalign-hack --enable-avisynth --enable-libxvid --enable-libx264 + --enable-libgsm --enable-libfaac --enable-libfaad --enable-liba52 + --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-pthreads + --enable-swscale --enable-gpl Video files encoded to mp4/h.264 with the following extra command line options: -threads 0 -coder 0 -bf 0 -refs 1 -level 30 -maxrate 10000000 -bufsize 10000000

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• Slow write speeds on new Gigabit home file server

  - by Ryan Holder

  So I finally got all my parts delivered to setup a home file/backup server this week. It's currently running Ubuntu Server and I'm using Samba to share files on my network. The server currently has a 2TB WD Green drive in it connected to a Asus M5A78L-M This is then connected via CAT6a to my new Gigabit switch (TP-Link TL-SG1005D). My home desktop is then also connected to this switch and again also through CAT6a cable. Currently when transfering files I will get a perfect 100MB/s read from the server to my Windows machine. When copying from my Windows machine to the server I get around 30/38MB/s. I know this drive is capable is faster speeds so would anybody have an idea of where the bottleneck is? Any help would be greatly appreciated :) EDIT: I have found ftp's write speed is much closer to what my Samba read speed is so I'm going to give it a guess that is a software problem rather than hardware

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• Keyboard Slow on a high power machine.

  - by Tim Pierson

  I am having a terrible time with my high powered machine. The keyboard is not displaying the keys as quickly as I type. Sometimes I have to wait up to a minute for the key to display. When I type ahead it sometimes loses characters. I am not sure where to start looking for this problem. It started about a month ago and I still have not figured out why. It does not always do it. But acts up about 2-3 minutes out of ever hour of use or thereabout. How can I look to isolate and find the problem, and solve it?

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• Just how slow should my VPN be?

  - by David Heggie

  I have a VPN setup between a remote office with 2 ADSL connections (8Mb downstream, 512Kb upstream) and a main office with a 10Mb EFM connection (10Mb both up and down). The VPN is an IPSec connection using a DrayTek 2930 router for the ADSL and a DrayTek 3200 router at the EFM end. However, I'm unable to get speeds over this connection (tested with iperf) of anything over 600Kb or so down from the main office (traffic will pretty much always be from the main office to the remote office) Whilst I realise that there is an overhead and I'm never going to get the "full" bandwidth available over this VPN, I'd like to think that there's something I should be looking at that may help improve it. I've tried using the DrayTek's built-in "VPN Trunking" features which are supposed to load-balance connections, but this doesn't seem to improve matters much. I guess my question is - is this the kind of performance I should expect from this kind of setup and I'll just have to live with it, or should I be able to squeeze something more out of it through some VPN magic?

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• Access report prints slow

  - by BoundforPNG

  I have an access report that comes up in a few seconds in the preview mode. When I try to print it takes about 45 seconds to print. Any ideas why this might be? This is done in Access 2003. Thanks, Paul

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• Deleting slow on X11 emacs

  - by Malvolio

  I'm running GNU Emacs 21.4.1 on a (remote) remote Linux ((CentOS) box, using my MacBook as the X-server. Works fine, unless I try to delete a word, line, or region. Then it locks up for 30 seconds or so. It sounds like a minor thing, but you realize how often you do a delete when you have to stop for 30 seconds every time. My theory is that Emacs is trying to put the text in the X-server cut-and-paste buffer, which is trying to put it in the OSX cut-and-paste buffer and somewhere along the way, the process is blocked until it times out. (My only evidence for this theory is (a) copy-region behaves the same way and (b) deleted text doesn't show up in the buffer.) Any suggestions appreciated. Edit: (setq interprogram-cut-function nil) fixed me right up. Which makes perfect sense. Thanks, Trey.

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• Windows XP: Slow start menu 'All Programs' response

  - by user17381

  When I click start, and then 'All Programs' (or select a sub menu of all programs) I get a grey menu which does not respond for about 5 seconds - after this it is ok. Any idea what is causing the menu to behave sluggishly? What can be done to fix this? Thanks Info Requested System Specs : Core2 T5500 @1.66GHz, 2GB Ram Windows version: XP Professional SP2 Happens Every time I click the menu (not just first time), has gradually been getting worse. Nothing too unusual at startup: ComodoFirewall, AVG AV, Truecrypt (only for small volume). AV Software: AVG.

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• windows 7, slow keyboard

  - by dwight kelly

  I am using Windows 7. the keyboard requires appoximately 1 second of hold down before it sends the letter. the pc wil click once at the 1/2 second then at 1 second the letter will show up. I thought the keyboard was bad and I purchased a new one (usb) and the same thing happened. I pulled out an old ps/2 keyboard, and the same thing. I booted the pc up and went into bios. the keyboard works fine there. I tried unninstalling and reinstalling the drivers, no change please advise

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• MySQL returning slow queries with result sets bigger than 30 rows

  - by josephs8

  When ever I run a query that exceeds 30 queries the time for the query to run goes from less than a second to over 10 seconds to get data. Example I run a query to return 29 rows, it takes .1 seconds, I run a query to return 31 rows it takes 11.2 seconds. I am running mySQL on Windows 2008 Server Dual Core 2.6Ghz with 3GB of Memory. The machine doesn't run anything else. It does have a instance of MSSQL running on the server but that does not get used at all. This only happens via PHP right now, If I manually run the query on the server it returns it in less than a second. The queries are not complicated either I have included one below: SELECT Name, Value FROM `bis_co`.`departments` LIMIT 31 What would be causing this issue and how can I correct this? Am I missing a configuration setting in MySQL or something. Thanks

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• G4 server running slow

  - by Abby Kach

  I have HP proliant ML 350 servers. We have 8 remote locations where users connect and log on to our server through DYNDNS to access our company ERP's to conduct day to day work. The base of our company ERP's is oracle for which we have a separate server.Now the problem is day by day the load on the server is increasing and the speed is getting slower and slower and users are facing a lot of issues . so I are planning to implement Sonic wall VPN. I conducted a demo of sonic wall but it was slower than the current speed of dyndns. the configuration of my server is as follows :- Linux HP ProLiant 370 Intel Xenon 3.20 GHZ 150 GB (72 * 2) 3 GB Suse Omega HP ProLiant 370 Intel Xenon 3.20 GHZ 300GB (72.8 * 4) Raid 5 4 GB Windows Server 2K3 Enterprise Edition Storage Box HP Storage Works 1400 Intel Xenon 2.00 GHZ 4 TB(1 TB * 4) Raid 5 2 GB Windows Server 2K8 Enterprise Edition Domain & Terminal HP ProLiant 350 Intel Xenon 3.20 GHZ 250 GB(72.8 * 3) Raid 5 4 GB Windows Server 2K3 Enterprise Edition Can some one help me as to how can i speed up my network at remote locations and reduce the problems of speed etc..

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