Ubuntu Servers :: Can't Get Near Theoretical Network Maximum Speed
Mar 10, 2010
With three 1.5TB, 7200RPM drives in RAID0, they thrash. And yet the network out, 4 gigabit ports LAG'd together to create a single 4 gigabit connection, can't even push a single gigabit a second.
Here's what I've done so far:
I've enabled jumbo frames on the bond: ifconfig bond0 mtu 9000
Tweaked SAMBA performance:
Tweaked hdparm:
I haven't enabled jumbo frames on the switch but I'm almost sure that won't help me much after trying all this.
I'm running out of ideas here guys. The clients connected are pulling down images in both Ghost and WIM (ImageX) format. Large files too, upwards of 12 gigabytes.
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Jul 11, 2011
I have an AMD Athlon Regor 2.8 Ghz Dual Core CPU. About a month ago I overclocked the bad boy to 3.36 Ghz, on stock voltage. Since I have an AMD chip, I have the Cool and Quiet feature. With CnQ on, it never shows more than 2.8 Ghz (my stock speed), even on Full Load. However, with it off, it shows the correct 3360 Mhz all the time. I would like to keep CnQ, as well as my overclock. I've read in forums that it's okay to do that, that CnQ will automatically clock up to overclock when needed. But for me, with CnQ on, it only hits 2.8. Nothing more. Is this an Ubuntu problem? Is there a setting where I can change the maximum allowed speed of my CPU?
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Mar 19, 2010
I am currently in process of remodeling my home file server and would like some advice. The server has two internal hard drives that are rather small (10-15G) and I've now ordered a larger 2 TB drive which for the time being will have to run as an external drive through USB 1 (going to be rather slow).
I'm probably going to put the OS and swap on one of the internal drives but I was wondering if there was a good option for increasing the system's performance by making the second internal drive act as a kind of buffer for the 2TB usb drive. I'd like both the advantages of the large size of the USB drive and the fast read/write speed of the internal drive. Would it be possible to put it together so all reads and writes to the fileserver would first go to the fast internal drive (or even better, to internal drive and USB drive at once, although I suppose RAID is not an option with USB attached storage), and would then be put to the large drive. It would also be nice if the most used files from the large USB drive would be cached on the internal drive for fast read speed. I understood that ZFS would help me accomplish something the like but as I understand, it's not that easily available on Linux.
The current plan is to make the large drive a simple XFS drive and build a small daemon on the server that would simply move all new files from the internal drive to the USB one, once they are not used but it would be nice to have a more low level solution.
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Jan 18, 2010
Any command line tool to measure the network speed between my two linux servers without taking disk speed into account? My network is supposed to be 100Mb, but it doesn't feel like that so I wonder where the bottleneck is. The numbers that I see doesn't correlate well to that. So I'd like to know the speed network card to network card.
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Jul 31, 2011
Have 4xSamsung F4 HDDs in an Ex503, Raid 05 - don't know how to format them to get maximum speed out of them. I've read [URL] tor_issues and other things but guess i am too dumb. Some claim using GPT Partition table and gparted and i shouldn't have any problems because it's automatically doing what i want, but i am not sure about that.
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Jun 4, 2011
I use U-server. I set up an mail server as described in Ubuntu Documentation > Ubuntu 11.04 > Ubuntu Server Guide > Email Services.
How can I turn off maximum attachment size. On my server I don't want to limit the size of e mails that arrives.
I manage my server with webmin
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Sep 16, 2010
I'm writing a client-server program. There are more than 500 clients. I start a thread to process and response to each client and the processing needs some MySQL query. I'm looking for any possible hazards on my server!
1- Any limitation on "Maximum Simultaneous Socket Connection"?
2- Any limitation on using mysql?
3- As socket on Linux are file, Any limitation on number of sockets or threads?
I'm using a Linux server (Centos or Fedora or Ubuntu) and clients are both Linux and Windows.
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Jun 23, 2010
An arbitrary matrix can be solved using Gauss-Jordan elimination with O(n^3) complexity. A tridiagonal matrix (i.e. a special type of matrix) can be solved using Gauss-Jordan with O(n) complexity. That is, a for an arbitrary matrix, Gauss-Jordan is a cumbersome algorithm, but for a tridiagonal matrix, the algorithm can be expressed as a loop and a simple formula. If I were writing, for example, a compiler or some optimization program, is there a way to test the problem to see if it has become less complex, so I can express the algorithm more simply?
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May 4, 2011
I'm running nginx for static files and as a proxy server for a comet IM server on ubuntu Jaunty. On high load I'm hitting a limit of 1024 file descriptors. I've tried increasing this limit but still can't pass 1024. Does "more /proc/sys/fs/file-nr" gives me the global count of used file descriptors? Why do I see a maximum of 1024 open file descriptors in /proc/sys/fs/file-nr if this is the global count for the machine and each user should have at least 1024 allowed file descriptors by default? Is there a way to increase the limit while the server is running?
Some relevant info on my server:
sudo more /proc/sys/fs/file-nr
1024038001
sudo sysctl fs.file-max
fs.file-max = 38001
sudo nano /etc/security/limits.conf
...
* hard nofile 30000
* soft nofile 30000
I also added this to /usr/local/nginx/conf/nginx.conf:
worker_rlimit_nofile 10240;
Uncommented the following line in /etc/pam.d/su:
session required pam_limits.so
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Jun 4, 2010
Following function obtains the system-maintained structure for a message queue:
Code:
And following function simply resizes a message queue to a user-defined value, namely, "size":
Code:
My question is if there is a theoretical limit on user-defined message queue sizes.
To put in other words, is it possible to increase the default message queue size to any user-defined value as long as that certain value does not exceed the size of system's physical memory ?
I use 64-bit Ubuntu 9.04.
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Jan 17, 2009
I'm out in a village and we get more powercuts than I like, and recovering the journal on my server is getting rather irritating. I'm looking into getting a cheap UPS, the powercuts will last usually a maximum of 30 seconds, so I only need a few minutes.
I've been looking at:Plexus V 500VA UPS
Plexus V 1200VA UPS
APC SUA750I Smart-UPS 750VA
I know near to nothing about these things, my question is will those work with a machine with a 700W PSU? How do you know? The 500VA doesn't really mean much to me. Ideally I'd like to get my desktop on there too, but that's more for convenience than anything.
Will any of these do the job? Any Linux compatibility issues I should plan for? Any recommendations from personal experience is greatly welcome Edit: I will be happy with a UPS that can inform Linux power is down, and get the server to cleanly shutdown straight away, I'm more interested in a clean shutdown than maintaining power to use the machines during the outage. Edit 2: Can UPS devices be piggybacked to one another to provide extra uptime? i.e. Could I run 2 of the 30's so when the first runs down, the 2nd carries on?
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Feb 11, 2010
What is the maximum number of virtual network interfaces possible?I would like to create around 300 or so. This is needed to simulate a 300 node network.
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Apr 12, 2011
Can anyone suggest any good tweaks to speed up network please?
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May 27, 2011
Is there any method of selecting a network speed on my set up? It is capable of running at 100mb/sec but have the feeling that it isn't. Plug in vista on a lap top and no problems at all. It's also noticeably quicker. I assume that a straight install does set up bi directional and 100mb/sec?
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Jun 8, 2011
I'm facing an odd problem with a fresh install of OpenSuse 11.4 on a Dell PE-2950, using NIC Broadcom BCM5708C (rev 12) NetXtream II. Driver's are up to date. I'd installed vsftpd and configure it. I can connect from anywhere in the network where I setup this Server. The odd problem is that when I'm sending a big file (5.5 GiB for example), from another PE-2950 server (Windows Server 2003 64 bits R2) with another BCM5708C nic, the speed of the transfer starts at 90 MiB/s approx. but after 30 seconds , it drops to 15 MiB/s and never raise again. Driver's are up to date too.
However, from another Server in the network, a Dell R710 with SLES 10 SP3, the transfer speed is at 90-100-110 MiB/s all the time. The switch is a HP Procurve 2910al-24G, with all ports at gigabit speed. I'd tried with different FTP clients in Windows: WinSCP and the Windows's ftp client, but the result is the same: speed falls down after 30 seconds approx. using the Windows-Box.
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Nov 5, 2010
Is their from the CLI a way to test the internet speed between two servers?I'm thinking some sort of ping test that can calculate it or something.
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Oct 17, 2010
I find the rate of downloading package files from main repository is very slow in my computer(ubuntu OS).What can i do to speed up it?
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Mar 16, 2010
Is there a way to limit the speed that apache will send a page to a specific computer in my LAN? I would like to be able to test what my pages would be like if they loaded at 25KB/s for example. My Server is 192.168.0.2 and the other 'browser' computer is 192.168.0.4.
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Dec 4, 2010
I am playing with my new 5 disk 2TB software RAID 5 setup and after I had a hard drop out, I deleted the RAID set and recreated it with only 4 drives. I am working on getting the other drive included by doing a grow. (I hope)
The RAID is now rebuilding and seems to average a write speed of around 87 meg/sec, with lows in the high 60's to highs in the mid 90's but mostly in the higher 80's. But it is only showing about 16% CPU usage and maybe a second usage of around 7%.
Is this normal? It seems low to me, but it is a a quad core 2.5 GHZ processor. Screen shots attached.Is it "normal" for software RAID to drop a drive? I thought that was only a hardware RAID issue. Coder68
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Jun 19, 2011
I just noticed that files are transferring between my two computers at no more than 11.3Mb/s no matter what I do.
I regularly use sshfs to mount a drive on my main computer. But after noticing a dismal speed of 10Mb/s when copying a file, I thought maybe sshfs is slow. So I tried scp, and I'm getting 11.3Mb/s with scp. Using the blowfish cypher gave me no change to this, still exactly 11.3Mb/s.
I have a Gigabit network except for the cable, which is a 10meter, 100Mb/s cable.
I have a custom modified sysctl.conf file which I'll post here if needed.
Is there anything I can do about this pathetic speed ? Maybe a modification to my ssh config ? sysctl ? anything ?
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Mar 9, 2011
I've noticed this happening on some servers that I manage. I'll be downloading updates around 300 kb/s - 500 kb/s and then out of nowhere it will drop to about 3 kb/s. It will stay here forever, if I let it. I then have to cancel (Ctrl-C) the updates and restart them. This happens over and over and over until I finally get the full download. Why does this happen?
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May 3, 2011
im on 10.10(desktop) and mdadm was v2.8.1 from 2008, very out of date so i tried 3.2.1 -> no change. mdadm raid1 read speeds are the same as single disk. note i used the tests in the disk utility benchmarking tool at first --these showed raid 5 atleast to be much better but when i tried dd reads raid5 dropped off with larger data to almost the same (slow) speed as raid1. compare:
[code]....
using two partitions will be enough to show raid1 performs at single disk speed. I dont really want to use a 4 disk raid0 just to get the read speed i should be able to get with raid1 as i dont really care about the size loss. I would of course use raid10 but i have found this suffers from the same problem (achieve same read speed as 2 disk stripe). So whilst im shocked others aren't reporting this, unless there is some obscure reason why my system would give these results i think raid1 in not behaving as it should.
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Jul 18, 2011
Code:
$cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
[code]....
1/4 of my drives died after about 3 years of usage. I replaced it with an identical drive and did a mdadm -add to re-add it to the array. I expected this to take quite a long time, but not more than 1 million minutes to complete!
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Aug 2, 2011
I am upgrading my (as I call it) archive server. It is server used for archiving anything from user files, to images, backup data etc. lots of files of different sizes. It has 8 WD320RE disks in RAID5 for total little above 2T space. Disks were working perfectly good for 4 years. I will be replacing them with 8 WD2000RE disks in RAID-5, somewhere around 12T of usable space. I am currently using RaiserFS as file system, because it was hip at the time and as turned out once, when I had to copy data to other disk, is about 20% more efficient than ext3. I can save about 20% more data on Raiser. My question is. What file system do you suggest for using with new configuration considering that space is more valuable than speed.
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Jan 13, 2010
I have just formated and did a fresh install to start all over. I installed Ubuntu 9.1 and everything went fine but the network. The computer serve as a NAS and MediaPlayer. When getting a file from the server, I get a speed of 40-60mb/sec, which are good for a Gigabit network. When I try to put a file in, the speed can't pass more than 1mb/sec and often stop.
Here's the network info:
Code:
vric@XBMC:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:24:8c:a1:eb:55
inet addr:192.168.1.5 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::224:8cff:fea1:eb55/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[code]...
Edit: Looks like it's a Gigabit Problem. I connected the Ubuntu box to my Linksys router which is 10/100 and everything is MUCH faster.
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Nov 12, 2010
how to view my network connection speed. EG: 10/100/100 mbit. I searched and searched with no luck, I tried ethtool as well as mii-tool.
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Feb 7, 2011
When I'm using Ubuntu, I like to use the "system monitor" - specifically to monitor the network upload and download speed.
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May 3, 2011
How to limit network speed? Is there any apps in Centos can do that?
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May 4, 2011
In mi fstab file I mount a smb file server at boot. The code is:
//<ip address>/data /home/eng-2/NAS smbfs credentials=/home/eng-2/.smbcredentials,dir_mode=0775,gid=1000,uid=1000 0 0
Transfer rate to the server is approx 100 KB/s
Whilst transfer rate from the server 16 MB/s
If I mount it from Places>connect to server. Both to and from speeds are 16 MB/s. Why is it so slow when mounted through fstab?
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May 9, 2011
I have this new flatmate who uses all my Internet data up before the end of my monthly clockover. Instead of having to buy heaps of data top-ups at the end of the month, is there a way I can limit the speed of his computer through the network? I have tried looking through my router settings (which is a Thomson router) but there doesn't seem to be any options in regards to limiting activity of a system on the network.
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