*SOLVED* Slow Network [message #14899] |
Thu, 12 July 2007 17:54 ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
moorejon
Messages: 4 Registered: July 2007
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Junior Member |
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I am attempting to setup a HA cluster using OpenVZ and the guide posted in the wiki. During the process we noticed extremely slow network connections even from the host OS. iperf to another server on the same 100 mbps LAN reports
[ ~]# iperf -c ##############
------------------------------------------------------------
Client connecting to ##############, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local ########### port 39098 connected with ####### port 5001
[ 3] 0.0-10.2 sec 3.72 MBytes 3.05 Mbits/sec
Servers with the identical hardware on the same subnet running CentOS 4.x 64 bit report around 96 Mbps
Inside a VE we get the same or lower iperf results, so I am assuming this is an issue with the host OS rather than VE configuration options.
I have two test setups that provide the same results. One is CentOS 4.3 64 bit with kernel:
cat /proc/version
Linux version 2.6.18-8.1.4.el5.028stab035.1 (root@rhel5-64-build) (gcc version 4.1.1 20070105 (Red Hat 4.1.1-52)) #1 SMP Fri Jun 8 21:14:18 MSD 2007
The other is CentOS 4.5 32bit (couldn't get 4.3 32 bit to work with our kickstart network installer) kernel:
Linux version 2.6.18-8.1.4.el5.028stab035.1PAE (root@rhel5-32-build) (gcc version 4.1.1 20061011 (Red Hat 4.1.1-30)) #1 SMP Sat Jun 9 02:27:12 MSD 2007
Server hardware is Supermicro 1U, 2 x dual core Woodcrest 5110, 2 GB RAM, 2 x SATA 250 GB SATA drives, 2 x Intel(R) PRO/1000 Network
Any ideas what would cause this issue?
[Updated on: Fri, 13 July 2007 06:32] by Moderator Report message to a moderator
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Re: Slow Network [message #14902 is a reply to message #14900] |
Thu, 12 July 2007 19:09 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) |
moorejon
Messages: 4 Registered: July 2007
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Junior Member |
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I bow to your wisdom. Rebooted into stock smp kernel and get the same results. That will teach me to check the obvious first. I'll try a reload of the base OS no changes just to confirm these results....
Definitely something with the hardware. Appears we have about 4-5 servers slipped into the rack with this issue that only showed after trying to do something really network intensive like drbd.
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