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Network performance issue on CentOS 6 KVM

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I am using CentOS 6.4 on 4 servers, guests are also CentOS 6.4

Network is setup using virtio, and vhost, this works well but sometime I see connection issue from application to DB.

I found that sometimes latency increases from 0.200 ms approx to 123ms or even more sometimes, this happens only for 1-2 packets but keep happening after sometime.

CPU load remains under 1, CPU usages is around 20-30%.

If I ping from host machine to host machine then there is consistent latency, this only happens when ping from a guest machine to either other guest machines or a host machine.

Did anyone face similar issue?

posted Jun 3, 2013 by anonymous

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I just received a Supermicro server back from factory repair. Installed CentOS 6.3 x86_64 fresh from DVD (tried with 6.4, same result). Everything goes fine until i install Virtualization* yum groups. Virtualization is enabled in BIOS. Server boots, CentOS loads and i have even a login prompt. If i'm fast enough to enter login name and password, shell works for about 10 sec. Then, it seems to hang. Pressing CTRL-C seems to work as i see it on screen (CTRL-C text).

I'm used to Xen in CentOS 5 where we can choose a non-Xen kernel at boot time. With CentOS 6 and KVM, i'm kinda lost! I Googled a lot and didn't find anything to disable KVM / select a a non-KVM kernel a boot up time. The server has been repaired but i'm not sure if there is still other problems that prevent KVM to work. I know that they installed the last BIOS version. I have other identical servers that works well with KVM. I tried to disable all i saw for virtualization support in BIOS, result is the same. I did memtest86 tests without problem.

Here are the specs:

Supermicro 6026T-3RF (mainboard X8DT3-S)
BIOS 03/17/12 15:50:21 Ver 2.1
Xeon E5520
Kingston 12 Gig RAM (Triple Channel)
LSI 9240-8i

What should i do to debug this? Any pointers, URL, etc would be greatly appreciated!


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