Try to remove Connection tracking of iptables on both host and guest machines. Also try to look at the "sysctl -a |grep tcp" output to see if it's optimized or you have too many opened connections in the kernel connections table. else then network everything works fine?

Eliezer

On 6/6/2013 10:59 AM, linuxsupport wrote:

No one experienced such issue?

On Mon, Jun 3, 2013 at 4:41 PM, linuxsupport lin.support@gmail.com wrote:

...

Hi All,

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?

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