[CentOS] Network performance issue on CentOS 6 KVM

Thu Jun 6 21:25:40 UTC 2013
Eliezer Croitoru <eliezer at ngtech.co.il>

Try to remove Connection tracking of iptables on both host and guest 
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?


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 at 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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