[Lxc-users] [MySQL] Weird performances problem between containers on a same host

[Mauras Olivier]

Hello,

I have several containers running on a host - ~10
One of them is running a MySQL database. Several of the others are running
php code under apache that fetch datas from the database.

Host is using eth0, while my containers are on a bridge using eth1, and
configured in macvlan bridge mode. Host runs SL6 with 2.6.32 RH kernel -
Host is a VMWare ESX virtual machine for that matter.
Ping latency between containers is at an average of 0.050 ms

What i noted, is that one webapp were getting very slow... After
investigating, the only thing that i could find, is that requests from
containers are _slower_ than from any other hosts.

See below:

container1 ~ # time (echo "select * from testsuites;" | mysql -h
container_mysql -u nmp -pxxx testlink)
id      details
42
(... cut only 25 entries anyway)

real    *0m0.875s*

Time varies between 0.8 and 1.2s

>From the host or another VM on the same network with the exact same request:

real    *0m0.022s*


So that particular app that can loop over 19 requests takes sometimes up to
20s to display a page instead of ~0.5s from another host...

Is there some sysctl/settings to tweak or it's just not relevant to make
requests between containers on the same host??


Thanks,
Olivier
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