[Users] Massive performance degradation

[Vitaliy Gusev]

Hi!

On 23 February 2009 20:34:54 Russell Miller wrote:
> Hi all,
> 
> One of the things that I have been tasked with at work is doing
> detailed performance analysis of openvz.
> 
> I have discovered that when running more than one guest and saturating
> the bandwidth of both of them (I ran netperf to the same host on two
> guests at the same time) I take a 20% hit in performance, invariably.
> ie (approximately).
> 
> One guest:  900 Mb/s
> Two guests:  700Mb/s total, around 350Mb/s per guest.

Can you specify a more information about tests: netperf parameters, CPU
activity for VEs and VE0, check failcounters. What do you
use for server side?
Can you run test - start the two netperf client threads in one VE? Also the same
test on VE0.


> 
> This is obviously a significant hit, and I can think of no reason
> offhand for it.  Has anyone here seen this kind of degradation?
> 
> --Russell

-- 
Thank,
Vitaliy Gusev