[Users] Loadavg virtualisation problem (028stab047.1+fix)
dev at sw.ru
Sun Nov 18 11:39:21 EST 2007
ok, Thanks a lot! I've added this info to the bug.
Dariush Pietrzak wrote:
>>I guess that what causes it, is having in guest more processes with runnable
>>state then reduced virtual cpus available.
> Faster/simpler way:
> - go to guest, run 8x dd if=/dev/zero of=/dev/null
> - load should fairly quickly start creeping up to 8.0
> - on HN set cpus to 1
> - let it run, then stop all the dd's
> eyck at etchdev386:~/40p-ovz/work$ w
> 16:13:44 up 5:21, 1 user, load average: 2.99, 2.94, 2.20
> (and stays like this, 15-minute average even grows)
> codev64:~# w
> 16:14:05 up 5:25, 2 users, load average: 0.00, 1.76, 2.65
> Playing with dd and set --cpus I also managed to cause load ~8 on HN while
> guest reported only 2.0
> .. I guess noone is doing things like this on production systems, and even
> if so, running chkpnt/restore as precaution when performing such changes
> is not out of the question.
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