Hi George,
When xapi is doing work it normally writes large amounts of log-spam to
/var/log/xensource.log explaining what it's doing. Could you have a look and
see (i) at what rate it is writing; and (ii) what kind of things it is writing
about? If there's nothing in the logs it would be worth capturing a 'strace'.
We try to ensure that xapi is idle when there's no management activity going on.
Another possibility is that the dom0 kernel is busy doing work that isn't
getting accounted to a separate task but is instead being accounted to existing
tasks. This happened once before (on an older kernel version) and it caused
xapi to look artificially very busy.
Cheers,
Dave
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of George Shuklin
> Sent: 20 July 2010 22:52
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] XCP - extreme high load on pool master
>
> Good day.
>
> We trying to test XCP cloud (4 hosts, each with 24Gb mem and 8 cores)
> with some product like load...
>
> But with just about 30-40 virtual machines I got an extreme load on
> dom0
> on pool master host: LA is about 5.5-6, and most time are used by xapi
> and stunnel processes.
>
> It's really bother me: what happens on higher load with few thousands
> of
> VMs with about 10-16 hosts in pool...
>
> top data:
>
> Tasks: 95 total, 3 running, 91 sleeping, 0 stopped, 1 zombie
> Cpu(s):19.4%us,42.1%sy,0.0%ni,35.8%id, 1.3%wa, 0.0%hi, 1.0%si,
> 0.3%st
> Mem: 746496k total, 731256k used, 15240k free, 31372k
> buffers
> Swap: 524280k total, 128k used, 524152k free, 498872k cached
>
> PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 17 -3 315m 14m 5844 S 52.3 2.0 5370:41 xapi
> 17 -3 22524 15m 1192 S 8.3 2.2 875:16.18 stunnel
> 15 -5 0 0 0 S 0.7 0.0 54:28.78 netback
> 10 -10 6384 1868 892 S 0.3 0.3 22:03.14 ovs-vswitchd
>
> dom0 on non-master hosts are loaded about 30% each.
>
>
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