RE: [Xen-devel] Too much VCPUS makes domU high CPU utiliazation

[MaoXiaoyun <tinnycloud@xxxxxxxxxxx>]

My kernel version
http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=commit;h=ae333e97552c81ab10395ad1ffc6d6daaadb144a
 
I think those patch are inclued.
 
BTW, my irqbalance is disabled in dom0.
 
thanks

 
> Date: Wed, 18 May 2011 12:39:50 -0400
> From: konrad.wilk@xxxxxxxxxx
> To: tinnycloud@xxxxxxxxxxx
> CC: xen-devel@xxxxxxxxxxxxxxxxxxx; george.dunlap@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Too much VCPUS makes domU high CPU utiliazation
>
> On Thu, May 19, 2011 at 12:19:11AM +0800, MaoXiaoyun wrote:
> >
> > HI:
> >
> > I have a host with 16 physical CPUS. Dom0 has 4 VCPUS.
> >
> > When only start a domU-A(windows 2003 x86 64rc 2) with 16 VCPUS, it starts quickly and eveything is fine.
> >
> > But if I first start domU-B, which has 2VCPUS, domU-C 4VCPUS, and domU-D 8 VCPUS, later I start DomUA again,
> > (so we have total 34 VCPUS, plus dom0), it will takes very long time for domU-A to start ,and during the start, its CPU
> > utilizaiton is around 800% from xm top, after its start, it response very slow in VNC, ans CPU utiliazation keeps hig h.
> > And right after I destoy other 3 domUs, domUA CPU drops to normal.
>
> You might be missing some patches for the Dom0 irq round-robin code. Is your Dom0 2.6.32 pvops?
> Look for these patches in your git log:
> xen: events: Remove redundant clear of l2i at end of round-robin loop
> xen: events: Make round-robin scan fairer by snapshotting each l2 word once only
> xen: events: Clean up round-robin evtchn scan.
> xen: events: Make last processed event channel a per-cpu variable.
> xen: events: Process event channels notifications in round-robin order.
>
> >
> > It might relate to CPU schedule, btw, my xen is 4.0.1.
> >
> > Any comments?
> >
> >
>
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> < BR>

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