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xen-devel
RE: [Xen-devel] Too much VCPUS makes domU high CPU utiliazation
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To: |
MaoXiaoyun <tinnycloud@xxxxxxxxxxx>, xen devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] Too much VCPUS makes domU high CPU utiliazation |
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From: |
"Tian, Kevin" <kevin.tian@xxxxxxxxx> |
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Date: |
Sun, 22 May 2011 10:05:11 +0800 |
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"george.dunlap@xxxxxxxxxxxxx" <george.dunlap@xxxxxxxxxxxxx> |
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[Xen-devel] Too much VCPUS makes domU high CPU utiliazation |
>From: MaoXiaoyun [mailto:tinnycloud@xxxxxxxxxxx]
>Sent: Friday, May 20, 2011 11:52 PM
>>
>> >Another strang thing is seems all VCPUS of domainUA, are running only on
>> >even number Physicals CPUS(that is 0, 2,4...),
>> >where explains where CPU Util is 800%. But I don't understand whether this
>> >is designed to.
>>
>> Are there any hard limitation you added from the configuration file? Or do
>> you
>> observe this weird affinity all the time or occasionally? It looks strange
>> to me
>> that scheduler will consistently keep such affinity if you don't assign it
>> explicitly.
>>
>In fact I have twn machine for test, M1 and M2, for now, the issue only show
>M1.
>I think I have no special configuration.After I compare the "xm info" of M1
>and M2, I found
>that M1 has two nr_nodes while M2 only have one.
>This may explain where either all DomUA VCPUS all on even number of Physical
>CPUs.
> And also, this might cause guest slow booting.
>What do u think of this?
>
do you enable NUMA on M1, which may be the reason for the affinity? Could you
post the
cpu topology of M1 which may prove this point?
Thanks
Kevin
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