* PV kernel boot parameter maxcpus has no effect?
@ 2010-04-28 3:07 Yuyang Du
2010-04-28 6:32 ` Pasi Kärkkäinen
0 siblings, 1 reply; 3+ messages in thread
From: Yuyang Du @ 2010-04-28 3:07 UTC (permalink / raw)
To: xen-devel
Hi all,
I have a two-socket (each socket processor has 4 cores) machine, but only want to use one socket processor. I give pv dom0 boot parameter maxcpus=4, but in fact there is no effect, other cpus 4-7 are still used. Is this a bug or something?
Shawn
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: PV kernel boot parameter maxcpus has no effect?
@ 2010-04-28 7:22 Jan Beulich
0 siblings, 0 replies; 3+ messages in thread
From: Jan Beulich @ 2010-04-28 7:22 UTC (permalink / raw)
To: duyuyang, pasik; +Cc: xen-devel
>>> Pasi Kärkkäinen 04/28/10 8:33 AM >>>
>On Wed, Apr 28, 2010 at 11:07:36AM +0800, Yuyang Du wrote:
>> Hi all,
>>
>> I have a two-socket (each socket processor has 4 cores) machine, but only want to use one socket processor. I give pv
dom0 boot parameter maxcpus=4, but in fact there is no effect, other cpus 4-7 are still used. Is this a bug or
something?
>>
>
>You need to give _Xen_ (xen.gz) option dom0_max_vcpus=X
Yes and no - the other scenario also has its use case (i.e. have Dom0 initially just bring up a subset of the vCPU-s it
has been given).
However, given that the bringing up of secondary CPUs happens from common (even arch-independent) code, the whole issue
seems a little suspicious - namely what indication he uses to see that there are more than 4 vCPU-s in use by Dom0.
Jan
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2010-04-28 3:07 PV kernel boot parameter maxcpus has no effect? Yuyang Du
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2010-04-28 7:22 Jan Beulich
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