From: Ryan Harper <ryanh@us.ibm.com>
To: "Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@hp.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
xen-devel <xen-devel@lists.xensource.com>,
Orran Krieger <okrieg@us.ibm.com>,
Tristan Gingold <Tristan.Gingold@bull.net>,
xen-ia64-devel@lists.xensource.com
Subject: Re: Does dom0 see all physical processors? (RE: [Xen-ia64-devel] SAL INFO virtualization)
Date: Fri, 7 Apr 2006 10:42:09 -0500 [thread overview]
Message-ID: <20060407154209.GA16776@us.ibm.com> (raw)
In-Reply-To: <516F50407E01324991DD6D07B0531AD5AA8E66@cacexc12.americas.cpqcorp.net>
* Magenheimer, Dan (HP Labs Fort Collins) <dan.magenheimer@hp.com> [2006-04-07 01:43]:
> I understand and sympathize with the need for dom0 to
> sometimes get and use information from each processor
> that is only available if dom0 is running on each processor.
>
> However, AFAIK, SMP guests are always gang-scheduled, correct?
I don't believe either the bvt or sedf scheduler in Xen provide any gang
scheduling support. Each physical cpu has its own runqueue and it
schedules VCPUs independently. The scheduling parameters are set on a
per-domain basis but end up being the same for each VCPU.
--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253 T/L: 678-9253
ryanh@us.ibm.com
next prev parent reply other threads:[~2006-04-07 15:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-04 19:27 Does dom0 see all physical processors? (RE: [Xen-ia64-devel] SAL INFO virtualization) Magenheimer, Dan (HP Labs Fort Collins)
2006-04-07 15:42 ` Ryan Harper [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-04-05 14:32 Does dom0 see all physical processors? (RE:[Xen-ia64-devel] " Ian Pratt
2006-04-05 14:07 Magenheimer, Dan (HP Labs Fort Collins)
2006-04-05 14:20 ` Keir Fraser
2006-04-07 13:55 ` Stephen C. Tweedie
2006-04-04 20:06 Ian Pratt
2006-04-04 7:40 Does dom0 see all physical processors? (RE: [Xen-ia64-devel] " Tian, Kevin
2006-04-04 2:17 Does dom0 see all physical processors? (RE: " Tian, Kevin
2006-04-04 7:26 ` Does dom0 see all physical processors? (RE: [Xen-ia64-devel] " Keir Fraser
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