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Message-ID: <4EF99F3A.6070203@redhat.com> Date: Tue, 27 Dec 2011 12:34:34 +0200 From: Avi Kivity <avi@...hat.com> To: Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com> CC: Ingo Molnar <mingo@...e.hu>, peterz@...radead.org, linux-kernel@...r.kernel.org, vatsa@...ux.vnet.ibm.com, bharata@...ux.vnet.ibm.com Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS On 12/27/2011 12:10 PM, Nikunj A Dadhania wrote: > On Tue, 27 Dec 2011 11:51:46 +0200, Avi Kivity <avi@...hat.com> wrote: > > On 12/27/2011 11:44 AM, Nikunj A Dadhania wrote: > > > > > I am seeing a drop of ~44% when setting yield_on_hlt = 0 > > > > > > > > > > > > > A drop of 44% of what? > > > > > > > records/sec > > > > > > Ebizzy - 2VM running in parallel, both having gang scheduling enabled. > > > > > > yield_on_hlt=1 yield_on_hlt=0 > > > EbzyRecords/sec 41955.50 23285.00 -44 > > > > > > > > > > Interesting, are you overcommitting vcpus? > > > Yes(1:2). On a 8cpu machine, have 2VMs running, which is 8vcpus each. Ah, yield_on_hlt=0 isn't any good with overcommit. The vcpu stays scheduled when idle, so other vcpus don't get to use its cpu time. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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