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SubjectRe: [RFC PATCH 0/4] Gang scheduling in CFS
On 01/04/2012 12:52 PM, Nikunj A Dadhania wrote:
> On Mon, 02 Jan 2012 11:37:22 +0200, Avi Kivity <avi@redhat.com> wrote:
> > On 12/31/2011 04:21 AM, Nikunj A Dadhania wrote:
> > >
> > > GangV2:
> > > 27.45% ebizzy libc-2.12.so [.] __memcpy_ssse3_back
> > > 12.12% ebizzy [kernel.kallsyms] [k] clear_page
> > > 9.22% ebizzy [kernel.kallsyms] [k] __do_page_fault
> > > 6.91% ebizzy [kernel.kallsyms] [k] flush_tlb_others_ipi
> > > 4.06% ebizzy [kernel.kallsyms] [k] get_page_from_freelist
> > > 4.04% ebizzy [kernel.kallsyms] [k] ____pagevec_lru_add
> > >
> > > GangBase:
> > > 45.08% ebizzy [kernel.kallsyms] [k] flush_tlb_others_ipi
> > > 15.38% ebizzy libc-2.12.so [.] __memcpy_ssse3_back
> > > 7.00% ebizzy [kernel.kallsyms] [k] clear_page
> > > 4.88% ebizzy [kernel.kallsyms] [k] __do_page_fault
> >
> > Looping in flush_tlb_others(). Rik, what trace an we run to find out
> > why PLE directed yield isn't working as expected?
> >
> I tried some experiments by adding a pause_loop_exits stat in the
> kvm_vpu_stat.

(that's deprecated, we use tracepoints these days for stats)

> Here are some observation related to Baseline-only(8vm case)
>
> | ple_gap=128 | ple_gap=64 | ple_gap=256 | ple_window=2048
> --------------+-------------+------------+-------------+----------------
> EbzyRecords/s | 2247.50 | 2132.75 | 2086.25 | 1835.62
> PauseExits | 7928154.00 | 6696342.00 | 7365999.00 | 50319582.00
>
> With ple_window = 2048, PauseExits is more than 6times the default case

So it looks like the default is optimal, at least wrt the cases you
tested and your test workload.

--
error compiling committee.c: too many arguments to function



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