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SubjectRe: [LKP] [sched/numa] a43455a1d57: +94.1% proc-vmstat.numa_hint_faults_local
On 07/31/2014 05:57 PM, Peter Zijlstra wrote:
> On Thu, Jul 31, 2014 at 12:42:41PM +0200, Peter Zijlstra wrote:
>> On Tue, Jul 29, 2014 at 02:39:40AM -0400, Rik van Riel wrote:
>>> On Tue, 29 Jul 2014 13:24:05 +0800
>>> Aaron Lu <aaron.lu@intel.com> wrote:
>>>
>>>> FYI, we noticed the below changes on
>>>>
>>>> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
>>>> commit a43455a1d572daf7b730fe12eb747d1e17411365 ("sched/numa: Ensure task_numa_migrate() checks the preferred node")
>>>>
>>>> ebe06187bf2aec1 a43455a1d572daf7b730fe12e
>>>> --------------- -------------------------
>>>> 94500 ~ 3% +115.6% 203711 ~ 6% ivb42/hackbench/50%-threads-pipe
>>>> 67745 ~ 4% +64.1% 111174 ~ 5% lkp-snb01/hackbench/50%-threads-socket
>>>> 162245 ~ 3% +94.1% 314885 ~ 6% TOTAL proc-vmstat.numa_hint_faults_local
>>> Hi Aaron,
>>>
>>> Jirka Hladky has reported a regression with that changeset as
>>> well, and I have already spent some time debugging the issue.
>> Let me see if I can still find my SPECjbb2005 copy to see what that
>> does.
> Jirka, what kind of setup were you seeing SPECjbb regressions?
>
> I'm not seeing any on 2 sockets with a single SPECjbb instance, I'll go
> check one instance per socket now.
>
>
Peter, I'm seeing regressions for

SINGLE SPECjbb instance for number of warehouses being the same as total
number of cores in the box.

Example: 4 NUMA node box, each CPU has 6 cores => biggest regression is
for 24 warehouses.

See the attached snapshot.

Jirka
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