linux-kernel - Re: [LKP] [sched/numa] a43455a1d57: +94.1% proc-vmstat.numa_hint_faults

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Date:	Sat, 02 Aug 2014 07:28:53 +0200
From:	Jirka Hladky <jhladky@...hat.com>
To:	Rik van Riel <riel@...hat.com>, Davidlohr Bueso <davidlohr@...com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Aaron Lu <aaron.lu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org,
	Hai Huang <hhuang@...hat.com>,
	Kamil Kolakowski <kkolakow@...hat.com>
Subject: Re: [LKP] [sched/numa] a43455a1d57: +94.1% proc-vmstat.numa_hint_faults_local

On 08/02/2014 06:17 AM, Rik van Riel wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 08/01/2014 05:30 PM, Jirka Hladky wrote:
>
>> I see the regression only on this box. It has 4 "Ivy Bridge-EX"
>> Xeon E7-4890 v2 CPUs.
>>
>> http://ark.intel.com/products/75251
>> http://en.wikipedia.org/wiki/List_of_Intel_Xeon_microprocessors#.22Ivy_Bridge-EX.22_.2822_nm.29_Expandable_2
>>
>>
>>
>> Please rerun the test on box with Ivy Bridge CPUs. It seems that
>> older CPU generations are not affected.
> That would have been good info to know :)
>
> I've been spending about a month trying to reproduce your issue on a
> Westmere E7-4860.
>
> Good thing I found all kinds of other scheduler issues along the way...

Hi Rik,

till recently I have seen the regression on all systems.

With the latest kernel, only Ivy Bridge system seems to be affected.

Jirka

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