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

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Date:	Sat, 02 Aug 2014 00:17:05 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Jirka Hladky <jhladky@...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>
Subject: Re: [LKP] [sched/numa] a43455a1d57: +94.1% proc-vmstat.numa_hint_faults_local

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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...

- -- 
All rights reversed
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