linux-kernel - Re: [LKP] [mm] b191f9b106e: -8.8% netperf.time.minor_page

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Message-ID: <20150401073557.GB3921@suse.de>
Date:	Wed, 1 Apr 2015 08:35:57 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [mm] b191f9b106e: -8.8% netperf.time.minor_page_faults

On Wed, Apr 01, 2015 at 11:23:34AM +0800, Huang Ying wrote:
> FYI, we noticed the below changes on
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> commit b191f9b106ea1a24a711dbebb2925d3313da5852 ("mm: numa: preserve PTE write permissions across a NUMA hinting fault")
> 
> 
> testbox/testcase/testparams: lkp-ne02/netperf/performance-300s-200%-TCP_SENDFILE
> 
> bea66fbd11af1ca9  b191f9b106ea1a24a711dbebb2  
> ----------------  --------------------------  
>          %stddev     %change         %stddev
>              \          |                \  
>      13115 ±  0%      -8.8%      11968 ±  0%  netperf.time.minor_page_faults
>      65.63 ±  6%     -14.6%      56.05 ±  7%  netperf.time.user_time
>      65.63 ±  6%     -14.6%      56.05 ±  7%  time.user_time

Hmmm, is this a positive report? It looks like it -- fewer faults at
least. Lower user_time is ambiguous because the elapsed time is not
included in the report and netperf has variable time depending on
whether it can get a confident result or not.
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