From: Mel Gorman <mgorman@suse.de>
To: lkp@lists.01.org
Subject: Re: [mm] b191f9b106e: -8.8% netperf.time.minor_page_faults
Date: Wed, 01 Apr 2015 08:35:57 +0100 [thread overview]
Message-ID: <20150401073557.GB3921@suse.de> (raw)
In-Reply-To: <1427858614.17170.102.camel@intel.com>
[-- Attachment #1: Type: text/plain, Size: 1073 bytes --]
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.
WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@suse.de>
To: Huang Ying <ying.huang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>, LKP ML <lkp@01.org>
Subject: Re: [LKP] [mm] b191f9b106e: -8.8% netperf.time.minor_page_faults
Date: Wed, 1 Apr 2015 08:35:57 +0100 [thread overview]
Message-ID: <20150401073557.GB3921@suse.de> (raw)
In-Reply-To: <1427858614.17170.102.camel@intel.com>
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.
next prev parent reply other threads:[~2015-04-01 7:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-01 3:23 [mm] b191f9b106e: -8.8% netperf.time.minor_page_faults Huang Ying
2015-04-01 3:23 ` [LKP] " Huang Ying
2015-04-01 7:35 ` Mel Gorman [this message]
2015-04-01 7:35 ` Mel Gorman
2015-04-09 6:20 ` huang ying
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