linux-kernel - Re: [mm] f7b5d647946: -3.0% dbench.throughput-MB/sec

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Date:	Tue, 19 Aug 2014 15:34:28 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [mm] f7b5d647946: -3.0% dbench.throughput-MB/sec

On Tue, Aug 19, 2014 at 12:41:34PM +0800, Fengguang Wu wrote:
> Hi Mel,
> 
> We noticed a minor dbench throughput regression on commit
> f7b5d647946aae1647bf5cd26c16b3a793c1ac49 ("mm: page_alloc: abort fair
> zone allocation policy when remotes nodes are encountered").
> 
> testcase: ivb44/dbench/100%
> 
> bb0b6dffa2ccfbd  f7b5d647946aae1647bf5cd26
> ---------------  -------------------------
>      25692 ± 0%      -3.0%      24913 ± 0%  dbench.throughput-MB/sec
>    6974259 ± 6%     -12.1%    6127616 ± 0%  meminfo.DirectMap2M
>      18.43 ± 0%      -4.6%      17.59 ± 0%  turbostat.RAM_W
>       9302 ± 0%      -3.6%       8965 ± 1%  time.user_time
>    1425791 ± 1%      -2.0%    1396598 ± 0%  time.involuntary_context_switches
> 
> Disclaimer:
> Results have been estimated based on internal Intel analysis and are provided
> for informational purposes only. Any difference in system hardware or software
> design or configuration may affect actual performance.
> 

DirectMap2M changing is a major surprise and doesn't make sense for this
machine. Did the amount of memory in the machine change between two
tests?

-- 
Mel Gorman
SUSE Labs
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