linux-kernel - Re: [PATCH v2] locking/rwsem: Add reader-owned state to the owner field

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Date:	Sat, 7 May 2016 06:56:36 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Waiman Long <Waiman.Long@....com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Davidlohr Bueso <dave@...olabs.net>,
	Jason Low <jason.low2@...com>,
	Dave Chinner <david@...morbit.com>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>
Subject: Re: [PATCH v2] locking/rwsem: Add reader-owned state to the owner
 field


* Waiman Long <Waiman.Long@....com> wrote:

> On a 4-socket Haswell machine running on a 4.6-rc1 based kernel, the
> fio test with multithreaded randrw and randwrite tests on the same
> file on a XFS partition on top of a NVDIMM were run, the aggregated
> bandwidths before and after the patch were as follows:
> 
>   Test      BW before patch     BW after patch  % change
>   ----      ---------------     --------------  --------
>   randrw         988 MB/s          1192 MB/s      +21%
>   randwrite     1513 MB/s          1623 MB/s      +7.3%

What testcase/suite is this? I'd like to run this on other machines as well.

Thanks,

	Ingo