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

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Date:	Sat, 7 May 2016 23:04:12 -0400
From:	Waiman Long <waiman.long@....com>
To:	Ingo Molnar <mingo@...nel.org>
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

On 05/07/2016 12:56 AM, Ingo Molnar wrote:
> * 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

I just used fio on a nvdimm based xfs filesystem. It is essentially like 
a ramfs filesystem in term of performance. Attached were config files 
that I used.

Cheers,
Longman

View attachment "rw.fio" of type "text/plain" (420 bytes)

View attachment "wo.fio" of type "text/plain" (427 bytes)