linux-kernel - Re: [PATCH v3 2/7] locking/pvqspinlock: Add pending bit support

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Message-ID: <55B6663B.2060707@hp.com>
Date:	Mon, 27 Jul 2015 13:11:23 -0400
From:	Waiman Long <waiman.long@...com>
To:	Davidlohr Bueso <dave@...olabs.net>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Scott J Norton <scott.norton@...com>,
	Douglas Hatch <doug.hatch@...com>
Subject: Re: [PATCH v3 2/7] locking/pvqspinlock: Add pending bit support

On 07/26/2015 07:09 PM, Davidlohr Bueso wrote:
> On Wed, 2015-07-22 at 16:12 -0400, Waiman Long wrote:
>> Using a locking microbenchmark on the same system, the locking
>> rates in (kops/s) were:
>>
>>    Threads		Rate w/o patch	Rate with patch
>>    -------		--------------	---------------
>>    2 (same socket)	  6,515,265	  7,077,476
>>    2 (diff sockets)	  2,967,145	  4,353,851
> At this level stddev would be nice to have, as these sort of things have
> a lot of variation.
>
> Out of general interest, are these microbenchmarks available? Would you
> care to add something like that to perf-bench? I assume they would
> probably be x86 specific.

Ingo has asked similar question and he suggested doing an user-space 
implementation in perf bench. I will take a further look at that when I 
have time.

Cheers,
Longman
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