linux-kernel - Re: [PATCH 0/4] ipc/sem.c: Bug fixes, regression fixes, v3

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Date:	Tue, 28 May 2013 13:37:46 -0700
From:	Davidlohr Bueso <davidlohr.bueso@...com>
To:	Manfred Spraul <manfred@...orfullife.com>
Cc:	Rik van Riel <riel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, hhuang@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 0/4] ipc/sem.c: Bug fixes, regression fixes, v3

*sigh* it seems that the email this morning wasn't sent, resending...

On Mon, 2013-05-27 at 17:57 +0200, Manfred Spraul wrote:
> Hi Davidlohr,
> 
> On 05/26/2013 10:50 PM, Davidlohr Bueso wrote:
> >
> > In lack of getting my swingbench DSS environment back, I ran these
> > changes against the semop-multi program on my laptop. For 256 threads,
> > with Manfred's patchset the ops/sec suffers around -7.3%.
> 
> Could you also check the performance of only patch#1?
> I fear that it might be slower than all 4 together.

Performance wise, patch 1 actually doesn't make any difference with what
was already upstream.

> 
> With regards to semop-multi:
> Is this the tool?
> http://marc.info/?l=linux-kernel&m=136208613626892&q=p3

Yep.

Thanks,
Davidlohr

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