linux-kernel - Re: [PATCH 0/6] ipc/sem.c: performance improvements, FIFO

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Date:	Sat, 15 Jun 2013 10:36:20 +0200
From:	Mike Galbraith <efault@....de>
To:	Manfred Spraul <manfred@...orfullife.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>, hhuang@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 0/6] ipc/sem.c: performance improvements, FIFO

On Sat, 2013-06-15 at 09:30 +0200, Mike Galbraith wrote:

> Gee, just trying to flip back to a single semaphore lock mode if you had
> to do the global wait thing fixed up -rt.

But master wants a sharper rock tossed at it, it's still unstable.

Result matrix:
  Thread   0: 11190947
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  Thread   3:  9776111
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  Thread   8:  9828587
  Thread   9:  9589199
...

And that's one of the better samples.  Probably -rt sleepy locks help
get us flipped back to single sem lock mode.

Hohum.  On the bright side, -rt gets to scale better than mainline for a
little while, that's kinda different.

-Mike

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