Message-ID: <1371285380.5789.42.camel@marge.simpson.net>
Subject: Re: [PATCH 0/6] ipc/sem.c: performance improvements, FIFO
From: Mike Galbraith <efault@gmx.de>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Rik van Riel <riel@redhat.com>,
        Davidlohr Bueso <davidlohr.bueso@hp.com>, hhuang@redhat.com,
        Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 15 Jun 2013 10:36:20 +0200
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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
  Thread   1: 11743861
  Thread   2: 10039223
  Thread   3:  9776111
  Thread   4:  9734815
  Thread   5:  9941121
  Thread   6: 11604118
  Thread   7: 11716281
  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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