From: Josh Triplett <josht@linux.vnet.ibm.com>
To: "Sébastien Dugué" <sebastien.dugue@bull.net>
Cc: Linux RT Users <linux-rt-users@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
Jean Pierre Dion <jean-pierre.dion@bull.net>,
Darren Hart <dvhltc@us.ibm.com>,
john stultz <johnstul@us.ibm.com>
Subject: Re: [PATCH RT] Fix RT balancing tasks pulling
Date: Mon, 30 Jul 2007 14:50:34 -0700 [thread overview]
Message-ID: <1185832234.3334.35.camel@josh-work.beaverton.ibm.com> (raw)
In-Reply-To: <20070724154202.224f12e8@frecb000686.frec.bull.fr>
On Tue, 2007-07-24 at 15:42 +0200, Sébastien Dugué wrote:
> this one-liner fixes a bug in balance_rt_tasks() which sometimes manifests by
> having a lower prio task being scheduled while a higher prio task is sitting
> waiting on another runqueue.
>
> This is pretty hard to reproduce on low cpu count machines, for example, I
> had to have sched_football run in a loop for ~38h before it failed on a dual HT
> Xeon box.
Very impressive find, and this does seem to improve things in some
cases.
However, with 2.6.22.1-rt8, which includes this patch, I still managed
to get some failures after a few hours on an 8-way (quad dual-core) box.
Preliminary results so far:
420 Final ball position: 0
2 Final ball position: 1
- Josh Triplett
next prev parent reply other threads:[~2007-07-30 21:50 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-24 13:42 Sébastien Dugué
2007-07-25 7:27 ` Ingo Molnar
2007-07-30 21:50 ` Josh Triplett [this message]
2007-07-31 11:48 ` Sébastien Dugué
2007-08-01 0:18 ` Josh Triplett
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