From: Con Kolivas <kernel@kolivas.org>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Subject: Re: [PATCH] sched: Fix adverse effects of NFS client on interactive response
Date: Wed, 4 Jan 2006 23:18:01 +1100
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Cc: Peter Williams <pwil3058@bigpond.net.au>,
       Helge Hafting <helgehaf@aitel.hist.no>,
       Trond Myklebust <trond.myklebust@fys.uio.no>,
       Ingo Molnar <mingo@elte.hu>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <43A8EF87.1080108@bigpond.net.au> <43BB2414.6060400@bigpond.net.au> <20060104094053.GA4577@dmt.cnet>
In-Reply-To: <20060104094053.GA4577@dmt.cnet>
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On Wednesday 04 January 2006 20:40, Marcelo Tosatti wrote:
> We suspected that the TASK_INTERACTIVE() logic in kernel/sched.c would
> be moving some processes directly to the active list, thus starving some
> others. So we set the nice value of all 48 processes to "nice +19" to
> disable TASK_INTERACTIVE() and the starvation is gone. However with +19
> it becomes impossible to use the box interactively while the test runs,
> which is the case with the default "0" nice value.
>
> Are there significant changes between v2.6.11 -> v2.6.14 aimed at fixing
> this problem?

The SCHED_BATCH policy Ingo has implemented should help just such a problem.

Con
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