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Date: Sat, 15 Jan 2005 14:49:22 +0100
From: Ingo Molnar <mingo@elte.hu>
To: "Jack O'Quin" <joq@io.com>
Cc: Chris Wright <chrisw@osdl.org>, Matt Mackall <mpm@selenic.com>,
       Paul Davis <paul@linuxaudiosystems.com>,
       Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@osdl.org>,
       Lee Revell <rlrevell@joe-job.com>, arjanv@redhat.com,
       alan@lxorguk.ukuu.org.uk, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [request for inclusion] Realtime LSM
Message-ID: <20050115134922.GA10114@elte.hu>
References: <20050110212019.GG2995@waste.org> <200501111305.j0BD58U2000483@localhost.localdomain> <20050111191701.GT2940@waste.org> <20050111125008.K10567@build.pdx.osdl.net> <20050111205809.GB21308@elte.hu> <20050111131400.L10567@build.pdx.osdl.net> <20050111212719.GA23477@elte.hu> <87fz15j325.fsf@sulphur.joq.us>
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* Jack O'Quin <joq@io.com> wrote:

> OK, I reran with just 5 processes reniced from -10 to -5.  On my
> system they were: events, khelper, kblockd, aio and reiserfs.  In
> addition, I reniced loop0 from -20 to -5.

> One major problem: this `nice --20' hack affects every thread, not
> just the critical realtime ones.  That's not what we want.  Audio
> applications make very conscious choices which threads run with high
> priority and which do not.

how much did this problem affect your test? Could the source of the 500
msec delays be the non-highprio components of the test that somehow
became nice --20?

	Ingo