From: Rik van Riel <riel@conectiva.com.br>
To: Sasha Pachev <sasha@mysql.com>
Cc: Mike Kravetz <mkravetz@sequent.com>, <linux-kernel@vger.kernel.org>
Subject: Re: Strange thread behaviour on 8-way x86 machine
Date: Fri, 6 Jul 2001 17:41:16 -0300 (BRST) [thread overview]
Message-ID: <Pine.LNX.4.33L.0107061740560.17825-100000@duckman.distro.conectiva> (raw)
In-Reply-To: <01070614353314.17811@mysql>
On Fri, 6 Jul 2001, Sasha Pachev wrote:
> On Friday 06 July 2001 13:24, Rik van Riel wrote:
> > On Fri, 6 Jul 2001, Sasha Pachev wrote:
> >
> > > Upon further investigation and testing, it turned out that the kernel was
> not
> > > at fault - the problem was high mutex contention, which caused frequent
> > > context switches, and the idle CPU was apparently from the scheduler
> waiting
> > > for the original CPU to become available too often.
> > >
> > > On a side note, it would be nice if a process could communicate
> > > to the kernel that it would rather run on the first available
> > > CPU than wait for the perfect one to become available.
> >
> > The kernel already does this.
>
> Thanks for the info. Would you mind proving a one line pointer
> on how to tell this to the kernel?
It always does this, by default. AFAIK you cannot turn it off.
Rik
--
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prev parent reply other threads:[~2001-07-06 20:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-03 18:25 Strange thread behaviour on 8-way x86 machine Sasha Pachev
2001-07-03 18:51 ` Mike Kravetz
2001-07-06 18:45 ` Sasha Pachev
2001-07-06 19:24 ` Rik van Riel
2001-07-06 20:35 ` Sasha Pachev
2001-07-06 20:41 ` Rik van Riel [this message]
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