From: "Lee Revell" <rlrevell@joe-job.com>
To: "Kevin Perros" <kevin.perros@free.fr>
Cc: John <linux.kernel@free.fr>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically
Date: Thu, 29 Mar 2007 15:31:35 -0400 [thread overview]
Message-ID: <75b66ecd0703291231n1b7cbcfcpbb16f4cfee933c2c@mail.gmail.com> (raw)
In-Reply-To: <460C094C.8070304@free.fr>
On 3/29/07, Kevin Perros <kevin.perros@free.fr> wrote:
> > No it is an "indutrial" motherboard.
> > Although I don't know what makes it "industrial".
> >
> > Regards.
> >
> > Is this related to SMM?
> >
> > As far as I can tell, the BIOS is Phoenix AwardBIOS v6.00PG.
> >
> > Would someone know how to disable SMM in this BIOS?
>
> Usually you cannot disable SMM via the BIOS. You have to write chipset
> specific Kernel code for that.
The problem could also be something other than SMM, like DMA
starvation by a video or disk controller. Try disabling all hard
drive controllers and booting from a CD or USB stick.
Also, try tweaking the expire_centisecs and writeback_centisecs values
in /proc/sys/vm and see if it changes the period of the glitches.
Lee
next prev parent reply other threads:[~2007-03-29 19:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-27 16:32 John
2007-03-27 20:41 ` Lee Revell
2007-03-28 8:38 ` John
2007-03-28 16:16 ` Lee Revell
2007-03-29 13:04 ` John
2007-03-29 18:45 ` Kevin Perros
2007-03-29 19:31 ` Lee Revell [this message]
2007-03-29 21:33 ` Alan Cox
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