linux-kernel - Re: Pb with simultaneous SATA and ALSA I/O

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Date:	Tue, 26 Sep 2006 16:29:39 +0200
From:	Thierry Vignaud <tvignaud@...driva.com>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Dominique Dumont <domi.dumont@...e.fr>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	alsa-user <alsa-user@...ts.sourceforge.net>
Subject: Re: Pb with simultaneous SATA and ALSA I/O

Lee Revell <rlrevell@...-job.com> writes:

> > Well i agree with the suggestion of trying a different PCI slot
> > for the sb live.  There is so much onboard stuff sharing
> > interrupts on those boards that you might have problems because of
> > that.  Creative cards are not very good at dealing with anything
> > other than ideal conditions from what I have gathered over the
> > years.  The manual for the board will tell you which IRQ goes to
> > which slot, and I guess you want to avoid using a slot that shares
> > with the SATA controller.
> 
> It might not be interrupt related, it could be DMA starvation.  This
> has been observed with some SATA controllers while testing the -rt
> patches.  The symptom is that the latency traces show the machine
> going in "slow motion".

with the -rt patch, high resolution timer + dyn helps too in going in
deep slow mode.
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