From: Andy Warner <andyw@pobox.com>
To: Brad Campbell <brad@wasp.net.au>
Cc: Andy Warner <andyw@pobox.com>,
linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [SATA] status report, libata-dev queue updated
Date: Fri, 5 Nov 2004 18:06:02 -0600 [thread overview]
Message-ID: <20041105180602.D31715@florence.linkmargin.com> (raw)
In-Reply-To: <418BD814.807@wasp.net.au>; from brad@wasp.net.au on Fri, Nov 05, 2004 at 11:44:20PM +0400
Brad Campbell wrote:
> Andy Warner wrote:
> > Brad Campbell wrote:
> >
> >>[...]
> >>Read that as "I have tried really, really hard to break it and as yet been unable to".
> >
> >
> > Is your system SMP ? I'm actively tracking a problem now with
> > pass-thru behaviour (via /dev/sg* ) on SMP systems.
>
> Nope, sorry. Only lowly UP here.
I can confirm that there is some sort of problem with
PIO and SMP. Either exercising only DMA commands, or booting
with maxcpus=1 avoids the problem. At present, I suspect
the PIO task and/or state machine, but I'm still investigating.
I doubt this problem will occur unless you have concurrent
PIO access to different controllers on an SMP system.
--
andyw@pobox.com
Andy Warner Voice: (612) 801-8549 Fax: (208) 575-5634
next prev parent reply other threads:[~2004-11-06 0:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-05 10:00 [SATA] status report, libata-dev queue updated Jeff Garzik
2004-11-05 19:04 ` Brad Campbell
2004-11-05 19:26 ` Andy Warner
2004-11-05 19:44 ` Brad Campbell
2004-11-06 0:06 ` Andy Warner [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-10-01 4:58 [sata] " Jeff Garzik
2004-10-01 11:55 ` Brad Campbell
2004-10-01 12:38 ` Jesse Stockall
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