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From: "Christopher B. Liebman" <liebman@sponsera.com>
To: "Jens Axboe" <axboe@suse.de>,
	"Mark Hahn" <hahn@coffee.psychology.mcmaster.ca>
Cc: "Acpi@Phobos. Fachschaften. Tu-Muenchen. De" 
	<acpi@phobos.fachschaften.tu-muenchen.de>,
	<linux-kernel@vger.kernel.org>, <alan@lxorguk.ukuu.org.uk>,
	<andre@linux-ide.org>
Subject: RE: [patch]: ide dma timeout retry in pio
Date: Mon, 28 May 2001 16:13:15 -0400	[thread overview]
Message-ID: <EAEOIAEILFNMCKKHDGFGEEBNCAAA.liebman@sponsera.com> (raw)
In-Reply-To: <Pine.LNX.4.10.10105281533400.25183-100000@coffee.psychology.mcmaster.ca>

I think that this may be an issue with ACPI processor power saving...  I
have documented issues with ide DMA timeouts when the processor is put into
the C3 power state.  One of the things that happens in this state is that
buss master arbitration is *disabled*.....  bus master activity is
*supposed* to transition the system back to a C0 power state.  I'll bet
there are some issues with the Linux IDE dma and disabling bus master
arbitration......  ideas?  thoughts?  patches? ;-)

	-- Chris

> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org
> [mailto:linux-kernel-owner@vger.kernel.org]On Behalf Of Mark Hahn
>
> I seem to recall Andre saying that the problem arises when the
> ide DMA engine looses PCI arbitration during a burst.  shorter
> bursts would seem like the best workaround if this is the problem...
>


  reply	other threads:[~2001-05-28 20:14 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-05-28 18:34 Jens Axboe
2001-05-28 19:39 ` Mark Hahn
2001-05-28 20:13   ` Christopher B. Liebman [this message]
2001-05-28 20:37   ` Jens Axboe
2001-05-28 22:15     ` Andre Hedrick
2001-05-28 22:26       ` Jens Axboe
2001-05-29  0:09         ` Andre Hedrick
2001-05-29  0:30           ` Jens Axboe
2001-05-28 21:12   ` Alan Cox
2001-05-28 22:11     ` James Turinsky
2001-05-29  6:18     ` Larry McVoy
2001-05-28 22:20       ` Alan Cox
2001-05-28 22:56       ` Meelis Roos
2001-05-29  7:11         ` Larry McVoy
2001-05-30 21:09 Diefenbaugh, Paul S

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