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From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Greg KH <gregkh@suse.de>, Rafa? Bilski <rafalbilski@interia.pl>,
	linux-kernel@vger.kernel.org, davej@redhat.com
Subject: Re: [PATCH] (Longhaul 1/5) PCI: Protect bus master DMA from	Longhaul by rw semaphores
Date: Wed, 28 Jun 2006 11:00:23 -0700	[thread overview]
Message-ID: <44A2C3B7.3040400@goop.org> (raw)
In-Reply-To: <1151517780.15166.52.camel@localhost.localdomain>

Alan Cox wrote:
> I am still not clear if this is just cache corruption through us not
> listening or whether we genuinely need to halt.
Especially buggy steppings of C3s would stop snooping while in 'hlt', so 
it wouldn't surprise me if they stopped while doing a speed transition.

>  In the former case
> flushing and disabling the CPU caches ought to be sufficient.
>   
Sounds reasonable, unless that causes problems of its own.  (My general 
experience with Via CPUs is that doing anything even slightly unusual 
will result in strange behaviour or outright buggyness.)

    J

  reply	other threads:[~2006-06-28 18:00 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-06-28 13:56 [PATCH] (Longhaul 1/5) PCI: Protect bus master DMA from Longhaul by rw semaphores Rafał Bilski
2006-06-28 17:34 ` Greg KH
2006-06-28 18:03   ` Alan Cox
2006-06-28 18:00     ` Jeremy Fitzhardinge [this message]
2006-06-28 18:10   ` Dave Jones
  -- strict thread matches above, loose matches on Subject: below --
2006-06-28 18:25 Rafał Bilski
2006-06-29 11:37 ` Alan Cox
2006-06-29 12:03   ` Bart Hartgers
2006-06-29 12:50     ` Rafał Bilski
2006-06-29 14:12     ` Rafał Bilski
2006-06-29 15:01       ` Bart Hartgers
2006-06-29 15:40         ` Rafał Bilski
2006-06-30 10:46           ` Bart Hartgers
2006-06-29 15:16       ` Bart Hartgers
2006-06-29 15:55         ` Alan Cox
2006-06-29 18:54         ` Rafał Bilski
2006-06-29 15:52     ` Alan Cox
     [not found] <fa.lpmuYQxc6OV7Bh11JMM/FzqVWyY@ifi.uio.no>
2006-06-29 23:17 ` Robert Hancock
2006-07-01 18:02   ` Rafał Bilski

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