linux-kernel - RE: Linux 3.8-rc4

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Date:	Tue, 22 Jan 2013 16:36:35 +0000
From:	"Deucher, Alexander" <Alexander.Deucher@....com>
To:	Shuah Khan <shuahkhan@...il.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: Linux 3.8-rc4

> -----Original Message-----
> From: Shuah Khan [mailto:shuahkhan@...il.com]
> Sent: Tuesday, January 22, 2013 11:15 AM
> To: Deucher, Alexander
> Cc: Linus Torvalds; Linux Kernel Mailing List
> Subject: Re: Linux 3.8-rc4
> 
> On Sat, Jan 19, 2013 at 9:44 AM, Deucher, Alexander
> <Alexander.Deucher@....com> wrote:
> >> -----Original Message-----
> >> From: Shuah Khan [mailto:shuahkhan@...il.com]
> >> Sent: Friday, January 18, 2013 7:40 PM
> >> To: Linus Torvalds; Deucher, Alexander
> >> Cc: Linux Kernel Mailing List
> >> Subject: Re: Linux 3.8-rc4
> >>
> >> On Fri, Jan 18, 2013 at 3:37 PM, Shuah Khan <shuahkhan@...il.com>
> wrote:
> >> > On Fri, Jan 18, 2013 at 10:51 AM, Shuah Khan <shuahkhan@...il.com>
> >> wrote:
> >>
> >> >
> >> > ok. I bisected the DMAR faults and it points to the following commit:
> >> >
> >> > 909d9eb67f1e4e39f2ea88e96bde03d560cde3eb
> >> >
> >> > This commit as I recall, fixed the crash problem I was seeing back in
> >> > 3.8-rc1. Reverting to see if crash problem reappears.
> >>
> >> Confirming that with this commit reverted crash problem re-appeared.
> >> With this commit, DMAR faults show up.
> >
> > I'm not quite sure what's going on with your system.   At this point it's
> probably best to just disable the DMA ring on these cards until we sort out
> what's going on.  The attached patch disables the use of the DMA ring.  Let
> me know if it fixes the issues you are seeing.
> >
> 
> I applied this patch to 3.8-rc4 and didn't fix the DMAR faults.

Are you getting continuous DMAR faults or just when while the module is being loaded?

Alex



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