linux-kernel - Re: 3.6.11 AMD-Vi: Completion-Wait loop timed out

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Message-ID: <20130122151632.GS25591@8bytes.org>
Date:	Tue, 22 Jan 2013 16:16:32 +0100
From:	Jörg Rödel <joro@...tes.org>
To:	Boris Ostrovsky <boris.ostrovsky@....com>
Cc:	Udo van den Heuvel <udovdh@...all.nl>,
	suravee.suthikulpanit@....com, Jacob Shin <jacob.shin@....com>,
	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org
Subject: Re: 3.6.11  AMD-Vi: Completion-Wait loop timed out

On Tue, Jan 22, 2013 at 09:36:34AM -0500, Boris Ostrovsky wrote:
> 
> 
> On 01/22/2013 09:13 AM, Udo van den Heuvel wrote:
> >Gigabyte demonstrate that using ESX 5i IOMMU works fine. (with pictures
> >attached).
> 
> There are no attachments to your message.
> 
> I am not sure that 5i supports IOMMU (but I may well be wrong).

Virtualization use-cases don't change the page-tables for the IOMMU very
often. So there is less need to flush the IO-TLB and IOMMU command
processing is utilized only from time to time.

In Linux however the page-tables change all the time and there is a much
higher load on the IOMMU command buffer which makes it much more likely
to trigger the hardware problem.


	Joerg


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