linux-kernel - Re: [PATCH] quiet down swiotlb warnings

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Message-ID: <20070602152146.GE4342@rhun.haifa.ibm.com>
Date:	Sat, 2 Jun 2007 18:21:46 +0300
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] quiet down swiotlb warnings

On Fri, Jun 01, 2007 at 10:26:01PM +0200, Andi Kleen wrote:

> Normally swiotlb doesn't even try to bounce when dma mask is <=
> end_pfn so something must be very wrong in your kernel. It
> definitely isn't a mainline kernel. If this happens in Xen then Xen
> just needs fixing -- it should not try to bounce when the normal
> kernel wouldn't.

Xen needs to bounce when the requested buffer is not contiguous in
machine memory (and indeed uses swiotlb for that).

Cheers,
Muli
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