Date: Sat, 2 Jun 2007 18:21:46 +0300
From: Muli Ben-Yehuda <muli@il.ibm.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Rik van Riel <riel@redhat.com>, Andrew Vasquez <andrew.vasquez@qlogic.com>,
       Christoph Hellwig <hch@infradead.org>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] quiet down swiotlb warnings
Message-ID: <20070602152146.GE4342@rhun.haifa.ibm.com>
References: <466057B1.9090309@redhat.com> <p73odjzbism.fsf@bingen.suse.de> <20070601181225.GA16460@infradead.org> <20070601193703.GI7217@one.firstfloor.org> <466075D1.8080807@redhat.com> <20070601194734.GJ7217@one.firstfloor.org> <20070601200049.GK12143@andrew-vasquezs-computer.local> <20070601201444.GK7217@one.firstfloor.org> <46607F96.7060200@redhat.com> <20070601202601.GM7217@one.firstfloor.org>
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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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