From: Muli Ben-Yehuda <muli@il.ibm.com>
To: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jan Beulich <jbeulich@novell.com>,
Tony Luck <tony.luck@intel.com>
Subject: Re: dma_mapping_ops for i386
Date: Wed, 27 Jun 2007 16:28:39 -0400 [thread overview]
Message-ID: <20070627202839.GC4344@rhun.congress.lan> (raw)
In-Reply-To: <200706271726.51013.ak@suse.de>
On Wed, Jun 27, 2007 at 05:26:50PM +0200, Andi Kleen wrote:
> See the recent "quiet down swiotlb warnings" thread which uncovered
> quite some corpses in Xen's current IO setup.
>
> Xen apparently bounces for multi page IOs which get merged from block
> lists because the block layer doesn't know they are not really
> continuous in machine memory.
>
> Proper fix is to tell the block layer to not merge in the first
> place instead.
>
> And probably some similar mechanism for network drivers that limits
> MTUs.
Will that guarantee that block and net IOs will not straddle a page
boundary?
Cheers,
Muli
next prev parent reply other threads:[~2007-06-27 20:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-26 19:59 dma_mapping_ops for i386 Jeremy Fitzhardinge
2007-06-26 22:21 ` Andi Kleen
2007-06-27 14:15 ` Jeremy Fitzhardinge
2007-06-27 15:26 ` Andi Kleen
2007-06-27 18:40 ` Jeremy Fitzhardinge
2007-06-27 20:28 ` Muli Ben-Yehuda [this message]
2007-06-30 18:41 ` Herbert Xu
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