From: Alan Cox <alan@redhat.com>
To: Andi Kleen <ak@suse.de>
Cc: Alan Cox <alan@redhat.com>,
torvalds@osdl.org, discuss@x86-64.org, akpm@osdl.org,
markh@osdl.org, linux-scsi@vger.kernel.org, axboe@suse.de
Subject: Re: [PATCH] [29/82] x86_64: Rename IOMMU option, fix help and mark option embedded.
Date: Sun, 25 Jun 2006 15:00:54 -0400 [thread overview]
Message-ID: <20060625190054.GA6570@devserv.devel.redhat.com> (raw)
In-Reply-To: <200606251722.23294.ak@suse.de>
On Sun, Jun 25, 2006 at 05:22:23PM +0200, Andi Kleen wrote:
> > Older aacraid hardware cannot address the 3-4GB range where the iommu
> > remaps pages. As the PCI DMA implementation for the x86-64 is flawed and
> > doesn't support any nice way to deal with this via swiotlb instead the
> > driver handles it internally.
>
> Then you should just force a low bounce pfn < 0xfffffff for the block device -
> then the block layer should use GFP_DMA bouncing.
>From a tiny 16MB DMA pool that can't sustain the required load ? Or has that
bit changed.
Alan
next prev parent reply other threads:[~2006-06-25 19:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-24 0:19 [PATCH] [29/82] x86_64: Rename IOMMU option, fix help and mark option embedded Andi Kleen
2006-06-24 23:14 ` Alan Cox
2006-06-25 15:22 ` Andi Kleen
2006-06-25 19:00 ` Alan Cox [this message]
2006-06-25 19:32 ` Andi Kleen
2006-06-25 22:21 ` Alan Cox
2006-06-26 6:24 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2006-06-26 12:37 Salyzyn, Mark
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