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From: "George Spelvin" <linux@horizon.com>
To: linux@horizon.com, htejun@gmail.com
Cc: Shane.Huang@amd.com, mdnelson8@gmail.com,
	linux-ide@vger.kernel.org, jgarzik@redhat.com,
	grundler@google.com
Subject: Re: What's the SB600 64-bit DMA problem?
Date: Sun, 28 Sep 2008 17:04:22 -0400	[thread overview]
Message-ID: <20080928210422.2578.qmail@science.horizon.com> (raw)
In-Reply-To: <48DCEC6D.1040305@gmail.com>

Tejun Heo <htejun@gmail.com> wrote:
>> Q: Does the fact that I'm using the GART IOMMU mean that I'm not really using
>> using 64-bit DMA at all?
>
> Can you turn it off and see what happens?

I can if I can verify that every other bus-master PCI device in the
system can do 64-bit DMA.

Do you know how to check that?  I haven't found a file under /sys or
/proc that tells me what the DMA masks are of various system
drivers, but that doesn't mean that it doesn't exist.

Thanks.

  reply	other threads:[~2008-09-28 21:04 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-20 15:17 What's the SB600 64-bit DMA problem? George Spelvin
2008-09-20 22:28 ` Grant Grundler
2008-09-21  0:15   ` George Spelvin
2008-09-24  0:30     ` Mark Nelson
2008-09-24  9:46       ` Tejun Heo
2008-09-24 10:19         ` Huang, Shane
2008-09-25  3:24           ` George Spelvin
2008-09-26 14:06             ` Tejun Heo
2008-09-28 21:04               ` George Spelvin [this message]
2008-09-28 23:20                 ` Tejun Heo
2008-09-29  4:08                   ` George Spelvin
2008-09-29  4:25                     ` Tejun Heo
2008-09-30  2:00                       ` George Spelvin
2008-10-01  3:57                         ` Tejun Heo
2008-10-01 13:26                           ` George Spelvin
2008-09-26 16:04             ` Grant Grundler

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