From: Tejun Heo <htejun@gmail.com>
To: George Spelvin <linux@horizon.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: Mon, 29 Sep 2008 08:20:12 +0900 [thread overview]
Message-ID: <48E0112C.7010901@gmail.com> (raw)
In-Reply-To: <20080928210422.2578.qmail@science.horizon.com>
George Spelvin wrote:
> 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.
It doesn't really matter. The kernel will bounce buffers as
necessary.
--
tejun
next prev parent reply other threads:[~2008-09-28 23:21 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
2008-09-28 23:20 ` Tejun Heo [this message]
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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