From: Roland Dreier <rdreier@cisco.com>
To: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Cc: Keir Fraser <keir@xensource.com>,
xen-devel@lists.xensource.com,
"Michael S. Tsirkin" <mst@dev.mellanox.co.il>,
general@lists.openfabrics.org
Subject: [ofa-general] Re: mthca use of dma_sync_single is bogus
Date: Tue, 10 Jul 2007 12:08:43 -0700 [thread overview]
Message-ID: <adak5t89iv8.fsf@cisco.com> (raw)
In-Reply-To: <20070710190018.GK3885@ics.muni.cz> (Lukas Hejtmanek's message of "Tue, 10 Jul 2007 21:00:19 +0200")
> I think he spoke about coherent, didn't he? On i386/x86_64, the consistent and
> coherent are the same but on some architectures they are not and I think that
> using consistent (in particular pci_alloc_consistent) is exactly what should
> be used. Keir also recommended to use this one.
coherent and consistent are synonyms. It's confusing because there is
pci_alloc_consistent(), which is in general just a wrapper for
dma_alloc_coherent().
> And moreover, it avoids using swiotlb and bounce buffers, I think. Am I right,
> Keir?
Yes, but I'm not really willing to make things worse for standard i386
just to make Xen work a little better.
- R.
next prev parent reply other threads:[~2007-07-10 19:08 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-09 21:16 [ofa-general] mthca use of dma_sync_single is bogus Roland Dreier
2007-07-09 21:29 ` Roland Dreier
2007-07-09 21:36 ` Keir Fraser
2007-07-09 21:31 ` [ofa-general] " Keir Fraser
2007-07-09 21:31 ` Roland Dreier
2007-07-09 21:39 ` Michael S. Tsirkin
2007-07-10 6:48 ` Roland Dreier
2007-07-10 7:15 ` Michael S. Tsirkin
2007-07-10 15:33 ` Roland Dreier
2007-07-10 17:11 ` Michael S. Tsirkin
2007-07-10 18:09 ` Roland Dreier
2007-07-10 18:30 ` Michael S. Tsirkin
2007-07-10 19:25 ` Roland Dreier
2007-07-18 13:36 ` Michael S. Tsirkin
2007-07-18 15:12 ` Roland Dreier
2007-07-10 14:14 ` Lukas Hejtmanek
2007-07-10 18:06 ` Roland Dreier
2007-07-10 19:00 ` Lukas Hejtmanek
2007-07-10 19:08 ` Roland Dreier [this message]
2007-07-10 19:16 ` Lukas Hejtmanek
2007-07-10 19:24 ` Roland Dreier
2007-07-10 19:36 ` Lukas Hejtmanek
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