From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Leon Woestenberg <leon.woestenberg@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
Tejun Heo <tj@kernel.org>
Subject: Re: pci_map_sg() does not coalesce adjacent physical memory? x86
Date: Tue, 18 Nov 2008 14:21:29 +0900 [thread overview]
Message-ID: <1226985689.3403.20.camel@localhost.localdomain> (raw)
In-Reply-To: <20081117191532.c1c849f5.akpm@linux-foundation.org>
On Mon, 2008-11-17 at 19:15 -0800, Andrew Morton wrote:
> (cc's added)
>
> On Mon, 17 Nov 2008 22:54:33 +0100 "Leon Woestenberg" <leon.woestenberg@gmail.com> wrote:
>
> > Hello,
> >
> > pci_map_sg() does not coalesce the scattergather list for me on x86.
>
> In which kernel version(s)?
Also which driver? Some manually disable physical merging, so they will
never coalesce adjacent pages.
You need the flag QUEUE_FLAG_CLUSTER set for physical merging to take
place.
James
next prev parent reply other threads:[~2008-11-18 5:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-17 21:54 pci_map_sg() does not coalesce adjacent physical memory? x86 Leon Woestenberg
2008-11-18 3:15 ` Andrew Morton
2008-11-18 5:21 ` James Bottomley [this message]
2008-11-18 9:37 ` Leon Woestenberg
2008-11-19 5:19 ` FUJITA Tomonori
2008-11-19 6:22 ` Leon Woestenberg
2008-11-19 6:58 ` FUJITA Tomonori
2008-11-19 7:05 ` FUJITA Tomonori
2008-11-19 7:58 ` FUJITA Tomonori
2008-11-19 9:45 ` Leon Woestenberg
2008-11-19 10:05 ` Tejun Heo
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