Messages in this thread |  | | | Subject | Re: pci_map_sg() does not coalesce adjacent physical memory? x86 | | From | James Bottomley <> | | Date | Tue, 18 Nov 2008 14:21:29 +0900 |
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
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