Re: pci_map_sg() does not coalesce adjacent physical memory? x86

[James Bottomley]

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@xxxxxxxxx> 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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