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Date: Tue, 18 Nov 2008 14:21:29 +0900 From: James Bottomley <James.Bottomley@...senPartnership.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Leon Woestenberg <leon.woestenberg@...il.com>, LKML <linux-kernel@...r.kernel.org>, FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>, Tejun Heo <tj@...nel.org> Subject: Re: pci_map_sg() does not coalesce adjacent physical memory? x86 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@...il.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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