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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1226985689.3403.20.camel@localhost.localdomain>
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/