From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with ESMTP id BEB776B0204 for ; Mon, 26 Apr 2010 08:47:07 -0400 (EDT) MIME-Version: 1.0 Message-ID: Date: Mon, 26 Apr 2010 05:45:57 -0700 (PDT) From: Dan Magenheimer Subject: RE: Frontswap [PATCH 0/4] (was Transcendent Memory): overview References: <20100422134249.GA2963@ca-server1.us.oracle.com> <4BD06B31.9050306@redhat.com> <53c81c97-b30f-4081-91a1-7cef1879c6fa@default> <4BD07594.9080905@redhat.com> <4BD16D09.2030803@redhat.com> <4BD1A74A.2050003@redhat.com> <4830bd20-77b7-46c8-994b-8b4fa9a79d27@default> <4BD1B427.9010905@redhat.com> <4BD336CF.1000103@redhat.com> <4BD43182.1040508@redhat.com> <4BD44E74.2020506@redhat.com> <7264e3c0-15fe-4b70-a3d8-2c36a2b934df@default 4BD52C4F.40505@redhat.com> In-Reply-To: <4BD52C4F.40505@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org To: Avi Kivity Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, jeremy@goop.org, hugh.dickins@tiscali.co.uk, ngupta@vflare.org, JBeulich@novell.com, chris.mason@oracle.com, kurt.hackel@oracle.com, dave.mccracken@oracle.com, npiggin@suse.de, akpm@linux-foundation.org, riel@redhat.com List-ID: > dma engines are present on commodity hardware now: >=20 > http://en.wikipedia.org/wiki/I/O_Acceleration_Technology >=20 > I don't know if consumer machines have them, but servers certainly do. > modprobe ioatdma. They don't seem to have gained much ground in the FIVE YEARS since the patch was first posted to Linux, have they? Maybe it's because memory-to-memory copy using a CPU is so fast (especially for page-ish quantities of data) and is a small percentage of CPU utilization these days? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org