Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758471AbZCYU2Y (ORCPT ); Wed, 25 Mar 2009 16:28:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757212AbZCYU2F (ORCPT ); Wed, 25 Mar 2009 16:28:05 -0400 Received: from mx2.redhat.com ([66.187.237.31]:46191 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756757AbZCYU2E (ORCPT ); Wed, 25 Mar 2009 16:28:04 -0400 Message-ID: <49CA9324.6010407@redhat.com> Date: Wed, 25 Mar 2009 16:25:08 -0400 From: Ric Wheeler User-Agent: Thunderbird 2.0.0.21 (X11/20090320) MIME-Version: 1.0 To: Jeff Garzik , James Bottomley CC: Ric Wheeler , Jens Axboe , Linus Torvalds , Theodore Tso , Ingo Molnar , Alan Cox , Arjan van de Ven , Andrew Morton , Peter Zijlstra , Nick Piggin , David Rees , Jesper Krogh , Linux Kernel Mailing List Subject: Re: Linux 2.6.29 References: <20090324093245.GA22483@elte.hu> <20090324101011.6555a0b9@lxorguk.ukuu.org.uk> <20090324103111.GA26691@elte.hu> <20090324132032.GK5814@mit.edu> <20090324184549.GE32307@mit.edu> <49C93AB0.6070300@garzik.org> <20090325093913.GJ27476@kernel.dk> <49CA86BD.6060205@garzik.org> <20090325194341.GB27476@kernel.dk> <49CA8ADA.3040709@redhat.com> <49CA9114.3040205@garzik.org> In-Reply-To: <49CA9114.3040205@garzik.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 860 Lines: 26 Jeff Garzik wrote: > Ric Wheeler wrote:> And, as I am sure that you do know, to add insult > to injury, FLUSH_CACHE >> is per device (not file system). >> >> When you issue an fsync() on a disk with multiple partitions, you >> will flush the data for all of its partitions from the write cache.... > > SCSI'S SYNCHRONIZE CACHE command already accepts an (LBA, length) > pair. We could make use of that. > > And I bet we could convince T13 to add FLUSH CACHE RANGE, if we could > demonstrate clear benefit. > > Jeff How well supported is this in SCSI? Can we try it out with a commodity SAS drive? Ric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/