Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752906AbZC2I1i (ORCPT ); Sun, 29 Mar 2009 04:27:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753154AbZC2I1S (ORCPT ); Sun, 29 Mar 2009 04:27:18 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:37127 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752400AbZC2I1Q (ORCPT ); Sun, 29 Mar 2009 04:27:16 -0400 Date: Sun, 29 Mar 2009 04:25:57 -0400 From: Christoph Hellwig To: Jeff Garzik Cc: Christoph Hellwig , Theodore Tso , Jens Axboe , Linus Torvalds , 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 Message-ID: <20090329082557.GB4242@infradead.org> References: <49C93AB0.6070300@garzik.org> <20090325093913.GJ27476@kernel.dk> <49CA86BD.6060205@garzik.org> <20090325194341.GB27476@kernel.dk> <49CA9346.6040108@garzik.org> <20090327075723.GT27476@kernel.dk> <20090327141333.GS6239@mit.edu> <20090327143543.GA17541@infradead.org> <49CD394B.9080903@garzik.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <49CD394B.9080903@garzik.org> User-Agent: Mutt/1.5.18 (2008-05-17) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 748 Lines: 15 On Fri, Mar 27, 2009 at 04:38:35PM -0400, Jeff Garzik wrote: > At the very least, IMO the block layer should be able to notice when > barriers need not be translated into cache flushes. Most notably when > wb cache is disabled on the drive, something easy to auto-detect, but > probably a manual switch also, for people with enterprise battery-backed > storage and such. Yeah, that's why I suggested to have the tuning knob in the block layer and not in the fses when this came up last time. -- 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/