From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 3 Jan 2008 22:23:58 +0000 From: Alan Cox Subject: Re: [patch] i386: avoid expensive ppro ordering workaround for default 686 kernels Message-ID: <20080103222358.3632785d@lxorguk.ukuu.org.uk> In-Reply-To: <1199391643.7291.15.camel@pasglop> References: <20071218012632.GA23110@wotan.suse.de> <20071222005737.2675c33b.akpm@linux-foundation.org> <20071223055730.GA29288@wotan.suse.de> <20071222223234.7f0fbd8a.akpm@linux-foundation.org> <20071223071529.GC29288@wotan.suse.de> <20080101234133.4a744329@the-village.bc.nu> <20080102110225.GA16154@wotan.suse.de> <20080102134433.6ca82011@the-village.bc.nu> <20080103041708.GB26487@wotan.suse.de> <20080103142330.111d4067@lxorguk.ukuu.org.uk> <1199391643.7291.15.camel@pasglop> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: benh@kernel.crashing.org Cc: Nick Piggin , Linus Torvalds , Andrew Morton , Hugh Dickins , Linux Memory Management List List-ID: On Fri, 04 Jan 2008 07:20:43 +1100 > > Whether that actually matters in any code we have I don't know. > > It matters with writes to MMIO at least, I don't know if your PPro bug > can cause that to be re-ordered tho. In certain cases yes - the 3Dfx Voodoo cards were particularly good at triggering it as they map the command registers cleverly to get bursts. -- 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