From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-we0-f169.google.com (mail-we0-f169.google.com [74.125.82.169]) by kanga.kvack.org (Postfix) with ESMTP id 5417A6B0069 for ; Wed, 22 Jan 2014 09:11:55 -0500 (EST) Received: by mail-we0-f169.google.com with SMTP id u57so358754wes.28 for ; Wed, 22 Jan 2014 06:11:54 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTP id cm11si6786621wjb.17.2014.01.22.06.11.39 for ; Wed, 22 Jan 2014 06:11:40 -0800 (PST) Message-ID: <52DFD168.8080001@redhat.com> Date: Wed, 22 Jan 2014 09:10:48 -0500 From: Ric Wheeler MIME-Version: 1.0 Subject: Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going beyond 4096 bytes References: <20131220093022.GV11295@suse.de> <52DF353D.6050300@redhat.com> <20140122093435.GS4963@suse.de> In-Reply-To: <20140122093435.GS4963@suse.de> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, lsf-pc@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Andrew Morton On 01/22/2014 04:34 AM, Mel Gorman wrote: > On Tue, Jan 21, 2014 at 10:04:29PM -0500, Ric Wheeler wrote: >> One topic that has been lurking forever at the edges is the current >> 4k limitation for file system block sizes. Some devices in >> production today and others coming soon have larger sectors and it >> would be interesting to see if it is time to poke at this topic >> again. >> > Large block support was proposed years ago by Christoph Lameter > (http://lwn.net/Articles/232757/). I think I was just getting started > in the community at the time so I do not recall any of the details. I do > believe it motivated an alternative by Nick Piggin called fsblock though > (http://lwn.net/Articles/321390/). At the very least it would be nice to > know why neither were never merged for those of us that were not around > at the time and who may not have the chance to dive through mailing list > archives between now and March. > > FWIW, I would expect that a show-stopper for any proposal is requiring > high-order allocations to succeed for the system to behave correctly. > I have a somewhat hazy memory of Andrew warning us that touching this code takes us into dark and scary places. ric -- 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