From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755355AbXD0FUP (ORCPT ); Fri, 27 Apr 2007 01:20:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755353AbXD0FUP (ORCPT ); Fri, 27 Apr 2007 01:20:15 -0400 Received: from brick.kernel.dk ([80.160.20.94]:1156 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755355AbXD0FUN (ORCPT ); Fri, 27 Apr 2007 01:20:13 -0400 Date: Fri, 27 Apr 2007 07:16:26 +0200 From: Jens Axboe To: Mel Gorman Cc: Christoph Lameter , Christoph Hellwig , "Eric W. Biederman" , Nick Piggin , David Chinner , linux-kernel@vger.kernel.org, William Lee Irwin III , Badari Pulavarty , Maxim Levitsky Subject: Re: [00/17] Large Blocksize Support V3 Message-ID: <20070427051625.GM2017@kernel.dk> References: <20070426180358.GG2017@kernel.dk> <20070426180932.GA10642@infradead.org> <20070426181249.GH2017@kernel.dk> <20070426182945.GJ2017@kernel.dk> <20070426183935.GK2017@kernel.dk> <20070426202202.GI16909@skynet.ie> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070426202202.GI16909@skynet.ie> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 26 2007, Mel Gorman wrote: > On (26/04/07 20:39), Jens Axboe didst pronounce: > > On Thu, Apr 26 2007, Christoph Lameter wrote: > > > On Thu, 26 Apr 2007, Jens Axboe wrote: > > > > > > > On Thu, Apr 26 2007, Christoph Lameter wrote: > > > > > On Thu, 26 Apr 2007, Jens Axboe wrote: > > > > > > > > > > > The above can be implemented fairly cleanly, and on a need-to-have > > > > > > basis. It's not something that'll break drivers. > > > > > > > > > > But its also not going to fix the hacks that we have in the kernel > > > > > to deal with > PAGE_SIZE i/o. > > > > > > > > No, but that's a _seperate_ issue! Don't keep mixing up the two. > > > > > > Yes I understand that you want it to be a separate issue so we get get > > > more rationales for the hacks that we do to avoid the large > > > order allocations. > > > > Christoph, don't take your frustrations out on me. I've several times in > > this thread said that I'd LIKE to have > PAGE_SIZE support in the page > > cache. I WROTE the initial pktcdvd driver that is a primary example of > > these hacks, I'm very well aware of the pain and bugs involved with > > that. > > > > But don't push large pages as the only solution to larger ios, because > > that is trivially not true. > > > > Would it be fair to say that your approach and using large pages are not > mutually exclusive solutions? It seems a lot of the debate here is > assuming there is One And Only One Solution for larger ios. Definitely, there's zero reason they cannot coexist. -- Jens Axboe