From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755011AbXDZUWU (ORCPT ); Thu, 26 Apr 2007 16:22:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1031495AbXDZUWQ (ORCPT ); Thu, 26 Apr 2007 16:22:16 -0400 Received: from calculon.skynet.ie ([193.1.99.88]:60403 "EHLO calculon.skynet.ie" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751975AbXDZUWI (ORCPT ); Thu, 26 Apr 2007 16:22:08 -0400 Date: Thu, 26 Apr 2007 21:22:02 +0100 To: Jens Axboe 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: <20070426202202.GI16909@skynet.ie> References: <20070426161152.GC16337@infradead.org> <20070426180358.GG2017@kernel.dk> <20070426180932.GA10642@infradead.org> <20070426181249.GH2017@kernel.dk> <20070426182945.GJ2017@kernel.dk> <20070426183935.GK2017@kernel.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20070426183935.GK2017@kernel.dk> User-Agent: Mutt/1.5.9i From: mel@skynet.ie (Mel Gorman) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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. -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab