From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Torvalds Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support) Date: Tue, 18 Sep 2007 18:06:52 -0700 (PDT) Message-ID: References: <20070911060349.993975297@sgi.com> <200709161853.12050.nickpiggin@yahoo.com.au> <200709181116.22573.nickpiggin@yahoo.com.au> <20070918191853.GB7541@v2.random> <1190163523.24970.378.camel@edge.yarra.acx> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=us-ascii Cc: Andrea Arcangeli , Nick Piggin , Christoph Lameter , Mel Gorman , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , William Lee Irwin III , David Chinner , Jens Axboe , Badari Pulavarty , Maxim Levitsky , Fengguang Wu , swin wang , totty.lu@gmail.com, hugh@veritas.com, joern@lazybastard.org To: Nathan Scott Return-path: Received: from smtp2.linux-foundation.org ([207.189.120.14]:35853 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751138AbXISBIK (ORCPT ); Tue, 18 Sep 2007 21:08:10 -0400 In-Reply-To: <1190163523.24970.378.camel@edge.yarra.acx> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org On Wed, 19 Sep 2007, Nathan Scott wrote: > > FWIW (and I hate to let reality get in the way of a good conspiracy) - > all SGI systems have always defaulted to using 4K blocksize filesystems; Yes. And I've been told that: > there's very few customers who would use larger .. who apparently would like to move to x86-64. That was what people implied at the kernel summit. > especially as the Linux > kernel limitations in this area are well known. There's no "16K mess" > that SGI is trying to clean up here (and SGI have offered both IA64 and > x86_64 systems for some time now, so not sure how you came up with that > whacko theory). Well, if that is the case, then I vote that we drop the whole patch-series entirely. It clearly has no reason for existing at all. There is *no* valid reason for 16kB blocksizes unless you have legacy issues. The performance issues have nothing to do with the block-size, and should be solvable by just making sure that your stupid "state of the art" crap SCSI controller gets contiguous physical memory, which is best done in the read-ahead code. So get your stories straight, people. Linus