From: Eric Sandeen Subject: Re: Block size limited to Linux page size? Date: Tue, 03 Jun 2008 12:10:18 -0500 Message-ID: <48457AFA.6000700@redhat.com> References: <46221.143.166.255.40.1212512440.squirrel@tomslinux.homelinux.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: linux-ext4@vger.kernel.org To: Thomas King Return-path: Received: from mx1.redhat.com ([66.187.233.31]:60747 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756831AbYFCRKb (ORCPT ); Tue, 3 Jun 2008 13:10:31 -0400 In-Reply-To: <46221.143.166.255.40.1212512440.squirrel@tomslinux.homelinux.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: Thomas King wrote: > To fill in one piece of information, I'm reading the maximum block size can be > limited by the Linux page size, 4K on x86. Is this true in ext4? > > I know this is a basic question, so thanks for humoring me. > Tom King Generally, yes. There are patches: ftp://ftp.kernel.org/pub/linux/kernel/people/christoph/largeblocksize/4/patches/ but I'm not sure what the current state of all that is, honestly... Before it's discussed as a limitation though it'd be interesting to see some recent benchmarks on how much it might actually matter. >From some reports: http://kerneltrap.org/Linux/Large_Blocksize_Performance it may indeed help. -Eric