Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756032AbYJKNzA (ORCPT ); Sat, 11 Oct 2008 09:55:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753055AbYJKNyx (ORCPT ); Sat, 11 Oct 2008 09:54:53 -0400 Received: from one.firstfloor.org ([213.235.205.2]:57466 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752805AbYJKNyw (ORCPT ); Sat, 11 Oct 2008 09:54:52 -0400 Date: Sat, 11 Oct 2008 16:01:19 +0200 From: Andi Kleen To: Nick Piggin Cc: Andi Kleen , Dave Jones , x86@kernel.org, Linux Kernel Subject: Re: Update cacheline size on X86_GENERIC Message-ID: <20081011140119.GC12131@one.firstfloor.org> References: <20081009171453.GA15321@redhat.com> <200810112242.28229.nickpiggin@yahoo.com.au> <20081011131115.GB12131@one.firstfloor.org> <200810120048.31141.nickpiggin@yahoo.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200810120048.31141.nickpiggin@yahoo.com.au> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 699 Lines: 20 > No immediate ideas. Jens probably is a good person to cc. With direct IO > workloads, hd_struct should mostly only be touched in partition remapping > and IO accounting. I found it doubtful if grouping the rw and ro members together was a good idea. > At this point, you would want to cacheline align hd_struct. So if you The problem is probably not false sharing, but simply cache misses because it's so big. I think. -Andi -- ak@linux.intel.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/