Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750771AbWBUXPL (ORCPT ); Tue, 21 Feb 2006 18:15:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750775AbWBUXPL (ORCPT ); Tue, 21 Feb 2006 18:15:11 -0500 Received: from omx2-ext.sgi.com ([192.48.171.19]:24706 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S1750771AbWBUXPJ (ORCPT ); Tue, 21 Feb 2006 18:15:09 -0500 Date: Tue, 21 Feb 2006 15:14:47 -0800 (PST) From: Christoph Lameter To: Nick Piggin cc: Ravikiran G Thirumalai , Andrew Morton , linux-kernel@vger.kernel.org, "Shai Fultheim (Shai@scalex86.org)" Subject: Re: [patch] Cache align futex hash buckets In-Reply-To: Message-ID: References: <20060220233242.GC3594@localhost.localdomain> <43FA8938.70006@yahoo.com.au> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 603 Lines: 14 On Tue, 21 Feb 2006, Christoph Lameter wrote: > It does if you essentially have a 4k cacheline (because you are doing NUMA > in software with multiple PCs....) and transferring control of that > cacheline is comparatively expensive. Of course the above statement is a rather strong simplification of what is actually happening .... but I hope it helps. - 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/