Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755289Ab1CXRb0 (ORCPT ); Thu, 24 Mar 2011 13:31:26 -0400 Received: from relay1.sgi.com ([192.48.179.29]:35931 "HELO relay.sgi.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754572Ab1CXRbX (ORCPT ); Thu, 24 Mar 2011 13:31:23 -0400 Date: Thu, 24 Mar 2011 12:30:20 -0500 From: Jack Steiner To: Jan Beulich Cc: Borislav Petkov , Ingo Molnar , Peter Zijlstra , Nick Piggin , "x86@kernel.org" , Thomas Gleixner , Andrew Morton , Linus Torvalds , Ingo Molnar , tee@sgi.com, Nikanth Karthikesan , "linux-kernel@vger.kernel.org" , "H. Peter Anvin" Subject: Re: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit_lock if possible Message-ID: <20110324173020.GA26761@sgi.com> References: <201103241026.01624.knikanth@suse.de> <20110324085647.GI30812@elte.hu> <20110324145221.GC31194@aftab> <4D8B83DA02000078000381DE@vpn.id2.novell.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4D8B83DA02000078000381DE@vpn.id2.novell.com> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 682 Lines: 18 > > This cacheline bouncing was actually observed and measured > on SGI UV systems, but I'm not certain we're permitted to publish > that data. I'm copying the two SGI guys who had reported that > issue (and the special case fix, which Nikanth simply generalized) > to us, for them to decide. We frequently run into the cacheline bouncing issues. I don't have the data handy that you refer to, but feel free to publish it. --- jack -- 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/