Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753711Ab0H0U3t (ORCPT ); Fri, 27 Aug 2010 16:29:49 -0400 Received: from mga01.intel.com ([192.55.52.88]:35580 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752327Ab0H0U3o convert rfc822-to-8bit (ORCPT ); Fri, 27 Aug 2010 16:29:44 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.56,280,1280732400"; d="scan'208";a="832586068" From: "Luck, Tony" To: Petr Tesarik , "linux-ia64@vger.kernel.org" CC: "linux-kernel@vger.kernel.org" , Hedi Berriche Date: Fri, 27 Aug 2010 13:29:41 -0700 Subject: RE: Serious problem with ticket spinlocks on ia64 Thread-Topic: Serious problem with ticket spinlocks on ia64 Thread-Index: ActF7PEv2I9vz36oSbC8JQLkGmsl5wAEsetAAAmmUxA= Message-ID: <987664A83D2D224EAE907B061CE93D53015D91D3B7@orsmsx505.amr.corp.intel.com> References: <201008271537.35709.ptesarik@suse.cz> <987664A83D2D224EAE907B061CE93D53015D91D029@orsmsx505.amr.corp.intel.com> In-Reply-To: <987664A83D2D224EAE907B061CE93D53015D91D029@orsmsx505.amr.corp.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 566 Lines: 13 > If this is a memory ordering problem (and that seems quite plausible) > then a liberal sprinkling of "ia64_mf()" calls throughout the spinlock > routines would probably make it go away. I think I take this back ... if it were a memory ordering problem, then it could show up any time - not just at wrap-around. -Tony -- 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/