Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933278AbaDBUfr (ORCPT ); Wed, 2 Apr 2014 16:35:47 -0400 Received: from g4t3426.houston.hp.com ([15.201.208.54]:18419 "EHLO g4t3426.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933048AbaDBUfo (ORCPT ); Wed, 2 Apr 2014 16:35:44 -0400 Message-ID: <533C7485.3030203@hp.com> Date: Wed, 02 Apr 2014 16:35:17 -0400 From: Waiman Long User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.12) Gecko/20130109 Thunderbird/10.0.12 MIME-Version: 1.0 To: Konrad Rzeszutek Wilk CC: Marcos Matsunaga , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Peter Zijlstra , linux-arch@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Paolo Bonzini , "Paul E. McKenney" , Rik van Riel , Linus Torvalds , Raghavendra K T , David Vrabel , Oleg Nesterov , Gleb Natapov , Aswin Chandramouleeswaran , Scott J Norton , Chegu Vinod , boris.ostrovsky@oracle.com Subject: Re: [PATCH v8 00/10] qspinlock: a 4-byte queue spinlock with PV support References: <1396445259-27670-1-git-send-email-Waiman.Long@hp.com> <20140402143201.GF12188@phenom.dumpdata.com> In-Reply-To: <20140402143201.GF12188@phenom.dumpdata.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/02/2014 10:32 AM, Konrad Rzeszutek Wilk wrote: > On Wed, Apr 02, 2014 at 09:27:29AM -0400, Waiman Long wrote: >> N.B. Sorry for the duplicate. This patch series were resent as the >> original one was rejected by the vger.kernel.org list server >> due to long header. There is no change in content. >> >> v7->v8: >> - Remove one unneeded atomic operation from the slowpath, thus >> improving performance. >> - Simplify some of the codes and add more comments. >> - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable >> unfair lock. >> - Reduce unfair lock slowpath lock stealing frequency depending >> on its distance from the queue head. >> - Add performance data for IvyBridge-EX CPU. > FYI, your v7 patch with 32 VCPUs (on a 32 cpu socket machine) on an > HVM guest under Xen after a while stops working. The workload > is doing 'make -j32' on the Linux kernel. > > Completely unresponsive. Thoughts? > Thank for reporting that. I haven't done that much testing on Xen. My focus was in KVM. I will perform more test on Xen to see if I can reproduce the problem. -Longman -- 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/