From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks Date: Mon, 07 May 2012 16:49:25 +0300 Message-ID: <4FA7D2E5.1020607@redhat.com> References: <20120502100610.13206.40.sendpatchset@codeblue.in.ibm.com> <20120507082928.GI16608@gmail.com> <4FA7888F.80505@redhat.com> <4FA7AAD8.6050003@linux.vnet.ibm.com> <4FA7BABA.4040700@redhat.com> <4FA7CC05.50808@linux.vnet.ibm.com> <4FA7CCA2.4030408@redhat.com> <4FA7D06B.60005@linux.vnet.ibm.com> <20120507134611.GB5533@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Jeremy Fitzhardinge , X86 , KVM , linux-doc@vger.kernel.org, Virtualization , Andi Kleen , "H. Peter Anvin" , Ingo Molnar , Stefano Stabellini , Xen Devel , Raghavendra K T , Ingo Molnar , Peter Zijlstra , Konrad Rzeszutek Wilk , Thomas Gleixner , Greg Kroah-Hartman , LKML , Attilio Rao , Andrew Morton , Linus Torvalds , Stephan Diestelhorst To: Srivatsa Vaddagiri Return-path: In-Reply-To: <20120507134611.GB5533@linux.vnet.ibm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: kvm.vger.kernel.org On 05/07/2012 04:46 PM, Srivatsa Vaddagiri wrote: > * Raghavendra K T [2012-05-07 19:08:51]: > > > I 'll get hold of a PLE mc and come up with the numbers soon. but I > > 'll expect the improvement around 1-3% as it was in last version. > > Deferring preemption (when vcpu is holding lock) may give us better than 1-3% > results on PLE hardware. Something worth trying IMHO. Is the improvement so low, because PLE is interfering with the patch, or because PLE already does a good job? -- error compiling committee.c: too many arguments to function