From mboxrd@z Thu Jan 1 00:00:00 1970 From: Srivatsa Vaddagiri Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks Date: Mon, 7 May 2012 19:25:24 +0530 Message-ID: <20120507135524.GA30420@linux.vnet.ibm.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> <4FA7D2E5.1020607@redhat.com> Reply-To: Srivatsa Vaddagiri Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Cc: Raghavendra K T , Ingo Molnar , Linus Torvalds , Andrew Morton , Jeremy Fitzhardinge , Greg Kroah-Hartman , Konrad Rzeszutek Wilk , "H. Peter Anvin" , Marcelo Tosatti , X86 , Gleb Natapov , Ingo Molnar , Attilio Rao , Virtualization , Xen Devel , linux-doc@vger.kernel.org, KVM , Andi Kleen , Stefano Stabellini , Stephan Diestelhorst , LKML , Peter Zijlstra , Tho To: Avi Kivity Return-path: Content-Disposition: inline In-Reply-To: <4FA7D2E5.1020607@redhat.com> Sender: linux-doc-owner@vger.kernel.org List-Id: kvm.vger.kernel.org * Avi Kivity [2012-05-07 16:49:25]: > > 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? I think its latter (PLE already doing a good job). - vatsa