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Date: Mon, 22 Apr 2013 16:50:38 -0400 From: Rik van Riel <riel@...hat.com> To: Peter Zijlstra <peterz@...radead.org> CC: Jiannan Ouyang <ouyang@...pitt.edu>, LKML <linux-kernel@...r.kernel.org>, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>, Avi Kivity <avi.kivity@...il.com>, Gleb Natapov <gleb@...hat.com>, Ingo Molnar <mingo@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>, Srikar <srikar@...ux.vnet.ibm.com>, "H. Peter Anvin" <hpa@...or.com>, "Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>, KVM <kvm@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Chegu Vinod <chegu_vinod@...com>, "Andrew M. Theurer" <habanero@...ux.vnet.ibm.com>, Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>, Andrew Jones <drjones@...hat.com>, Karen Noel <knoel@...hat.com> Subject: Re: Preemptable Ticket Spinlock On 04/22/2013 04:48 PM, Peter Zijlstra wrote: > Hmm.. it looked like under light overcommit the paravirt ticket lock > still had some gain (~10%) and of course it brings the fairness thing > which is always good. > > I can only imagine the mess unfair + vcpu preemption can bring to guest > tasks. If you think unfairness + vcpu preemption is bad, you haven't tried full fairness + vcpu preemption :) -- All rights reversed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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