- To: Avi Kivity <avi@xxxxxxxxxx>
- Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks
- From: Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>
- Date: Mon, 7 May 2012 19:25:24 +0530
- Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, X86 <x86@xxxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Attilio Rao <attilio.rao@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Stephan Diestelhorst <stephan.diestelhorst@xxxxxxx>
- Delivered-to: virtualization@xxxxxxxxxxxxxxxxxxxxxxxx
- In-reply-to: <4FA7D2E5.1020607@redhat.com>
- Reply-to: Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>
- User-agent: Mutt/1.5.21 (2010-09-15)
* Avi Kivity <avi@xxxxxxxxxx> [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
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