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Re: [Xen-devel] [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks
- To: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
- From: Avi Kivity <avi@xxxxxxxxxx>
- Date: Mon, 07 May 2012 17:54:30 +0300
- Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, X86 <x86@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Attilio Rao <attilio.rao@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Stephan Diestelhorst <stephan.diestelhorst@xxxxxxx>
- Delivery-date: Tue, 15 May 2012 11:14:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 05/07/2012 05:52 PM, Avi Kivity wrote:
> > Having said that, it is hard for me to resist saying :
> > bottleneck is somewhere else on PLE m/c and IMHO answer would be
> > combination of paravirt-spinlock + pv-flush-tb.
> >
> > But I need to come up with good number to argue in favour of the claim.
> >
> > PS: Nikunj had experimented that pv-flush tlb + paravirt-spinlock is a
> > win on PLE where only one of them alone could not prove the benefit.
> >
>
> I'd like to see those numbers, then.
>
Note: it's probably best to try very wide guests, where the overhead of
iterating on all vcpus begins to show.
--
error compiling committee.c: too many arguments to function
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