Messages in this thread | | | Subject | Re: [RFC][PATCH 0/5] Signal scalability series | From | Matt Fleming <> | Date | Mon, 03 Oct 2011 21:58:40 +0100 |
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On Mon, 2011-10-03 at 18:35 +0200, Oleg Nesterov wrote: > On 10/03, Matt Fleming wrote: > > > > Oh, are you referring to Oleg's email about the slow down under kvm? > > Yeah, admittedly that's a pretty clear indicator that something is wrong > > with the approach in this patch series. > > Or there was something wrong with my testing, please recheck. I specially > mentioned I was surprised by the numbers. May be kvm, or lockdep...
No, I don't think there was anything wrong with your testing method. I ran your command-line under Qemu and saw similar results - with the patches applied the single-threaded case slows down (not by 50%, it looks more like 25%, but that's still unacceptable and not at all what I had anticipated).
-- Matt Fleming, Intel Open Source Technology Center
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