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Date: Mon, 03 Oct 2011 21:58:40 +0100 From: Matt Fleming <matt@...sole-pimps.org> To: Oleg Nesterov <oleg@...hat.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Andi Kleen <andi@...stfloor.org>, Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, David Mosberger-Tang <davidm@...uge.net> Subject: Re: [RFC][PATCH 0/5] Signal scalability series 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 -- 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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