linux-kernel - Re: [RFC][PATCH 0/5] Signal scalability series

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Date:	Mon, 03 Oct 2011 16:43:33 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Oleg Nesterov <oleg@...hat.com>,
	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 08:28 -0700, Linus Torvalds wrote:
> On Sat, Oct 1, 2011 at 2:35 AM, Matt Fleming <matt@...sole-pimps.org> wrote:
> >
> > You and me both. Unfortunately, the ia64 guys had a different opinion,
> > http://www.spinics.net/lists/linux-ia64/msg08363.html
> 
> Well, considering that it apparently slows down the single-threaded
> case by 50% on an architecture that actually *matters*, I think the
> whole discussion is somewhat academic, don't you?
> 
> "Scalability" is pretty much never a valid excuse for "slows down the
> common case".

Where did you get the 50% slow down figure from?

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.

I thought I'd replied to that email but I guess not.

-- 
Matt Fleming, Intel Open Source Technology Center

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