linux-kernel - Re: [ANNOUNCE] Staircase Deadline cpu scheduler version 0.45

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Date:	Sun, 22 Apr 2007 17:27:43 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	Willy Tarreau <w@....eu>
Cc:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	ck list <ck@....kolivas.org>, Ingo Molnar <mingo@...e.hu>,
	Mike Galbraith <efault@....de>, Al Boldi <a1426z@...ab.com>,
	Peter Williams <pwil3058@...pond.net.au>,
	Nick Piggin <npiggin@...e.de>, Matt Mackall <mpm@...enic.com>,
	Bill Huey <billh@...ppy.monkey.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	Gene Heskett <gene.heskett@...il.com>
Subject: Re: [ANNOUNCE] Staircase Deadline cpu scheduler version 0.45

On Sunday 22 April 2007 17:00, Willy Tarreau wrote:
> On Sun, Apr 22, 2007 at 02:41:48PM +1000, Con Kolivas wrote:
> > A significant bugfix for SMP balancing was just posted for the staircase
> > deadline cpu scheduler which improves behaviour dramatically on any SMP
> > machine.
> >
> > Thanks to Willy Tarreau for noticing likely fault point.
> >
> > Also requested was a version in the Makefile so this version of the patch
> > adds -sd045 to the kernel version.
>
> Con, I'm sorry, but it is worse with this one :-(

Well that was quick testing, thanks.
>
> The lag when typing in xterms is even more noticeable and vmstat output
> oscillates between 8 and 65, with idle rates around 50%, as you can see
> below :

> Renicing X or not does not change anything here.
>
> I suspect that the bug you fixed was hiding another one :-/
> If you want me to test another patch, feel free to ask.

Thanks. Clearly still a bug in there. I have to keep looking. The other 
changes are still valid so I have to run with them.

> Willy

-- 
-ck
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