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From: Con Kolivas <kernel@kolivas.org>
To: Willy Tarreau <w@1wt.eu>
Subject: Re: [ANNOUNCE] Staircase Deadline cpu scheduler version 0.45
Date: Sun, 22 Apr 2007 17:27:43 +1000
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Cc: linux kernel mailing list <linux-kernel@vger.kernel.org>,
       ck list <ck@vds.kolivas.org>, Ingo Molnar <mingo@elte.hu>,
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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