linux-kernel - Re: 2.6.19-rc6-mm1 -- sched-improve-migration-accuracy.patch slows boot

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Date:	Sun, 26 Nov 2006 07:24:23 +0100
From:	Mike Galbraith <efault@....de>
To:	Don Mullis <dwm@...r.net>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	mingo@...e.hu
Subject: Re: 2.6.19-rc6-mm1 -- sched-improve-migration-accuracy.patch slows
	boot

On Sat, 2006-11-25 at 11:48 -0800, Don Mullis wrote:
> > +sched-improve-migration-accuracy.patch
> > +sched-improve-migration-accuracy-tidy.patch
> 
> Bisection shows that this pair of patches raises the boot time;
> specifically, the delay from logging of
> 
>         "INIT: version 2.86 booting"
>         
> to
>         "                Welcome to Fedora Core"
>  
> goes from 4s to 4m40s.  From there to

Wow.

>  
> 
>     "Setting clock  (utc): Sat Nov 25 10:18:11 PST 2006 [  OK  ]"
> 
> takes an additional 30s.

This must be a bisection false positive.  The patch in question is
essentially a no-op for a UP kernel.
        
	-Mike

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