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

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Message-Id: <1164484124.2894.50.camel@localhost.localdomain>
Date:	Sat, 25 Nov 2006 11:48:44 -0800
From:	Don Mullis <dwm@...r.net>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: 2.6.19-rc6-mm1 -- sched-improve-migration-accuracy.patch slows
	boot

> +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 

    "Setting clock  (utc): Sat Nov 25 10:18:11 PST 2006 [  OK  ]"

takes an additional 30s.

A possibly relevant observation: On this particular box, `date` is
always a few seconds behind `hwclock`.  The time difference varies 
from boot to boot, but does not appear to grow over time.

View attachment "2.6.19-rc6-mm1.log" of type "text/x-log" (9441 bytes)

View attachment "config" of type "text/plain" (30952 bytes)