linux-kernel - Re: [2.6.18-rc7-mm1] slow boot

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Date:	Fri, 29 Sep 2006 01:20:12 +0200
From:	Tilman Schmidt <tilman@...p.cc>
To:	Andi Kleen <ak@...e.de>
CC:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, jbeulich@...ell.com
Subject: Re: [2.6.18-rc7-mm1] slow boot

Am 28.09.2006 19:12 schrieb Andi Kleen:
> On Thursday 28 September 2006 19:00, Tilman Schmidt wrote:
> 
> missing context here, but ...

Forwarded by separate mail.

>> x86_64-mm-i386-stacktrace-unwinder.patch
[...]
>> Backing out just this patch from 2.6.18-mm1 (and resolving conflicts
>> manually the obvious way) gets the boot time back to normal (ie. as
>> fast as 2.6.18 mainline) on my
>> Linux gx110 2.6.18-mm1-noinitrd #2 PREEMPT Thu Sep 28 18:48:32 CEST 2006 i686 i686 i386 GNU/Linux
>> machine.
> 
> Hmm, i assume you have lockdep on.

Indeed.

> The new backtracer is of course slower
> than the old one and it will slow down lockdep which takes a lot of backtraces. 
> But it shouldn't be a significant slowdown.

Unfortunately, it is. Boot time roughly doubles from 39 to 76 secs.

> Can you perhaps boot with profile=1 and then send readprofile output after
> boot?

I'm afraid I'll need instructions for that. I assume "profile=1"
is to be appended to the kernel command line; but how do I
retrieve that readprofile output you are asking for?

Thanks
Tilman

-- 
Tilman Schmidt                          E-Mail: tilman@...p.cc
Bonn, Germany
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