From: Randy Dunlap <rdunlap@xenotime.net>
To: Tilman Schmidt <tilman@imap.cc>
Cc: Andi Kleen <ak@suse.de>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
jbeulich@novell.com
Subject: Re: [2.6.18-rc7-mm1] slow boot
Date: Thu, 28 Sep 2006 16:30:46 -0700 [thread overview]
Message-ID: <20060928163046.055b3ce0.rdunlap@xenotime.net> (raw)
In-Reply-To: <451C58AC.5060601@imap.cc>
On Fri, 29 Sep 2006 01:20:12 +0200 Tilman Schmidt wrote:
> 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?
Use 'readprofile'. Usage is described in
Documentation/basic_profiling.txt in the kernel source tree.
---
~Randy
next prev parent reply other threads:[~2006-09-28 23:29 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-24 16:59 Tilman Schmidt
2006-09-24 19:22 ` Valdis.Kletnieks
2006-09-24 22:02 ` Tilman Schmidt
2006-09-24 21:53 ` Andrew Morton
2006-09-24 22:15 ` Tilman Schmidt
2006-09-24 22:36 ` Alan Cox
2006-09-24 22:41 ` Andrew Morton
2006-09-26 23:48 ` Tilman Schmidt
2006-09-27 0:21 ` Andrew Morton
2006-09-28 17:00 ` Tilman Schmidt
2006-09-28 17:12 ` Andi Kleen
2006-09-28 23:20 ` Tilman Schmidt
2006-09-28 23:30 ` Randy Dunlap [this message]
2006-09-29 0:15 ` Tilman Schmidt
2006-09-29 7:10 ` Jan Beulich
2006-09-29 16:12 ` Andi Kleen
2006-09-29 18:39 ` Ingo Molnar
2006-10-04 7:05 ` Jan Beulich
2006-09-29 8:49 ` Andi Kleen
2006-09-24 21:58 ` [2.6.18-mm1] slow boot (was: [2.6.18-rc7-mm1] slow boot) Tilman Schmidt
2006-09-25 12:09 ` [2.6.18-rc7-mm1] slow boot Alexander Gran
2006-10-25 18:14 ` Tilman Schmidt
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