Messages in this thread | | | Date | Thu, 28 Sep 2006 16:30:46 -0700 | From | Randy Dunlap <> | Subject | Re: [2.6.18-rc7-mm1] slow boot |
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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.
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