Re: 2.6.25 slow boot/reboot

[Glauber Costa]

Sergio Luis wrote:
> Ken Moffat wrote:
> > On Sun, Apr 27, 2008 at 05:23:57PM +0200, Bart Van Assche wrote:
> > > On Sun, Apr 27, 2008 at 7:37 AM, Sergio Luis <sergio@xxxxxxxxxxxxxx> wrote:
> > > >  This weekend I got some time and decided to try out 2.6.25, but its booting process was _really_ slow in my laptop[1]. With 'old' 2.6.24.5 my machine would take about 48 secs until it gave me the login prompt. And it would take about 22 seconds to reboot.
> > > Do you use LILO or GRUB for booting ? 2.6.25 works OK on the systems I
> > > tested, but LILO really needs a lot of time to load the 2.6.25 kernel.
> > > GRUB loads the 2.6.25 kernel at normal speed.
> > >
> > > Bart.
> >  ISTR that an _old_ version of lilo was mentioned earlier in this
> > thread.  As a datapoint, on my one desktop box which uses lilo (an
> > athlon64 uniprocessor) both 32 and 64-bit 2.6.25 kernels boot fine.
> > Both of those systems are with lilo-22.8, and gcc-4.2.2.
> >
> >  But, I think you (Bart) haven't said which version of lilo you are
> > using ?  If it isn't recent, perhaps upgrading it might help ?
> >
> >  For Sergio, you have my sympathy.  I totally failed to bisect my own
> > problem with 2.6.25-rc (and 2.6.24.1), although I did find the problem
> > by other means, and got a work-around, so I'm not competent to
> > diagnose what is wrong, but maybe I can help to tease out what is
> > different about your box.  As a start, you could try diffing your
> > config's for 2.6.24.5 and 2.6.25 in case something odd has changed.
>
> I tried bisecting and after some hours I got 
> 9713277607f9eac7d655c6854dd92bc2ce1b6f02 as first bad commit
>
> commit 9713277607f9eac7d655c6854dd92bc2ce1b6f02
> Author: Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>
> Date:   Wed Mar 19 14:25:43 2008 -0300
>
>     x86: boot cpus from cpu_up, instead of prepare_cpus
>
>     After all the infrastructure work, we're now prepared
>     to boot the cpus from cpu_up, and not from prepare_cpus.
>     So the difference between cold boot and hotplug is effectively
>     over, and the functions are used to the purposes they're meant to.
>
>     Signed-off-by: Glauber Costa <gcosta@xxxxxxxxxx>
>     Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
>
> (cc'ing Glauber and Ingo, maybe they can help)
>
> >  Or, perhaps this is a problem specific to a certain processor ?  So
> > far, I think all the list knows is that you have a problem, and an
> > old version of lilo.  More data might eventually help to identify
> > what is causing this.  If you have a fairly old version of lilo,
> > maybe you also have an old version of gcc ?
>
> lilo version is 22.8
> gcc version is 4.1.2
> the processor is an amd turion 64x2 2.0 ghz (tl-60) and I am building a 32bit kernel.
> please, let me know if more info is needed.
>
> >  For Bart too, which version(s) of gcc are you using on the systems
> > where lilo is slow to load, and which cpu(s) do you have there ?
> >
> > Ken, who relies on lilo for his server, and gets worried by reports
> > of trouble with it.
>
> note lilo is indeed much slower than grub to start booting the kernel here, but I am 
> talking about this 2.6.25 kernel taking almost 5 min to finish the boot process (once it is
> actually started by the bootloader) when it would take less than 1 minute with 2.6.24.5 in
> this same machine.
>
> thanks,
Can you give me more information on that?
your .config and cpuinfo would be a great start.

I'm specially interested in things involving APIC.
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