linux-kernel - Re: regression - 2.6.36 -> 2.6.37 - kvm

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Message-ID: <4D664E85.8070808@redhat.com>
Date:	Thu, 24 Feb 2011 14:26:45 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Nikola Ciprich <extmaillist@...uxbox.cz>
CC:	KVM list <kvm@...r.kernel.org>,
	Linux kernel list <linux-kernel@...r.kernel.org>,
	nikola.ciprich@...uxbox.cz
Subject: Re: regression - 2.6.36 -> 2.6.37 - kvm - 32bit SMP guests don't
 boot

On 02/24/2011 01:27 PM, Nikola Ciprich wrote:
> >  Not very useful when the guest is making progress, I'm afraid.
> can perf report help here?
>
> >  Can you try a little trace-cmd -e kvm -b 20000?
> ugh, I'm afraid I'll have some dumb questions here :-[
> You mean this: git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git ?

Yes.  If you have udis86 and udis86-devel installed when building it, 
it's even better.

> and then re-execute qemu-kvm using it? or I'm totally wrong?

You don't have to execute qemu-kvm under it, if you have a running 
instance you can run trace-cmd in parallel and it will record whatever's 
happening.

> >  Sure.  Something similar that came up - sometimes Windows IDE drivers
> >  fall back to PIO mode.  Are you using IDE?  If so, please check whether
> >  it's using DMA or PIO.
> I'll check, but this problem occurs only during fsck phase, when to guest boots, then it runs pretty fast..
> so maybe during boot it might fall back to PIO, but from guest, I guess I won't have a chance
> to find out.. can I somehow check it from host?

The trace-cmd output will show.  Please run trace-cmd report afterwards 
and post the results somewhere.


-- 
error compiling committee.c: too many arguments to function

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