linux-kernel - Re: perf sched record hangs machine

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Date:	Wed, 23 Sep 2009 10:15:07 +0100
From:	Chris Malley <mail@...ismalley.co.uk>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf sched record hangs machine

2009/9/23 Cyrill Gorcunov <gorcunov@...il.com>:
>
> Btw, meanwhile Chris may try to pass lapic boot-option in attempt to
> reenable apic via msr registers. Also (iirc) i feel we may be hiding
> errors if complete noop apic would be used since i belive we need to
> check out under which condition a particular operation is called and
> when apic is disabled it's mean we're switched to UP mode and
> inter-cpu interrupts are under suspicion too. Will take a look during
> ~6 hours ;)
>

Hi Cyrill

Heh, yes that just occurred to me as well.  With the lapic boot option
I can't reproduce the problem, and get a good recording every time.
Don't know why the BIOS had disabled it (can't see any specific
option).

cheers
Chris
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