linux-kernel - Re: [BUG] Core2 cpu triggers hard lockup with perf test

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Message-ID: <20160227144809.GC6356@twins.programming.kicks-ass.net>
Date:	Sat, 27 Feb 2016 15:48:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Wang Nan <wangnan0@...wei.com>, zheng.z.yan@...el.com,
	Kan Liang <kan.liang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Core2 cpu triggers hard lockup with perf test

On Sat, Feb 27, 2016 at 01:37:01PM +0100, Jiri Olsa wrote:
> we are getting hard lockups on Core2 cpus (model 23)

> I can't find what's special about Core2 CPU PEBS setup,
> it seems that oher CPUs are ok (tried on ivb/snb/hsw).
> 
> reverting the 156174999dd1 fixed the issue for me
> 
> ideas? thanks,

The obvious difference between Core2 and later chips is that Core2 only
has PEBS on a single counter (cnt0).

I'll try and have a closer look on Monday, I should still have a Core2
class machine around the house somewhere.