linux-kernel - Re: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit

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Date:	Thu, 24 Mar 2011 22:02:37 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jack Steiner <steiner@....com>, Jan Beulich <JBeulich@...ell.com>,
	Borislav Petkov <bp@...64.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...nel.dk>,
	"x86@...nel.org" <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, tee@....com,
	Nikanth Karthikesan <knikanth@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH RFC] x86: avoid atomic operation in
 test_and_set_bit_lock if possible

Le jeudi 24 mars 2011 à 21:54 +0100, Ingo Molnar a écrit :

> Does it work better if you run it as root?
> 

I confess I always am root on my dev machines :(

> To easiest way to debug as user is to do:
> 
>   echo -1 > /proc/sys/kernel/perf_event_paranoid 
> 
> and to put this into /etc/sysctl.conf:
> 
>   kernel.perf_event_paranoid = -1
> 


Hmm... on one machine (HP BL460c G1 ) I do have :

[    0.015998] Performance Events: PEBS fmt0+, Core2 events, Broken BIOS detected, using software events only.
[    0.015998] [Firmware Bug]: the BIOS has corrupted hw-PMU resources (MSR 186 is 43003c)


and the other one (HB BL460c G6)

[    0.122760] Performance Events: PEBS fmt1+, Nehalem events, Broken BIOS detected, using software events only.
[    0.123047] [Firmware Bug]: the BIOS has corrupted hw-PMU resources (MSR 38d is 330)


Hmm.. I have latest HP BIOS.

Version: I15
Release Date: 10/25/2010

and

Version: I24
Release Date: 09/02/2010

I am pretty sure I used "-e ..." some time ago with same BIOS.



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