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

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Message-ID: <1301045882.3268.2.camel@edumazet-laptop>
Date:	Fri, 25 Mar 2011 10:38:02 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, 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>,
	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 vendredi 25 mars 2011 à 06:47 +0100, Eric Dumazet a écrit :

> I tried many different changes in BIOS and all failed (the machine is
> damn slow at boot, this takes age).

I even tried on a more recent hardware (ProLiant BL460c G7)

BIOS :	Version: I27  Release Date: 09/30/2010

[    0.021849] CPU0: Intel(R) Xeon(R) CPU           E5640  @ 2.67GHz stepping 02
[    0.123904] Performance Events: PEBS fmt1+, Westmere events, Broken BIOS detected, using software events only.
[    0.124125] [Firmware Bug]: the BIOS has corrupted hw-PMU resources (MSR 38d is 330)

I guess I'll have to patch my kernel, I doubt HP will make any change in this area.


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