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Subject: Re: [PATCH RFC] x86: avoid atomic operation in
 test_and_set_bit_lock if possible
From: Eric Dumazet <eric.dumazet@gmail.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@elte.hu>, Jack Steiner <steiner@sgi.com>,
        Jan Beulich <JBeulich@novell.com>, Borislav Petkov <bp@amd64.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Nick Piggin <npiggin@kernel.dk>, "x86@kernel.org" <x86@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ingo Molnar <mingo@redhat.com>, tee@sgi.com,
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        "H. Peter Anvin" <hpa@zytor.com>
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Date: Fri, 25 Mar 2011 10:38:02 +0100
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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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