linux-kernel - Re: [PATCH 12/29] x86, tsx: Add a per thread transaction disable count

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Message-ID: <20130323162558.GD10811@pd.tnic>
Date:	Sat, 23 Mar 2013 17:25:58 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	x86@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 12/29] x86, tsx: Add a per thread transaction disable
 count

On Sat, Mar 23, 2013 at 04:52:56PM +0100, Borislav Petkov wrote:
> And wow, the XOR is *actually* faster. That's whopping three cycles on
> AMD. Similar observation on SNB.

Ok, correction: I was looking at the wrong row in the table. The XOR
version with an immediate and mem access is actually as fast as the
INC/DEC mem versions: 4 cycles on AMD F10h and 6 on SNB, according to
the docs. I should've realized that there's still a mem access there...

Anyway, the rest stands.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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