netdev - Re: [PATCH] x86: percpu_to_op() misses memory and flags clobbers

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Message-ID: <20090402095217.GA30759@gondor.apana.org.au>
Date:	Thu, 2 Apr 2009 17:52:17 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	dada1@...mosbay.com, mingo@...e.hu, htejun@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	joe@...ches.com, rusty@...tcorp.com.au
Subject: Re: [PATCH] x86: percpu_to_op() misses memory and flags clobbers

Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> 
> There's probably not a lot of value in this.  The Intel and AMD 
> optimisation guides tend to deprecate inc/dec in favour of using 
> add/sub, because the former can cause pipeline stalls due to its partial 
> flags update.

Is this still the case on the latest Intel CPUs?

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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