linux-kernel - Re: [PATCH 1/2] lib: Provide generic atomic64

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Message-ID: <ada4ouixlk2.fsf@cisco.com>
Date:	Sun, 14 Jun 2009 19:44:45 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	benh@...nel.crashing.org, akpm@...ux-foundation.org,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] lib: Provide generic atomic64_t implementation


 > The new Nehalems provide 8 logical threads in a single socket.  All
 > those threads share a cache, and they have cmpxchg8b anyway, so this
 > won't matter.

FWIW, Nehalem EX actually goes to 8 cores/16 threads per socket.  But
worrying about 32-bit performance on Nehalem is a little silly -- this
simplest solution is simply to run a 64-bit kernel.

 - R.
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