From: Roland Dreier <rdreier@cisco.com>
To: Avi Kivity <avi@redhat.com>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
Paul Mackerras <paulus@samba.org>,
akpm@linux-foundation.org,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 1/2] lib: Provide generic atomic64_t implementation
Date: Sun, 14 Jun 2009 19:44:45 -0700 [thread overview]
Message-ID: <ada4ouixlk2.fsf@cisco.com> (raw)
In-Reply-To: <4A34F564.2010500@redhat.com> (Avi Kivity's message of "Sun, 14 Jun 2009 16:04:36 +0300")
> 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.
WARNING: multiple messages have this Message-ID (diff)
From: Roland Dreier <rdreier@cisco.com>
To: Avi Kivity <avi@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
benh@kernel.crashing.org, akpm@linux-foundation.org,
linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] lib: Provide generic atomic64_t implementation
Date: Sun, 14 Jun 2009 19:44:45 -0700 [thread overview]
Message-ID: <ada4ouixlk2.fsf@cisco.com> (raw)
In-Reply-To: <4A34F564.2010500@redhat.com> (Avi Kivity's message of "Sun, 14 Jun 2009 16:04:36 +0300")
> 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.
next prev parent reply other threads:[~2009-06-15 2:44 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-13 7:10 [PATCH 1/2] lib: Provide generic atomic64_t implementation Paul Mackerras
2009-06-13 7:10 ` Paul Mackerras
2009-06-13 20:13 ` Linus Torvalds
2009-06-13 20:13 ` Linus Torvalds
2009-06-13 20:25 ` Linus Torvalds
2009-06-13 20:25 ` Linus Torvalds
2009-06-13 20:56 ` Ingo Molnar
2009-06-13 20:56 ` Ingo Molnar
2009-06-14 11:53 ` Avi Kivity
2009-06-14 11:53 ` Avi Kivity
2009-06-14 12:21 ` Paul Mackerras
2009-06-14 12:21 ` Paul Mackerras
2009-06-14 13:04 ` Avi Kivity
2009-06-14 13:04 ` Avi Kivity
2009-06-15 2:44 ` Roland Dreier [this message]
2009-06-15 2:44 ` Roland Dreier
2009-06-15 4:30 ` Paul Mackerras
2009-06-15 4:30 ` Paul Mackerras
2009-06-16 22:27 ` Gabriel Paubert
2009-06-16 22:27 ` Gabriel Paubert
2009-06-13 21:53 ` Arnd Bergmann
2009-06-13 21:53 ` Arnd Bergmann
2009-06-18 23:55 ` Mike Frysinger
2009-06-18 23:55 ` Mike Frysinger
2009-06-19 0:46 ` Benjamin Herrenschmidt
2009-06-19 0:46 ` Benjamin Herrenschmidt
2009-06-19 0:47 ` Paul Mackerras
2009-06-19 0:47 ` Paul Mackerras
2009-06-19 0:49 ` Mike Frysinger
2009-06-19 0:49 ` Mike Frysinger
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