From: Benjamin LaHaise <bcrl@kvack.org>
To: Andi Kleen <ak@suse.de>
Cc: David Howells <dhowells@redhat.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Arjan van de Ven <arjan@infradead.org>,
Dong Feng <middle.fengdong@gmail.com>,
Paul Mackerras <paulus@samba.org>,
Christoph Lameter <clameter@sgi.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: Why Semaphore Hardware-Dependent?
Date: Tue, 29 Aug 2006 15:10:15 -0400 [thread overview]
Message-ID: <20060829191015.GL18092@kvack.org> (raw)
In-Reply-To: <200608291256.54665.ak@suse.de>
On Tue, Aug 29, 2006 at 12:56:54PM +0200, Andi Kleen wrote:
> We've completely given up these kinds of micro optimization for spinlocks,
> which are 1000x as critical as rwsems. And nobody was able to benchmark
> a difference.
That is false. It shows up on things like netperf on the P4, or the AF_UNIX
component of lmbench.
-ben
--
"Time is of no importance, Mr. President, only life is important."
Don't Email: <dont@kvack.org>.
next prev parent reply other threads:[~2006-08-29 19:10 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-27 19:22 Why Semaphore Hardware-Dependent? Dong Feng
2006-08-27 20:52 ` Andi Kleen
2006-08-27 21:05 ` Christoph Lameter
2006-08-27 21:39 ` Andi Kleen
2006-08-27 22:14 ` Christoph Lameter
2006-08-28 0:18 ` Paul Mackerras
2006-08-28 5:14 ` Chris Wedgwood
2006-08-28 5:21 ` Christoph Lameter
2006-08-28 5:56 ` Jan Engelhardt
2006-08-28 12:35 ` linux-os (Dick Johnson)
2006-08-28 7:23 ` Andi Kleen
2006-08-29 1:00 ` Paul Mackerras
2006-08-28 7:30 ` Arjan van de Ven
2006-08-29 1:18 ` Nick Piggin
2006-08-29 6:07 ` Andi Kleen
2006-09-13 17:54 ` Nick Piggin
2006-08-29 10:05 ` David Howells
2006-08-29 10:56 ` Andi Kleen
2006-08-29 17:40 ` Andrew Morton
2006-08-29 19:10 ` Benjamin LaHaise [this message]
2006-08-29 15:56 ` Christoph Lameter
2006-08-29 16:20 ` Ralf Baechle
2006-08-29 16:25 ` David Howells
2006-08-29 16:28 ` Christoph Lameter
2006-08-29 16:57 ` David Howells
2006-08-29 16:53 ` Ralf Baechle
2006-08-29 16:58 ` Geert Uytterhoeven
2006-08-29 17:22 ` Andi Kleen
2006-08-29 17:36 ` Christoph Lameter
2006-08-29 18:18 ` Andi Kleen
2006-08-29 18:30 ` David Howells
2006-08-29 18:33 ` Andi Kleen
2006-08-29 18:56 ` David Howells
2006-08-29 18:41 ` Christoph Lameter
2006-09-13 18:04 ` Nick Piggin
2006-09-13 18:07 ` Christoph Lameter
2006-09-13 18:13 ` Nick Piggin
2006-09-13 18:16 ` Christoph Lameter
2006-09-13 18:50 ` David Howells
2006-09-13 19:25 ` Nick Piggin
2006-09-14 11:41 ` David Howells
2006-09-14 15:27 ` Nick Piggin
2006-09-14 15:38 ` Nick Piggin
2006-09-15 8:59 ` David Howells
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