Message-ID: <48A468F5.4050308@zytor.com>
Date: Thu, 14 Aug 2008 10:18:45 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
CC: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       Andi Kleen <andi@firstfloor.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
       Steven Rostedt <srostedt@redhat.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       David Miller <davem@davemloft.net>, Roland McGrath <roland@redhat.com>,
       Ulrich Drepper <drepper@redhat.com>,
       Rusty Russell <rusty@rustcorp.com.au>,
       Gregory Haskins <ghaskins@novell.com>,
       Arnaldo Carvalho de Melo <acme@redhat.com>,
       "Luis Claudio R. Goncalves" <lclaudio@uudg.org>,
       Clark Williams <williams@redhat.com>,
       Christoph Lameter <cl@linux-foundation.org>
Subject: Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race with	preemptible
 kernel and CPU hotplug
References: <alpine.LFD.1.10.0808131119290.3462@nehalem.linux-foundation.org> <20080813184142.GM1366@one.firstfloor.org> <20080813193011.GC15547@Krystal> <20080813193715.GQ1366@one.firstfloor.org> <20080813200119.GA18966@Krystal> <20080813234156.GA25775@Krystal> <48A375E3.9090609@zytor.com> <48A388CE.2020404@goop.org> <20080814014944.GA31883@Krystal> <48A3A806.8060509@goop.org> <20080814151805.GA29507@Krystal> <48A465BA.5050406@goop.org>
In-Reply-To: <48A465BA.5050406@goop.org>
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Jeremy Fitzhardinge wrote:
> 
>> Xeon 2.0GHz
>>
>>
>> Summary
>>
>>                   no lock prefix (s)   with lock prefix (s)    Speedup
>> make -j1 kernel/      33.94 +/- 0.07         34.91 +/- 0.27      2.8 %
>> hackbench 50           2.99 +/- 0.01          3.74 +/- 0.01     25.1 %
>>   
> 
> Yeah, that's more severe than I would have expected.  Perhaps I have AMD 
> numbers in my head.
> 

He doesn't specify what kind of Xeon it is (there are three completely 
different CPUs under the Xeon brand name: P3 Xeon, P4 Xeon, and Core 2 
Xeon), but I think it's a P4 Xeon.

Netburst sucked in so many ways, and this is one of them.

	-hpa


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