linux-kernel - Re: [RFT] Please test rdtsc on various x86-64 hardware (app included)

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Message-ID: <20110418203726.GA30868@elte.hu>
Date:	Mon, 18 Apr 2011 22:37:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Lutomirski <luto@....edu>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>, x86 <x86@...nel.org>
Subject: Re: [RFT] Please test rdtsc on various x86-64 hardware (app included)

* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> Some opteron love would be good, but I don't have access to any right here.

Here's one:

 CPU vendor   : AuthenticAMD
 CPU model    : Quad-Core AMD Opteron(tm) Processor 8356
 CPU stepping : 3
 TSC flags    : tsc rdtscp constant_tsc nonstop_tsc
 Using mfence_rdtsc because you don't have an Intel CPU
 Will test the "mfence;rdtsc" clock.
 Now test passed  : margin 252 with 7198256 samples
 Load3 test passed: margin 536 with 1833844 samples
 Load test passed : margin 219 with 3097882 samples
 Store test passed: margin 250 with 3553454 samples

Thanks,

	Ingo
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