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

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Message-ID: <4DB191C8.10501@computer.org>
Date:	Fri, 22 Apr 2011 16:33:44 +0200
From:	Jan Ceuleers <jan.ceuleers@...puter.org>
To:	Andrew Lutomirski <luto@....edu>
CC:	linux-kernel@...r.kernel.org, x86 <x86@...nel.org>
Subject: Re: [RFT] Please test rdtsc on various x86-64 hardware (app included)

On 18/04/11 21:32, Andrew Lutomirski wrote:
> Hi all-
>
> I'd appreciate some help testing rdtsc's ordering wrt memory on
> various hardware.

$ ./evil-clock-test
CPU vendor   : GenuineIntel
CPU model    : Intel(R) Core(TM) i3 CPU         540  @ 3.07GHz
CPU stepping : 2
TSC flags    : tsc rdtscp constant_tsc nonstop_tsc
Using lfence_rdtsc because you have an Intel CPU
Will test the "lfence;rdtsc" clock.
Now test passed  : margin 96 with 64336568 samples
Load3 test passed: margin 72 with 7731224 samples
Load test passed : margin 88 with 13575597 samples
Store test failed as expected: worst error 892 with 9605781 samples

Jan
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