From: Andi Kleen <andi@firstfloor.org>
To: Andrew Lutomirski <luto@mit.edu>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andi Kleen <andi@firstfloor.org>, x86 <x86@kernel.org>
Subject: Re: [RFT] Please test rdtsc on various x86-64 hardware (app included)
Date: Tue, 19 Apr 2011 00:10:51 +0200 [thread overview]
Message-ID: <20110418221051.GR16484@one.firstfloor.org> (raw)
In-Reply-To: <BANLkTi=0gS2TSGgG15DbDPGttzCvEbEvaw@mail.gmail.com>
I tested it on a dual Westmere-EP and a Quad Westmere-EX.
Seems to pass everywhere.
However I kept the default MAX_THREADS 4. Shouldn't that be
increased for the large systems?
I suspect the tests as written didn't really use the large
systems.
Dual:
CPU vendor : GenuineIntel
CPU model : Intel(R) Xeon(R) CPU E5640 ...
CPU stepping : ..
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 failed : worst error 48 with 48647928 samples
Load3 test passed: margin 368 with 1013805 samples
Load test passed : margin 368 with 4142659 samples
Store test failed as expected: worst error 2940 with 4298473 samples
Quad:
CPU vendor : GenuineIntel
CPU model : Intel(R) Xeon(R) CPU E7 ...
CPU stepping : ..
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 208 with 11997136 samples
Load3 test passed: margin 812 with 98710 samples
Load test passed : margin 208 with 1259451 samples
Store test failed as expected: worst error 9284 with 1086616 samples
-Andi
next prev parent reply other threads:[~2011-04-18 22:10 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-18 19:32 Andrew Lutomirski
2011-04-18 20:16 ` Linus Torvalds
2011-04-18 20:37 ` Ingo Molnar
2011-04-19 0:38 ` Markus Trippelsdorf
2011-04-18 20:23 ` Colin Walters
2011-04-18 20:27 ` Andrew Lutomirski
2011-04-18 20:35 ` Colin Walters
2011-04-18 20:39 ` Andrew Lutomirski
2011-04-18 22:10 ` Andi Kleen [this message]
2011-04-19 2:15 ` Andrew Lutomirski
2011-04-19 0:49 ` Mihai Donțu
2011-04-19 8:10 ` Frank Kingswood
2011-04-22 14:33 ` Jan Ceuleers
2011-04-19 5:06 George Spelvin
2011-04-19 6:09 ` George Spelvin
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