Messages in this thread | | | Date | Tue, 19 Apr 2011 00:10:51 +0200 | From | Andi Kleen <> | Subject | Re: [RFT] Please test rdtsc on various x86-64 hardware (app included) |
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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
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