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Message-ID: <20080817213036.GA12838@Krystal> Date: Sun, 17 Aug 2008 17:30:36 -0400 From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: "H. Peter Anvin" <hpa@...or.com>, Jeremy Fitzhardinge <jeremy@...p.org>, Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar <mingo@...e.hu>, Joe Perches <joe@...ches.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH] Fair low-latency rwlock v5 (updated benchmarks) Here are some updated benchmarks of the rwlock v5, showing [min,avg,max] delays in non-contended and contended cases : The test module is available at : http://ltt.polymtl.ca/svn/trunk/tests/kernel/test-fair-rwlock.c ** Performance tests Dual quad-core Xeon 2.0GHz E5405 * Lock contention delays, per context, 60s test ** get_cycles calibration ** get_cycles takes [min,avg,max] 78,79,84 cycles, results calibrated on avg ** Single writer test, no contention ** writer_thread/0 iterations : 964054, lock delay [min,avg,max] 149,157,5933 cycles ** Single reader test, no contention ** reader_thread/0 iterations : 37591763, lock delay [min,avg,max] 59,65,21383 cycles ** Multiple readers test, no contention ** reader_thread/0 iterations : 9062919, lock delay [min,avg,max] 59,921,42593 cycles reader_thread/1 iterations : 9014846, lock delay [min,avg,max] 59,928,42065 cycles reader_thread/2 iterations : 9394114, lock delay [min,avg,max] 59,897,46877 cycles reader_thread/3 iterations : 9459081, lock delay [min,avg,max] 59,896,38207 cycles ** High contention test ** 4 thread readers (no delay loop) 2 thread trylock readers (no delay loop) 2 thread writers (10us period) 2 thread trylock writers (10us period) 1 periodical interrupt readers on 7/8 cpus (IPIs). 1 periodical interrupt trylock readers on 7/8 cpus (IPIs). writer_thread/0 iterations : 2864146, lock delay [min,avg,max] 179,9493,102563 cycles writer_thread/1 iterations : 2986492, lock delay [min,avg,max] 179,9332,66923 cycles trylock_writer_thread/0 iterations : 12789892, successful iterations : 3257203 trylock_writer_thread/1 iterations : 12747023, successful iterations : 3268997 reader_thread/0 iterations : 13091562, lock delay [min,avg,max] 59,5806,141053 cycles reader_thread/1 iterations : 12574027, lock delay [min,avg,max] 59,5706,141839 cycles reader_thread/2 iterations : 12805706, lock delay [min,avg,max] 59,5738,138725 cycles reader_thread/3 iterations : 13352731, lock delay [min,avg,max] 59,5606,137585 cycles trylock_reader_thread/0 iterations : 63135422, successful iterations : 15204229 trylock_reader_thread/1 iterations : 62306024, successful iterations : 15123824 interrupt_reader_thread/0 iterations : 559 interrupt readers on CPU 0, lock delay [min,avg,max] 167,984,16271 cycles interrupt readers on CPU 1, lock delay [min,avg,max] 179,1185,9125 cycles interrupt readers on CPU 2, lock delay [min,avg,max] 155,940,8081 cycles interrupt readers on CPU 3, lock delay [min,avg,max] 83,1158,13355 cycles interrupt readers on CPU 4, lock delay [min,avg,max] 77,863,6371 cycles interrupt readers on CPU 5, lock delay [min,avg,max] 173,1169,16331 cycles interrupt readers on CPU 6, lock delay [min,avg,max] 155,834,8705 cycles interrupt readers on CPU 7, lock delay [min,avg,max] 173,1159,10115 cycles trylock_interrupt_reader_thread/0 iterations : 570 trylock interrupt readers on CPU 0, iterations 280, successful iterations : 239 trylock interrupt readers on CPU 1, iterations 590, successful iterations : 538 trylock interrupt readers on CPU 2, iterations 431, successful iterations : 372 trylock interrupt readers on CPU 3, iterations 605, successful iterations : 570 trylock interrupt readers on CPU 4, iterations 659, successful iterations : 570 trylock interrupt readers on CPU 5, iterations 616, successful iterations : 570 trylock interrupt readers on CPU 6, iterations 675, successful iterations : 570 trylock interrupt readers on CPU 7, iterations 597, successful iterations : 561 Mathieu -- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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