Messages in this thread | | | Date | Sat, 7 Jan 2006 14:37:22 -0800 | From | Andrew Morton <> | Subject | Re: PowerPC fastpaths for mutex subsystem |
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Joel Schopp <jschopp@austin.ibm.com> wrote: > > This is the second pass at optimizing the fastpath for the new mutex subsystem > on PowerPC. I think it is ready to be included in the series with the other > mutex patches now. Tested on a 4 core (2 SMT threads/core) Power5 machine with > gcc 3.3.2. > > Test results from synchro-test.ko: > > All tests run for default 5 seconds > Threads semaphores mutexes mutexes+attached > 1 63,465,364 58,404,630 62,109,571 > 4 58,424,282 35,541,297 37,820,794 > 8 40,731,668 35,541,297 40,281,768 > 16 38,372,769 37,256,298 41,751,764 > 32 38,406,895 36,933,675 38,731,571 > 64 37,232,017 36,222,480 40,766,379 >
Doens't this mean that the sped-up mutexes are still slower than semaphores? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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