Ingo Molnar wrote on Sunday, April 03, 2005 11:24 PM > great! How long does the benchmark take (hours?), and is there any way > to speed up the benchmarking (without hurting accuracy), so that > multiple migration-cost settings could be tried? Would it be possible to > try a few other values via the migration_factor boot option, in 0.5 msec > steps or so, to find the current sweet spot? It used to be at 11 msec > previously, correct?
It take days, each experiment is 5 hours. Previous experiments on 2.6.8 shows that the sweet spot was 12.5ms. This time on 2.6.11, it got pushed into 16 ms. Results comparing to 10ms: 8 ms -0.3% 10 ms -- 12 ms +0.11% 16 ms +0.14% 20 ms +0.06% 12ms and up all has about 1.5% idle time. We are not anywhere near the limits on what the disk storage can deliver. So there is a potential to to tune/optimize the scheduler and reap these extra idle time. - Ken - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/