On 04/03/2013 10:46 AM, Michael Wang wrote: > | 15 GB | 16 | 45110 | | 48091 | > | 15 GB | 24 | 41415 | | 47415 | > | 15 GB | 32 | 35988 | | 45749 | +27.12% > > Very nice improvement, I'd like to test it with the wake-affine throttle > patch later, let's see what will happen ;-) > > Any idea on why the last one caused the regression?
you can change the burst threshold: sysctl_sched_migration_cost, to see what's happen with different value. create a similar knob and tune it. + + if (cpu_rq(this_cpu)->avg_idle < sysctl_sched_migration_cost) + burst_this = 1; + if (cpu_rq(prev_cpu)->avg_idle < sysctl_sched_migration_cost) + burst_prev = 1; + BTW, what's the job thread behaviour of pgbench, guess it has lots of wakeup. what's the work and sleep ratio of pgbench? -- Thanks Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
