On Mon, 3 Mar 2008 01:18:13 +0530 Vaidyanathan Srinivasan <svaidy@xxxxxxxxxxxxxxxxxx> wrote: > Hi, > > I am trying to play around with the tickless kernel and > sched_mc_power_savings tunables to increase the idle duration of the > CPU in an SMP server. sched_mc_power_savings provides good > consolidation of long running jobs when the system is lightly loaded. > However I am interested to see CPU idle times for couple minutes on > atleast few CPUs in an completely idle SMP system. > > I have posted related instrumentation results at > http://lkml.org/lkml/2008/1/8/243 > > The experimental setup is identical. Just that I have tried to > collect more data and also bias the wakeup logic. > > The kernel is 2.6.25-rc3 with NO_HZ, SCHED_MC, HIGH_RES_TIMERS, and > HPET turned on. > > I have tried to collect interesting data from tick-sched.c, sched.c > and softirq.c. > > As suggested by Ingo in the previous thread, I have hacked the sched.c > try_to_wake_up logic so that I can force all wake-ups to happen on > CPU0. This is just and experiment, in reality we will have to > carefully choose a domain and CPU to bias all wakeups on an idle > system. please show us powertop -d output; that way we can at least see sort of what is going on... _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
