* Pallipadi, Venkatesh <[EMAIL PROTECTED]> [2008-02-26 09:45:51]: > > > >-----Original Message----- > >From: [EMAIL PROTECTED] > >[mailto:[EMAIL PROTECTED] On Behalf Of Martin Wilck > >Sent: Tuesday, February 26, 2008 5:56 AM > >To: [email protected] > >Subject: Re: [Discuss] SPECpower Linux vs. Windows > > > >Pallipadi, Venkatesh wrote: > > > >> We have seen sched_mc_power_savings mentioned above help SPECpower. > >> Another _hack_ that seems to help the benchmark is to increase the > >> ondemand sampling rate at > >> /sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate. You may > >> have to try different values upto max to get best number. > > > >Thanks. Is there a similar setting for the cpuidle governor? > > > > No. There are no tunables for idle governor at present. One thing you > can try is to limit the max_cstate at boot time, with boot option > processor.max_cstate=1 and use only C1. How many C-states are supported
Hi Venki, Wouldn't limiting C-states further reduce the power savings? Are you hinting that this may actually improve performance by reducing the wakeup latency and thereby give a better SPECpower benchmark? --Vaidy _______________________________________________ Discuss mailing list [email protected] http://mail.lesswatts.org/mailman/listinfo/discuss
