Li, Aubrey wrote: > Hi Detlef, > > Detlef Drewanz wrote: > > >> Eric, >> thanks for this workaround. Yes this works and it works also after >> suspend/resume. So I see now in powertop the frequency changing >> between 800 and 2001 Mhz in event mode. >> >> Thanks. >> ... and if 111b will be the final build for osol2009.06 this >> workaround could be part of the release notes ... >> > > We have a new version of powertop to fix frequency residency bug. > Rafael can help you to get a copy. I just want to see the percent of > each frequency residency and make sure the highest frequency residency > is not too high with the change when idle. > Right, there's a couple of issues, the first is a CPUPM policy issue, where the system can be too conservative about when to clock down in the face of ambient system activity..this is the issue for which I gave you a workaround.
The other issue is observability related...that PowerTOP may not show fractional residency over a sampling interval (which is the frequency residency bug Aubrey mentioned). The two are related in that the second can make the first seem worse. ;) Thanks, -Eric
