On Thursday, May 29, 2014 07:27:34 PM Greg Kroah-Hartman wrote: > On Wed, May 28, 2014 at 09:59:45AM +0200, Johan Hovold wrote: > > [ +CC: Greg, Doug, Stratos, Yuyang ] > > > > On Wed, May 21, 2014 at 11:00:51AM +0200, Johan Hovold wrote: > > > On Wed, May 07, 2014 at 07:10:49AM -0700, Dirk Brandewie wrote: > > > > On 05/06/2014 10:40 PM, Viresh Kumar wrote: > > > > > Cc'ing Dirk who is taking care of intel-pstate driver. > > > > > > > > > > > > > Thanks Viresh I had seen this thread. > > > > > > > > I am looking into it > > > > > > Any updates on this, Dirk? 3.14 is still basically unusable with the > > > intel_pstate driver. > > > > > > Any fixes or workarounds posted elsewhere that I can apply in the > > > meantime? > > > > Another week and still no reply, Dirk? > > > > I tried applying your (rejected) patch "intel_pstate: Remove C0 > > tracking" posted here: > > > > https://lkml.org/lkml/2014/5/8/574 > > > > to v3.14.4 and it fixes the problem as expected. > > > > So we have a commit fcb6a15c2e7e ("intel_pstate: Take core C0 time into > > account for core busy calculation") that went into v3.14-rc2 (and was > > even marked for *stable*) that first broke Greg KH's system: > > > > https://lkml.org/lkml/2014/2/19/626 > > > > That was apparently fixed by e66c17683746 ("intel_pstate: Change > > busy calculation to use fixed point math."), but still left v3.14 > > basically unusable for lower-intensity workloads such as my > > bash-completion example and other reported regressions: > > > > https://bugzilla.kernel.org/show_bug.cgi?id=75121 > > > > Sure there may be issues with v3.13 not hitting the lowest frequencies > > but at least the system was *usable*. > > > > In my opinion there's really no other option than to restore the 3.13 > > behaviour by effectively reverting fcb6a15c2e7e ("intel_pstate: Take > > core C0 time into account for core busy calculation") until you have > > figured out a way to take C0 into account without breaking things too > > badly. > > Dirk has posted some patches, do they fix the problem for you? I'm queuing up this series for 3.16, BTW. Rafael -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
