Messages in this thread | | | From | "Doug Smythies" <> | Subject | RE: [RFT][PATCH v7 5/8] cpuidle: Return nohz hint from cpuidle_select() | Date | Wed, 21 Mar 2018 11:23:22 -0700 |
| |
On 2018.03.21 11:00 Thomas Ilsche wrote: > On 2018-03-21 15:36, Rafael J. Wysocki wrote: >> >> So please disregard this one entirely and take the v7.2 replacement >> instead of it:https://patchwork.kernel.org/patch/10299429/ >> >> The current versions (including the above) is in the git branch at >> >> git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git \ >> idle-loop-v7.2 > > With v7.2 (tested on SKL-SP from git) I see similar behavior in idle > as with v5: several cores which just keep the sched tick enabled. > Worse yet, some go only in C1 (not even C1E!?) despite sleeping the > full sched tick. > The resulting power consumption is ~105 W instead of ~ 70 W. > > https://wwwpub.zih.tu-dresden.de/~tilsche/powernightmares/v7_2_skl_sp_idle.png > > I have briefly ran v7 and I believe it was also affected.
I am not able to repeat your issues anymore. Idle powers were fine with V7, on my test computer. I have not done thorough idle tests with V7.2, but they looked O.K.
As for the high frequency loop stuff, I no longer see any issues there either. I tried several loops frequencies, and did one for a couple of hours.
I'll try again later today, as there is a test running now (frequency sweep) that takes about 4 hours.
... Doug
| |