[ltp] Temperature increase after S2Ram
Henrique de Moraes Holschuh
Mon, 8 Jul 2013 00:07:16 -0300
On Sun, 07 Jul 2013, Paul Bolle wrote:
> On Sun, 2013-07-07 at 02:47 -0300, Henrique de Moraes Holschuh wrote:
> > This is not the first report that 3.10 is a dud. Make extremely sure you
> > have _NOT_ enabled the new "full tickless" mode, that thing is broken to
> > kingdon come [either that, or it gets all zombies to come out in the open].
> I currently use
> $ grep NO_HZ /boot/config-3.10.0-1.local0.fc18.x86_64
> # CONFIG_NO_HZ_FULL is not set
> # CONFIG_RCU_FAST_NO_HZ is not set
> So the new full tickless mode is disabled, isn't it?
> > Check with powertop
> Somehow it seems powertop triggers Heisenbug behavior! If the second
> core is apparently stuck at 2 GHz, and I start powertop to see what's
> going on, the second core will again drop down to 800 MHz, eventually.
> But quitting powertop makes the second core jump to 2 GHz again (judging
> by /proc/cpuinfo's output, that is).
> That is strange! So let's assume for now that I see patterns that just
> aren't there. Ie, this needs more testing on my side.
Nah, let's assume 3.10 is borked. Please check whether the latest 3.9.x
works well for you...
> > and turbostat
> $ sudo ./turbostat -S
> No invariant TSC
I see. Can powertop show idle states on that box? If it does, keep an eye
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