[ltp] Temperature increase after S2Ram
Sun, 07 Jul 2013 10:52:51 +0200
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.
> and turbostat
$ sudo ./turbostat -S
No invariant TSC
> to make sure the cores are idling
> properly (i.e. hitting c3 and c6), as well.