On Sun, Apr 08, 2018 at 12:11:39PM +0300, Thanos Baloukas wrote:
> On 08/04/2018 06:30 πμ, Ken Moffat wrote:
> > On Sun, Apr 08, 2018 at 04:01:11AM +0300, Thanos Baloukas wrote:
> > > On 07/04/2018 11:57 μμ, Ken Moffat wrote:
> > > > 
> > > 
> > > The only problem the machine had was freezing on idle. In the beginning
> > > I disabled the cool 'n quiet in the bios and that solved the problem.
> > > Then I found this bug report,
> > > 
> > > https://bugzilla.kernel.org/show_bug.cgi?id=196683
> > > 
> > 
> > I've been running cool 'n quiet without any problems (apart from
> > this) and using lm_sensors I can see CPU frequencies at 3592 MHz on
> > all cores, or a bit above 3600 on only one core - for a nominal max
> > frequency of 3500 - and much lower frequencies when less-busy)
> > 
> > To be clear, you turned off C6 if that is available as a bios
> > option, OR added CONFIG_RCU_NO_CB_CPU and added a boot argument of
> > rcu_nocbs=0-3 ?
> > 
> Didn't play with C6 at all. Using a kernel with
> 
> # RCU Subsystem
> CONFIG_TREE_RCU=y
> # CONFIG_RCU_EXPERT is not set
> CONFIG_SRCU=y
> CONFIG_TREE_SRCU=y
> CONFIG_TASKS_RCU=y
> CONFIG_RCU_STALL_COMMON=y
> CONFIG_RCU_NEED_SEGCBLIST=y
> CONFIG_RCU_NOCB_CPU=y
> CONFIG_HAVE_RCU_TABLE_FREE=y
> # RCU Debugging
> # CONFIG_PROVE_RCU is not set
> # CONFIG_RCU_PERF_TEST is not set
> CONFIG_RCU_TORTURE_TEST=m
> CONFIG_RCU_CPU_STALL_TIMEOUT=60
> # CONFIG_RCU_TRACE is not set
> # CONFIG_RCU_EQS_DEBUG is not set
> 
> and rcu_nocbs=0-3 on kernel command line was enough.
> 

Thanks.  Tried that, but it did not help.  I also tried logging
output from top and sensors every 5 seconds (that took two goes,
first time I fubar'd and emptied the log on every pass through the
loop).  I noticed that 5 seconds before the crash, one core was
running at just over 3.7 GHz (boosted) and the others were slowing
down.

So I decided to try turning of c6 states anyway, using zenstates.py
(it's on github with some other zen stuff) - bad mistake : the Xorg
display went blank while I was watching, but the box did not reboot
and neither of the front-panel switches (reboot, on/off) worked.

For the moment I'm going to step away from this (I've got something
else to install and test here).

ĸen
-- 
In my seventh decade astride this planet, and as my own cells degrade,
there are some things I cannot do now: skydiving, marathon running,
calculus. I couldn't do them in my 20s either, so no big loss.
            -- Derek Smalls, formerly of Spinal Tap
-- 
http://lists.linuxfromscratch.org/listinfo/blfs-dev
FAQ: http://www.linuxfromscratch.org/blfs/faq.html
Unsubscribe: See the above information page

Reply via email to