1 Nov
2017
1 Nov
'17
9:27 p.m.
On Wed, 1 Nov 2017, David Woodfall wrote:
Frequency scaling is either powersave or performance
on this T420 with
pstates in the kernel, but switching to performance hasn't helped
much. The strange thing is that I have a dual core server running the
same version of slackware, kernel, jack and mplayer and it has no
xruns, even in powersave mode. It's also an intel CPU with pstates.
intel with p-states... performance mode does not mean no speed changes if
you also have "Boost". Performance just raises the lowest speed to rated
speed. Boost may then run faster. Turning boost off does seem to improve
stability, though not as much as powersave to performance does. I think it
is possible by fiddling with all the p-state or cpufreq settings to run at
a steady speed greater than rating. Best watch temperatures though :) My
3.2 Ghz chip will run at 3.4Ghz at 100%cpu on all four cores (compile
Ardour) without over heating for example. That is with no special settings
other than allowing Boost on.
--
Len Ovens
www.ovenwerks.net