Peter Hessler [phess...@openbsd.org] wrote: > On 2014 Oct 17 (Fri) at 12:12:07 +0100 (+0100), Kevin Chadwick wrote: > :On Thu, 16 Oct 2014 19:55:00 -0600 (MDT) > :Ted Unangst wrote: > : > :> remove performance throttling code from here, use the kernel version > :> instead. this effectively kills -C, though the option is kept for compat. > : > :>> redo the performance throttling in the kernel. > :>> introduce a new sysctl, hw.perfpolicy, that governs the policy. > :>> when set to anything other than manual, hw.setperf then becomes read > :>> only. phessler was heading in this direction, but this is slightly > :>> different. :) > : > :Is the default hw.perfpolicy equivalent to -C or should > :I investigate the options when I upgrade? > : > :Thanks, > : Kc > : > > The default has the same semantics as -C. -A was a hack to work around > the bugs that in kernel performance throttling fixed. >
To clarify Peter's answer; The default hw.perfpolicy is 'manual' which is still the same as before. (Nothing changes if you upgrade -current, you can still control hw.setperf by hand.) Once you set the policy to 'auto' then it is the same as what apmd tried to do from userland with -C. But it works for more general purposes, due to reduced latency of moving the power mgmt logic into the kernel. Chris
