Hi John, The "kstat cstate" shows your system is now using C1 and C3.
Your BIOS is *not* enabling C2. Many BIOS do not enable C2 by default due to a bug in another OS. The BIOS option to enable C2 is often obscurely worded, so you may have to poke around in the BIOS options to find it. The (Auto, C1, C1E, C3, C6) BIOS setting you mentioned is the "package level C-state" not per-core level C-state. This experiment shows we need to add this cpupm_intel_pdccap bit. It is described here: http://www.google.com/url?sa=t&source=web&ct=res&cd=6&url=http%3A%2F%2Fdownload.intel.com%2Ftechnology%2FIAPC%2Facpi%2Fdownloads%2F30222305.pdf&ei=bf-nSvSEJYzUtgPI9527BQ&rct=j&q=ACPI+Processor+Driver+Capabilities&usg=AFQjCNED1zOvuKuCISL5P_Q2xClQ_P714A Aubrey, should we be using the _OSC object instead of _PDC with ACPI 3.0 and above? Regards, Bill On 09/09/09 05:30, John Martin wrote: > Li, Aubrey wrote: >> >> It looks like the BIOS only support native deep cstate method. >> We probably need to enable PDC.bit9. >> >> John, could you please help to verify it on your system? >> >> 1) reboot the system and enter kmdb >> >> 2) set a breakpoint at cpu_acpi_write_pdc() >> [0]> cpu_acpi_write_pdc:b >> >> 3) continue to hit the breakpoint >> [0]> :c >> >> 4) when the breakpoint is hit, change "cpupm_intel_pdccap" to 0xBBF. >> [0]> cpupm_intel_pdccap/W 0xBBF >> >> 5) continue to boot the system. >> > FWIW, on each of the eight i7 920 "cpus", 0xbbf replaced 0x9bf. > > This experiment was more complex than anticipated. The first breakpoint > went fine. On the second breakpoint ([1]> ) no input was accepted > on the USB console keyboard. Switching this keyboard to the PS/2 > input with a dongle fixed the problem. > > After the system booted, powertop fails with: > > powertop: ../common/cpufreq.c : cannot open dtrace library: DTrace > cannot be used when kernel debugger is active > > but "kstat cstate" now produces output (it didn't before). If it > matters, > the SBIOS option is still set to "Auto". > > # kstat cstate > module: cstate instance: 1 name: > c1 class: misc > address_space_id FFixedHW > crtime 201.053737219 > latency 1 > power 1000 > snaptime 618.987573382 > > module: cstate instance: 1 name: > c3 class: misc > address_space_id FFixedHW > crtime 201.053738694 > latency 96 > power 350 > snaptime 618.987763894 > > module: cstate instance: 2 name: > c1 class: misc > address_space_id FFixedHW > crtime 235.491583585 > latency 1 > power 1000 > snaptime 618.987868627 > > module: cstate instance: 2 name: > c3 class: misc > address_space_id FFixedHW > crtime 235.491585306 > latency 96 > power 350 > snaptime 618.987962843 > > module: cstate instance: 3 name: > c1 class: misc > address_space_id FFixedHW > crtime 254.080557069 > latency 1 > power 1000 > snaptime 618.988062766 > > module: cstate instance: 3 name: > c3 class: misc > address_space_id FFixedHW > crtime 254.080558851 > latency 96 > power 350 > snaptime 618.988155771 > > module: cstate instance: 4 name: > c1 class: misc > address_space_id FFixedHW > crtime 301.460281258 > latency 1 > power 1000 > snaptime 618.98825552 > > module: cstate instance: 4 name: > c3 class: misc > address_space_id FFixedHW > crtime 301.460282866 > latency 96 > power 350 > snaptime 618.988349078 > > module: cstate instance: 5 name: > c1 class: misc > address_space_id FFixedHW > crtime 354.306818526 > latency 1 > power 1000 > snaptime 618.988449423 > > module: cstate instance: 5 name: > c3 class: misc > address_space_id FFixedHW > crtime 354.306820203 > latency 96 > power 350 > snaptime 618.988542142 > > module: cstate instance: 6 name: > c1 class: misc > address_space_id FFixedHW > crtime 373.751687887 > latency 1 > power 1000 > snaptime 618.988660284 > > module: cstate instance: 6 name: > c3 class: misc > address_space_id FFixedHW > crtime 373.751690036 > latency 96 > power 350 > snaptime 618.988753932 > > module: cstate instance: 7 name: > c1 class: misc > address_space_id FFixedHW > crtime 388.831011112 > latency 1 > power 1000 > snaptime 618.988854217 > > module: cstate instance: 7 name: > c3 class: misc > address_space_id FFixedHW > crtime 388.831013099 > latency 96 > power 350 > snaptime 618.988947075 > > # > > > > > > _______________________________________________ > pm-discuss mailing list > pm-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/pm-discuss
