Frequency and core voltage adjustment for AMD CPUs.

Sun Aug 30 15:40:19 UTC 2009

Hello,

I did functionality expansion of cpufreq driver for AMD CPUs, "powernow.c"
and "hwpstate.c".
It can change frequency and core voltage from default in each P-states
by definition of device.hints.

Patch file against cpufreq driver:
  http://configure.sh/FreeBSD/cpufreq.html
  http://configure.sh/FreeBSD/cpufreq-j.html (Japanese)

At least, it works well with my FreeBSD box, HP ProLiant ML115 G5.
But, I don't know whether it works with other hardwares.
Can anyone test this patch?
Any comments and suggestions are welcome.

- How to change frequency or core voltage.

  Define difference value from default in /boot/device.hints as follows.

  hint.{drivername}.0.adjfreq=XXX
    CPU frequency(MHz) of difference from default in all P-states.
  hint.{drivername}.0.adjfreqN=XXX
    CPU frequency(MHz) of difference from default in P-state N.
  hint.{drivername}.0.adjvcore=XXX
    CPU core voltage(mV) of difference from default in all P-states.
  hint.{drivername}.0.adjvcoreN=XXX
    CPU core voltage(mV) of difference from default in P-state N.
  *{drivername} is "powernow" or "hwpstate".

  Frequency and core voltage can be defined by an arbitrary value, but it
  is adjusted automatically by the nearest value that CPU allows.
  For example, the driver sets +100MHz if you define "adjfreq=110" when
  frequency step that specified by CPU is 100MHz.

- Example 1

OS : FreeBSD 8.0-BETA2
H/W: HP ProLiant ML115 G5
CPU: Athlon 1640B (2.7GHz)

/boot/device.hints:
========================================================================
hint.powernow.0.adjvcore="-200"
  -> Core voltage is set to -200mV from default in all P-states.
hint.powernow.0.adjfreq="-100"
  -> Frequency is set to -100MHz from default in all P-states.
hint.powernow.0.adjfreq0="0
  -> Frequency is set to default in P-state0.
========================================================================

dmesg:
========================================================================
Copyright (c) 1992-2009 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.0-BETA2 #56: Sun Aug 23 10:34:37 JST 2009
    junichi at shiga.pn.junichi.org:/usr/src/sys/amd64/compile/SHIGA
WARNING: WITNESS option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) Processor 1640B (2700.02-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x70ff2  Stepping = 2
  Features=0x78bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2>
  Features2=0x2001<SSE3,CX16>
  AMD Features=0xea500800<SYSCALL,NX,MMX+,FFXSR,RDTSCP,LM,3DNow!+,3DNow!>
  AMD Features2=0x11d<LAHF,SVM,ExtAPIC,CR8,Prefetch>
real memory  = 2147483648 (2048 MB)
avail memory = 4105457664 (3915 MB)
ACPI APIC Table: <HP     ProLiant>
ioapic0 <Version 1.1> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <HP ProLiant> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
acpi0: reservation of fec00000, 1000 (3) failed
acpi0: reservation of fee00000, 1000 (3) failed
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x2008-0x200b on acpi0
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 25000000 Hz quality 900
....
cpu0: <ACPI CPU> on acpi0
powernow0: <PowerNow! K8> on cpu0
powernow0: P-state0: 2700MHz->2700MHz, 1350mV->1150mV
powernow0: P-state1: 2600MHz->2500MHz, 1325mV->1125mV
powernow0: P-state2: 2400MHz->2300MHz, 1275mV->1075mV
powernow0: P-state3: 2200MHz->2100MHz, 1225mV->1025mV
powernow0: P-state4: 2000MHz->1900MHz, 1175mV->975mV
powernow0: P-state5: 1800MHz->1700MHz, 1125mV->925mV
powernow0: P-state6: 1000MHz->900MHz, 1100mV->900mV
...
========================================================================

Result of "sysctl dev.cpu.0.freq_levels":
========================================================================
dev.cpu.0.freq_levels: 2700/50000 2500/46381 2300/39643 2100/33545 1900/28057 1700/23148 900/12249
========================================================================

- Example 2

OS:  FreeBSD 8.0-BETA3
H/W: HP ProLiant ML115 G5
CPU: Phenom 9850 Black Edition (2.5GHz)

/boot/device.hints:
========================================================================
hint.hwpstate.0.adjfreq0="200"
  -> Frequency is set to +200MHz(over clock) from default in P-state0.
hint.hwpstate.0.adjfreq1="-350"
  -> Frequency is set to -350MHz from default in P-state1.
hint.hwpstate.0.adjvcore1="-175"
  -> Core voltage is set to -175mV from default in P-state1.
========================================================================

dmesg:
========================================================================
Copyright (c) 1992-2009 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.0-BETA3 #0: Mon Aug 24 23:29:36 JST 2009
    junichi at shiga.pn.junichi.org:/usr/src/sys/amd64/compile/SHIGA
WARNING: WITNESS option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Phenom(tm) 9850 Quad-Core Processor (2500.02-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x100f23  Stepping = 3
  Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
  Features2=0x802009<SSE3,MON,CX16,POPCNT>
  AMD Features=0xee500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM,3DNow!+,3DNow!>
  AMD Features2=0x7ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS>
  TSC: P-state invariant
real memory  = 5100273664 (4864 MB)
avail memory = 4105482240 (3915 MB)
ACPI APIC Table: <HP     ProLiant>
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s)
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
ioapic0 <Version 1.1> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <HP ProLiant> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
acpi0: reservation of fec00000, 1000 (3) failed
acpi0: reservation of fee00000, 1000 (3) failed
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x2008-0x200b on acpi0
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 25000000 Hz quality 900
...
cpu0: <ACPI CPU> on acpi0
hwpstate0: P-state0: 2500MHz->2700MHz, 1300mV->1300mV
hwpstate0: P-state1: 1250MHz->900MHz, 1050mV->875mV
hwpstate0: <Cool`n'Quiet 2.0> on cpu0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
...
========================================================================

Result of "sysctl dev.cpu.0.freq_levels":
========================================================================
dev.cpu.0.freq_levels: 2700/30940 900/1848
========================================================================

---
Junichi Satoh <junichi at junichi.org>