Bug 46222

Summary:	CPU speed incorrectly reported
Product:	Base System	Reporter:	Hubert Tournier <hubert>
Component:	i386	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	Closed FIXED
Severity:	Affects Only Me
Priority:	Normal
Version:	Unspecified
Hardware:	Any
OS:	Any

Description Hubert Tournier 2002-12-12 23:20:01 UTC

CPU speed is incorrectly reported : 185 MHz instead of 200 MHz.

Relevant parts of /var/log/messages follows :

--- part1 begins here ---
Nov 25 00:02:40  kernel: Timecounter "i8254"  frequency 1193182 Hz
Nov 25 00:02:40  kernel: Timecounter "TSC"  frequency 184527957 Hz
Nov 25 00:02:40  kernel: CPU: Pentium II/Pentium II Xeon/Celeron (184.53-MHz 686-class CPU)
Nov 25 00:02:40  kernel: Origin = "GenuineIntel"  Id = 0x66a  Stepping = 10
Nov 25 00:02:40  kernel: Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
Nov 25 00:02:40  kernel: acpi0: <TOSHIB 750     > on motherboard
Nov 25 00:02:40  kernel: Timecounter "ACPI-safe"  frequency 3579545 Hz
Nov 25 00:02:40  kernel: acpi_timer0: <24-bit timer at 3.579545MHz> port 0xfe08-0xfe0b on acpi0
Nov 25 00:02:41  kernel: pmtimer0 on isa0
Nov 25 00:02:41  kernel: Timecounters tick every 10.000 msec
--- part1 ends here ---

How-To-Repeat: 
Reboot.

Comment 1 dwmalone freebsd_committer

2002-12-23 10:57:24 UTC

State Changed
From-To: open->feedback

The speed of the CPU is actually measured by seeing how many 
instructions are executed in an interval measured by the real time 
timer. This suggests that either your CPU is running slow or the 
timer is running fast. 

The CPU could be running slow because of APM or ACPI settings 
reducing power consumption by slowing the CPU. Can you look into 
this possibility? 

David.

Comment 2 Kris Kennaway freebsd_committer

2003-07-13 00:18:27 UTC

State Changed
From-To: feedback->closed

Feedback timeout