ports/154474: [PATCH] cpupowerd cannot calculate FIDs from dev.cpu.x.freq_levels
Thomas Bach
bachth at uni-mainz.de
Thu Feb 3 00:00:27 UTC 2011
>Number: 154474
>Category: ports
>Synopsis: [PATCH] cpupowerd cannot calculate FIDs from dev.cpu.x.freq_levels
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-ports-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Feb 03 00:00:26 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Thomas Bach
>Release: 8.2-PRERELEASE
>Organization:
>Environment:
# uname -a
FreeBSD taris.fritz.box 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #0: Sun Jan 30 14:50:11 CET 2011 root at taris.fritz.box:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
cpupword tries to determine FIDs from the frequencies from dev.cpu.x.freq_levels
which reports wrong levels:
# sysctl dev.cpu.0.freq_levels
dev.cpu.0.freq_levels: 2500/50000 2400/46099 2200/38878 2000/32400 1800/26625 1575/23296 1350/19968 1125/16640 1000/12800 875/11200 750/9600 625/8000 500/6400 375/4800 250/3200 125/1600
to calculate the actual fid it executes:
# grep '\-\ 8' *
msr_amd.c: *fid = (frequency/100) - 8;
Returning '-7' when coming to the frequency 125:
# /usr/local/sbin/cpupowerd -s
cpupowerd 0.2.1 written by Markus Strobl.
WARNING: This program could cause damage to your Hardware!
FID (-7) out of range!
Initialisation failed!
>How-To-Repeat:
Running 'cpupowerd -s' on an amd64
# cat /usr/compat/linux/proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 1
model name : AMD Athlon(tm) Dual Core Processor 4850e
stepping : 2
processor : 1
vendor_id : AuthenticAMD
cpu family : 15
model : 1
model name : AMD Athlon(tm) Dual Core Processor 4850e
stepping : 2
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 b19 mmx fxsr xmm sse2
cpu MHz : 2506.52
bogomips : 2506.52
(Yet I don't know how to extract the information with freebsd commands :P)
>Fix:
dev.powernow.0.freq_settings gives the right possible frequencies on my system/cpu.
So the quick fix is to change the line
snprintf(levels_sysctl, sizeof(levels_sysctl), "dev.cpu.%d.freq_levels", mastercpuid);
to
snprintf(levels_sysctl, sizeof(levels_sysctl), "dev.powernow.%d.freq_settings", mastercpuid);
# diff /tmp/cpu_bsd.c cpu_bsd.c
426c426
< snprintf(levels_sysctl, sizeof(levels_sysctl), "dev.powernow.%d.freq_settings", mastercpuid);
---
> snprintf(levels_sysctl, sizeof(levels_sysctl), "dev.cpu.%d.freq_levels", mastercpuid);
Anyway, having dev.cpu.0.freq_levels reporting the right frequencies would be much cleaner.
>Release-Note:
>Audit-Trail:
>Unformatted:
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