linux-kernel - cpuinfo shows wrong MHz value

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <200902142217.51655.jplatte@naasa.net>
Date:	Sat, 14 Feb 2009 22:17:48 +0100
From:	Joerg Platte <jplatte@...sa.net>
To:	linux-kernel@...r.kernel.org
Subject: cpuinfo shows wrong MHz value

I'm running kernel 2.6.28.4 and /proc/cpuinfo and powertop and vmware are 
unable to detect the correct speed (1.6 GHz) of the processor:

cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 1
model name      : Intel(R) Pentium(R) 4 CPU 1.60GHz
stepping        : 2
cpu MHz         : 13000.000
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pebs bts
bogomips        : 3197.21
clflush size    : 64
power management:

According to dmesg the kernel detects the CPU correctly during bootup:

Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 16384 bytes)
TSC: PIT calibration matches PMTIMER. 1 loops
Detected 1598.609 MHz processor.

IIRC this behavior started some kernels ago, I can't remember which kernel it 
was. Is it possible that the ACPI information is wrong?

regards,
Jörg
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/