diff options
| author | Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> | 2009-01-28 12:51:09 +0900 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2009-01-29 17:06:03 -0800 |
| commit | 754ef0cd65faac4840ada4362bda322d9a811fbf (patch) | |
| tree | ecbefbee7ab44bd915a2e2cceeebab2ac7a382ef /arch/x86/kernel/cpu | |
| parent | 5ee810072175042775e39bdd3eaaa68884c27805 (diff) | |
x86: fix debug message of CPU clock speed
Impact: Fixes incorrect printk
LOCAL APIC is corrected by PM-Timer, when SMI occurred while LOCAL APIC is calibrated.
In this case, LOCAL APIC debug message(Boot with apic=debug) is displayed correctly,
however, CPU clock speed debug message is displayed wrongly .
When SMI occured on my machine, which has 1.6GHz CPU, CPU clock speed is displayed
3622.0205 MHz as follow.
CPU0: Intel(R) Xeon(R) CPU 5110 @ 1.60GHz stepping 06
Using local APIC timer interrupts.
calibrating APIC timer ...
... lapic delta = 3773130
... PM timer delta = 812434
APIC calibration not consistent with PM Timer: 226ms instead of 100ms
APIC delta adjusted to PM-Timer: 1662420 (3773130)
..... delta 1662420
..... mult: 71411249
..... calibration result: 265987
..... CPU clock speed is 3622.0205 MHz. =====> here
..... host bus clock speed is 265.0987 MHz.
This patch fixes to displaying CPU clock speed correctly as follow.
CPU0: Intel(R) Xeon(R) CPU 5110 @ 1.60GHz stepping 06
Using local APIC timer interrupts.
calibrating APIC timer ...
... lapic delta = 3773131
... PM timer delta = 812434
APIC calibration not consistent with PM Timer: 226ms instead of 100ms
APIC delta adjusted to PM-Timer: 1662420 (3773131)
TSC delta adjusted to PM-Timer: 159592409 (362220564)
..... delta 1662420
..... mult: 71411249
..... calibration result: 265987
..... CPU clock speed is 1595.0924 MHz.
..... host bus clock speed is 265.0987 MHz.
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/cpu')
0 files changed, 0 insertions, 0 deletions