https://bugzilla.kernel.org/show_bug.cgi?id=58761
Summary: related_cpus truncated with acpi-cpufreq driver on
kernel 3.9.3
Product: ACPI
Version: 2.5
Kernel Version: 3.9.3
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Processors
AssignedTo: acpi_config-process...@kernel-bugs.osdl.org
ReportedBy: jean-philippe.hal...@exascale-computing.eu
Regression: No
Created an attachment (id=102441)
--> (https://bugzilla.kernel.org/attachment.cgi?id=102441)
cpufreq-info trace
Hello,
I have just installed the 3.9.3 kernel on my Debian 7 installation.
Linux 3.9.3-exa #7 SMP Fri May 24 11:12:58 CEST 2013 x86_64 GNU/Linux
CPU Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz (Ivy Bridge)
Since then, the related_cpus file in
/sys/devices/system/cpu/cpu*/cpufreq/related_cpus just returns the id of the
current core:
/sys/devices/system/cpu/cpu0/cpufreq/related_cpus contains 0
/sys/devices/system/cpu/cpu6/cpufreq/related_cpus contains 6 etc
I read on an archive thread
(http://lkml.indiana.edu/hypermail/linux/kernel/1303.3/00144.html) that this
could happen when the new intel_pstate driver is activated, but I have
deactivated it in the kernel options. I have attached my cpufreq-info trace
which proves I am using the default acpi-cpufreq driver.
Therefore, there must be some problem with related_cpus when using the
acpi-cpufreq driver.
Here is a listing of my files in /sys/devices/system/cpu/cpu0/cpufreq/:
affected_cpus:0
bios_limit:3401000
cpuinfo_cur_freq:3401000
cpuinfo_max_freq:3401000
cpuinfo_min_freq:1600000
cpuinfo_transition_latency:10000
related_cpus:0
scaling_available_frequencies:3401000 3400000 3300000 3100000 3000000 2900000
2800000 2600000 2500000 2400000 2200000 2100000 2000000 1900000 1700000 1600000
scaling_available_governors:conservative userspace powersave ondemand
performance
scaling_cur_freq:3401000
scaling_driver:acpi-cpufreq
scaling_governor:ondemand
scaling_max_freq:3401000
scaling_min_freq:1600000
scaling_setspeed:<unsupported>
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