Messages in this thread | | | Date | Sat, 18 Nov 2006 00:46:32 +0530 | From | "Dhaval Giani" <> | Subject | cpufreq userspace governor does not reflect changes |
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Hey there,
I finally managed to get cpufreq working. And while using the userspace governor, I came up with a curious output.
[root@localhost cpufreq]# cat * 0 1862000 1596000 1862000 1596000 ondemand userspace performance 1862000 acpi-cpufreq userspace 1862000 1596000 1862000 cat: stats: Is a directory [root@localhost cpufreq]# echo 1596000 > scaling_setspeed [root@localhost cpufreq]# cat * 0 1862000 1596000 1862000 1596000 ondemand userspace performance 0 acpi-cpufreq userspace 1862000 1596000 0 cat: stats: Is a directory [root@localhost cpufreq]#
This is on a Core 2 Duo E6300 processor. The dmesg looks like this,
cpufreq-core: setting new policy for CPU 0: 1596000 - 1862000 kHz acpi-cpufreq: acpi_cpufreq_verify freq-table: request for verification of policy (1596000 - 1862000 kHz) for cpu 0 freq-table: verification lead to (1596000 - 1862000 kHz) for cpu 0 acpi-cpufreq: acpi_cpufreq_verify freq-table: request for verification of policy (1596000 - 1862000 kHz) for cpu 0 freq-table: verification lead to (1596000 - 1862000 kHz) for cpu 0 cpufreq-core: new min and max freqs are 1596000 - 1862000 kHz cpufreq-core: governor switch cpufreq-core: __cpufreq_governor for CPU 0, event 2 cpufreq-core: __cpufreq_governor for CPU 0, event 1 userspace: managing cpu 0 started (1596000 - 1862000 kHz, currently 1862000 kHz) cpufreq-core: governor: change or update limits cpufreq-core: __cpufreq_governor for CPU 0, event 3 userspace: limit event for cpu 0: 1596000 - 1862000 kHz,currently 1862000 kHz, last set to 1862000 kHz cpufreq-core: target for CPU 0: 1862000 kHz, relation 0 acpi-cpufreq: acpi_cpufreq_target 1862000 (0) freq-table: request for target 1862000 kHz (relation: 0) for cpu 0 freq-table: target is 0 (1862000 kHz, 0) acpi-cpufreq: Already at target state (P0) printk: 30 messages suppressed. userspace: cpufreq_set for cpu 0, freq 1596000 kHz cpufreq-core: target for CPU 0: 1596000 kHz, relation 0 acpi-cpufreq: acpi_cpufreq_target 1596000 (0) freq-table: request for target 1596000 kHz (relation: 0) for cpu 0 freq-table: target is 1 (1596000 kHz, 9) cpufreq-core: notification 0 of frequency transition to 0 kHz userspace: saving cpu_cur_freq of cpu 0 to be 0 kHz cpufreq-core: notification 1 of frequency transition to 0 kHz userspace: saving cpu_cur_freq of cpu 0 to be 0 kHz [root@localhost cpufreq]#
How can I verify what is the processor speed I'm running at? And is this the result expected? (Also is this how I change the frequency in a multi-core system? Googling did not really get me anything) As a side note, I'm also curious to know whether multi core systems support the processors running at multiple clock speeds? (Somewhere I remember understanding the code to add all the processors to be added to affected_cpus map, and if any cpu in that one is affected, all of them are. Did i understand it right?)
Thanks and regards Dhaval Giani - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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