Messages in this thread | | | Date | Wed, 18 Oct 2006 21:43:16 +0200 (CEST) | From | Krzysztof Oledzki <> | Subject | 3.2GHz cpus with cpufreq become 2.8GHz |
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Hello,
I have just noticed that enabling cpufreq on my Dell PowerEdge 1425SC changes my secondary cpu clock to 2.8GHz.
# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Xeon(TM) CPU 3.20GHz stepping : 3 cpu MHz : 3200.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 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 pbe nx lm constant_tsc pni monitor ds_cpl cid cx16 xtpr bogomips : 6403.72
processor : 1 vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Xeon(TM) CPU 3.20GHz stepping : 3 cpu MHz : 3200.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 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 pbe nx lm constant_tsc pni monitor ds_cpl cid cx16 xtpr bogomips : 6400.24
processor : 2 vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Xeon(TM) CPU 3.20GHz stepping : 3 cpu MHz : 2800.000 cache size : 2048 KB physical id : 3 siblings : 2 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 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 pbe nx lm constant_tsc pni monitor ds_cpl cid cx16 xtpr bogomips : 6400.30
processor : 3 vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Xeon(TM) CPU 3.20GHz stepping : 3 cpu MHz : 2800.000 cache size : 2048 KB physical id : 3 siblings : 2 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 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 pbe nx lm constant_tsc pni monitor ds_cpl cid cx16 xtpr bogomips : 6400.29
According to cpuinfo the primary CPU (two HT logical CPUs) works with 3.2GHz clock but the secondary works with 2.8GHz.
What is also strange, this 3.2GHz freq is not listed on scaling_available_frequencies for both CPUs:
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver p4-clockmod
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies 350000 700000 1050000 1400000 1750000 2100000 2450000 2800000
# cat /sys/devices/system/cpu/cpu2/cpufreq/scaling_driver p4-clockmod # cat /sys/devices/system/cpu/cpu2/cpufreq/scaling_available_frequencies 350000 700000 1050000 1400000 1750000 2100000 2450000 2800000
I can confirm that this problem exists on 2.6.16/2.6.17/2.6.18 (just tested). Is it a problem with BIOS or p4-clockmod cpufreq driver?
Best regards,
Krzysztof Olędzki | |