http://bugzilla.kernel.org/show_bug.cgi?id=15064
Rodrigo González del Cueto <rdelcu...@hotmail.com> changed:
What |Removed |Added
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CC| |rdelcu...@hotmail.com
--- Comment #2 from Rodrigo González del Cueto <rdelcu...@hotmail.com>
2010-01-18 02:52:36 ---
I also suffer from this issue when using the current and older Linux kernels
(<= 2.6.31) on my laptop. I'm aware that the Turbo Boost feature in Intel's
CORE architecture, is hardware controlled, and will only kick in when other
cores remain idle. I've read that older CORE cpu's correctly handle Turbo Boost
under Linux. I think this is an issue with newer models.
I've witness that all CPUs' multipliers remain capped @ 13x at all time. Using
the i7z program I've noticed that the cores will never reach C-states beyond
C1. Now, when I turn off ACPI support from the boot options @ grub, two of my
cores are not accessible, hence idle, and the remaining cores will have their
multiplier boosted up to 18x. This proofs that Turbo boost indeed works for
this CPU's under a Linux environment, but the current ACPI modules are not able
to use higher C-states, which might be the reason why the CPU multipliers won't
automatically step up.
SYSTEM INFORMATION
Running Ubuntu Linux, the Ubuntu 9.10 (karmic) release.
GNOME: 2.28.1 (Ubuntu 2009-11-03)
Kernel version: 2.6.31-18-server (#55-Ubuntu SMP Fri Jan 8 15:51:55 UTC
2010)
CPU INFORMATION
GenuineIntel, Intel(R) Core(TM) i7 CPU Q 720 @ 1.60GHz
Number of CPUs: 8
CPU clock currently at 933.000 MHz with 6144 KB cache
Numbering: family(6) model(30) stepping(5)
Bogomips: 3199.58
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 syscall nx rdtscp lm
constant_tsc arch_perfmon pebs bts rep_good xtopology tsc_reliable nonstop_tsc
pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2
popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
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