Messages in this thread | | | Date | Fri, 18 Oct 2013 00:20:12 +0200 | From | Borislav Petkov <> | Subject | Re: AMD Bobcat cpufreq |
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On Thu, Oct 17, 2013 at 11:54:28PM +0300, Joonas Saarinen wrote: > All right. I'm finally back to re-investigate the issue. The > requested data can be found at: > > http://users.metropolia.fi/~joonasms/bobcat/ > > The CPU underclocks as expected but the turbo multiplier is never > activated.
Right, first of all, when you reply to people on lkml, please make sure to use "reply-to-all" in your mail client so that the people who you reply to can get your message directly instead of possibly missing it in the lkml flood.
Now, I'd guess this 1.3 GHz power state you're talking about is the boosted state. Here's how you dump that: build and install the cpupower tool in the kernel repository's tools/power/cpupower/ directory.
Then, do as root:
$ modprobe msr
because you need this module.
Once you've done that successfully, you need to run as root:
$ cd tools/power/cpupower/ $ LD_LIBRARY_PATH=. ./cpupower frequency-info
[ Btw, the cpupower tool might already be available in your distro... ]
Anyways, once you run it successfully, you'll get a similar dump as below which will show you all your power states. Pb0 should be 1333 in your case and if it says "boost state support: ... Active" then all is fine and your machine is switching into it but in a burstly manner - it cannot be running in it all the time because it would explode the TDP limits of the box.
HTH.
analyzing CPU 0: driver: acpi-cpufreq CPUs which run at the same hardware frequency: 0 CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: 4.0 us. hardware limits: 1.40 GHz - 4.00 GHz available frequency steps: 4.00 GHz, 3.40 GHz, 2.80 GHz, 2.10 GHz, 1.40 GHz available cpufreq governors: powersave, userspace, conservative, ondemand, performance current policy: frequency should be within 1.40 GHz and 4.00 GHz. The governor "ondemand" may decide which speed to use within this range. current CPU frequency is 2.80 GHz (asserted by call to hardware). cpufreq stats: 4.00 GHz:4.85%, 3.40 GHz:0.51%, 2.80 GHz:1.01%, 2.10 GHz:2.01%, 1.40 GHz:91.62% (1281567) boost state support: Supported: yes Active: yes Boost States: 2 Total States: 7 Pstate-Pb0: 4200MHz (boost state) Pstate-Pb1: 4100MHz (boost state) Pstate-P0: 4000MHz Pstate-P1: 3400MHz Pstate-P2: 2800MHz Pstate-P3: 2100MHz Pstate-P4: 1400MHz
-- Regards/Gruss, Boris.
Sent from a fat crate under my desk. Formatting is fine. --
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