topic in Software Archive

mic frequency

kvs — Mon, 06 Jan 2014 19:08:59 GMT

Hi,

I am trying to get the phi to run at its fastest clock,

after looking at the following , it seems the phi is not running at its fastest clock.

~ # cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq

1238094

~ # cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
1333332

~ # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
619047 666666 714285 761904 857142 952380 1047618 1142856 1238094 1333332

Can anybody how I can get this to running at the highest available clock.

best regards

kvs

Here is some more information

kvs — Mon, 06 Jan 2014 19:36:00 GMT

Here is some more information

~ # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
1238094

~ # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
619047

~ # echo 1333332 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

~ # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
1238094

~ # cat /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state

619047 0
666666 0
714285 0
761904 0
857142 0
952380 0
1047618 0
1142856 0
1238094 181873382
1333332 0

TimP — Mon, 06 Jan 2014 19:55:00 GMT

Did you check the turbo boost setting in micsmc-gui?

Hi Tim,

kvs — Mon, 06 Jan 2014 20:06:44 GMT

Hi Tim,

I just tried to set the turbo mode but got the message

"Turbo Mode not supported on one or more devices"

regards

kvs

TimP — Tue, 07 Jan 2014 01:00:00 GMT

That likely means your model isn't capable of the higher frequency. Turbo is pricey, and boosts power consumption much more than performance.

Hi Tim,

kvs — Tue, 07 Jan 2014 01:16:09 GMT

Hi Tim,

It is a 7120P and is supposed to support turbo mode. Is there any other way to turn turbo ON.

Please see the attached micinfo dump .

thanks

kvs

Turbo is only available on

TaylorIoTKidd — Tue, 07 Jan 2014 01:18:02 GMT

Turbo is only available on the highest end SKUs (pricey and actively cooled). If you didn't intentionally look for the highest performing coprocessor, you don't have turbo capability.

Have you used the micsmc tool to check and modify your power management functions? (See attachment) P-states are normally enabled. If you having disabled them, it might cause your frequency to drop.

(To use micsmc to modify the coprocessor PM settings, you need to be root.)

Regards
--
Taylor

missed attachment

kvs — Tue, 07 Jan 2014 01:18:35 GMT

missed attachment

Hi Tylor,

kvs — Tue, 07 Jan 2014 01:46:00 GMT

Hi Taylor,

Looks like that was the issue, the p-states were disabled. Now turbo can be turned on.

Your screen shot was very helpful.

Thanks a lot to you and Tim for the valuable inputs.

regards

kvs

One more note: In the micinfo

TaylorIoTKidd — Wed, 08 Jan 2014 00:25:24 GMT

One more note: In the micinfo dump you gave us, it says

        SMC HW Revision          : Product 300W Passive CS

I'm pretty sure this means that your coprocessor is passively cooled. It may not have all the features (e.g. turbo) available.

--
Taylor

Here's where you can get some

TaylorIoTKidd — Wed, 08 Jan 2014 18:58:31 GMT

Here's where you can get some marketing product specifications:

https://www-ssl.intel.com/content/www/us/en/processors/xeon/xeon-phi-detail.html

http://ark.intel.com/products/series/75809

If you click on the product name, you can see the specifications, including if it has turbo boast technology.

Regards
--
Taylor