hooglperformance.blogg.se - What is turbo boost linus

#WHAT IS TURBO BOOST LINUS HOW TO#
#WHAT IS TURBO BOOST LINUS INSTALL#
#WHAT IS TURBO BOOST LINUS DRIVER#
#WHAT IS TURBO BOOST LINUS SERIES#

Remember, the decision for or against the boost is made by the APU autonomously. This was tested without X being used or even configured. Withe the ATI/AMD fglrx module loaded into the kernel, the processor will boost two cores permanently (and apparently also the remaining cores temporarily).

#WHAT IS TURBO BOOST LINUS DRIVER#

With the standard video driver or even the radeon module in the kernel, I did not succeed to get the A10-6700 to use a boost frequency (using stress -cpu 2).

The frequencies shown by these tools are supposed to reflect boosts.

The output of cpufreq-aperf (after modprobe msr) is comparable to the output of cpupower monitor.

The output of cpufreq-info will not show available boost frequencies, but the output of cpupower frequency-info will.

The boost is an autonomous decision on the chip based on potentially complex criteria.

The output of cat /proc/cpuinfo does not, and will not, reflect any processor boost.

I am in the process of configuring a system with an A10-6700 using Ubuntu 14.04 Server. Such as the ondemand governor potentially being worse than performance (at least with the Richland A10-6700) and fglrx apparently using some questionable tricks to improve short-term boosts, abruptly having to compensate for that in the long run. I published a detailed analysis over at which contains (at least for me) a few surprises.

#WHAT IS TURBO BOOST LINUS HOW TO#

If you run Debian, or if you run Ubuntu and the above is not true for you, please refer to How to set up a Debian system (focus on 2D or console/server) with an AMD Turbo Core APU for maximum energy and computing efficiency?

Which means that with Kernel 3.16 or later, Turbo Core should work right out of the box with radeon in many cases. The value of bapm is set to 1 by default for Kaveri, Kabini and desktop Trinity, Richland systems (see here), resulting in Turbo Core being enabled. The value for bapm can be provided as a module parameter (see here). Keep in mind that CPU power is also shared with GPU, so you'll almost never get the highest frequency available if GPU is also in use. You should get a kernel panic boost working now.

#WHAT IS TURBO BOOST LINUS INSTALL#

To enable it, open this file, find this line: pi->enable_bapm = false Ĭhange false to true, then compile and install new kernel. It's located in drivers/gpu/drm/radeon/trinity_dpm.c and it's (at the time of writing) enabled only for MSI boards, because of stability issues.

#WHAT IS TURBO BOOST LINUS SERIES#

turbostatĮDIT: It seems like Trinity series processors have it's own BAPM switch in source. More tests (ran with ondemand scheduler and 3 instances of ffmpeg decoding 1920x1080 H.264 video in background): turbostat]$ sudo cpupower monitorģ| 99,18| 0,82| 1808|| 0,00| 0,00| turbostat]$ sudo. Here is output of cpupower frequency-info, notice Active: no under boost state support: analyzing CPU 0:ĬPUs which run at the same hardware frequency: 0ĬPUs which need to have their frequency coordinated by software: 0Īvailable frequency steps: 1.90 GHz, 1.80 GHz, 1.70 GHz, 1.60 GHz, 1.40 GHzĪvailable cpufreq governors: conservative, ondemand, userspace, powersave, performanceĬurrent policy: frequency should be within 1.90 GHz and 1.90 GHz. Everything works on Windows, however, on Linux CPU frequency can't get past 1.9 GHz (checked with cpufreq-aperf). I'm using Ubuntu 14.04 (3.13.0-24-generic kernel) on AMD A8-4500m based laptop, and I've recently noticed, that AMD Turbo Core is not working at all.