* state[i].transition_latency and state[i].bus_master_latency set to 0. BUG?
@ 2014-08-05 15:37 Ricardo Ribalda Delgado
2014-09-12 8:55 ` Ricardo Ribalda Delgado
0 siblings, 1 reply; 2+ messages in thread
From: Ricardo Ribalda Delgado @ 2014-08-05 15:37 UTC (permalink / raw)
To: linux-acpi, linux-pm, alex@qtec.com
Hello!
I am working with an AMD family 14h Processor. And I believe that the
governor is not behaving as expected.
On the _PSS table, the transition_latency and bus_master_latency are set to 0.
The AMDs BIOS development guide (page 60 and 61)
http://developer.amd.com/wordpress/media/2012/10/43170_14h_Mod_00h-0Fh_BKDG.pdf
they recommend to use value of 0.
Is 0 valid value? The governor will work properly with this value?
What could be a good default value?
Is there a way to experimentally measure the latency?
Thanks for your help!
Extract from dmesg:
[ 0.843340] Extracting state 0
[ 0.843374] State [0]: core_frequency[1650] power[6075]
transition_latency[0] bus_master_latency[0] control[0x0] status[0x0]
[ 0.843481] Extracting state 1
[ 0.843513] State [1]: core_frequency[1320] power[3712]
transition_latency[0] bus_master_latency[0] control[0x1] status[0x1]
[ 0.843618] Extracting state 2
[ 0.843652] State [2]: core_frequency[825] power[1472]
transition_latency[0] bus_master_latency[0] control[0x2] status[0x2]
[ 0.843757] Extracting state 3
[ 0.843790] State [3]: core_frequency[528] power[1008]
transition_latency[0] bus_master_latency[0] control[0x3] status[0x3]
--
Ricardo Ribalda
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: state[i].transition_latency and state[i].bus_master_latency set to 0. BUG?
2014-08-05 15:37 state[i].transition_latency and state[i].bus_master_latency set to 0. BUG? Ricardo Ribalda Delgado
@ 2014-09-12 8:55 ` Ricardo Ribalda Delgado
0 siblings, 0 replies; 2+ messages in thread
From: Ricardo Ribalda Delgado @ 2014-09-12 8:55 UTC (permalink / raw)
To: linux-acpi, linux-pm, alex@qtec.com
Just in case somebody missed this mail in their holiday inbox :)....
Any good ideas for this?
On Tue, Aug 5, 2014 at 5:37 PM, Ricardo Ribalda Delgado
<ricardo.ribalda@gmail.com> wrote:
> Hello!
>
> I am working with an AMD family 14h Processor. And I believe that the
> governor is not behaving as expected.
>
> On the _PSS table, the transition_latency and bus_master_latency are set to 0.
>
> The AMDs BIOS development guide (page 60 and 61)
> http://developer.amd.com/wordpress/media/2012/10/43170_14h_Mod_00h-0Fh_BKDG.pdf
> they recommend to use value of 0.
>
> Is 0 valid value? The governor will work properly with this value?
>
> What could be a good default value?
>
> Is there a way to experimentally measure the latency?
>
> Thanks for your help!
>
> Extract from dmesg:
> [ 0.843340] Extracting state 0
> [ 0.843374] State [0]: core_frequency[1650] power[6075]
> transition_latency[0] bus_master_latency[0] control[0x0] status[0x0]
> [ 0.843481] Extracting state 1
> [ 0.843513] State [1]: core_frequency[1320] power[3712]
> transition_latency[0] bus_master_latency[0] control[0x1] status[0x1]
> [ 0.843618] Extracting state 2
> [ 0.843652] State [2]: core_frequency[825] power[1472]
> transition_latency[0] bus_master_latency[0] control[0x2] status[0x2]
> [ 0.843757] Extracting state 3
> [ 0.843790] State [3]: core_frequency[528] power[1008]
> transition_latency[0] bus_master_latency[0] control[0x3] status[0x3]
>
>
> --
> Ricardo Ribalda
--
Ricardo Ribalda
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2014-09-12 8:55 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-08-05 15:37 state[i].transition_latency and state[i].bus_master_latency set to 0. BUG? Ricardo Ribalda Delgado
2014-09-12 8:55 ` Ricardo Ribalda Delgado
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).