Here is the impact:
Ryzen 5 2500U
Idle PkgWatt: 1.3W -> 0.75W
glxgears fps: 7200 -> 4500
aquarium 15,000 fish: 56-60 -> 45-50
These results are for gfx_off_ctrl_immediate()
https://github.com/pacoandres/laikm/issues/56
https://github.com/pacoandres/laikm/issues/47
Same results are for default zer
"Moreover the work only gets scheduled/cancelled
around a ref count of 0" - and this happens more than 600 times
per second under load, as you can see from the table.
Moreover these 600 GFXOFF requests are executed with a very
little interval between them. If we set GFXOFF delay to 0 by
default, i
Since there are several GPU series that require additional GFXOFF
ON/OFF switches
to ensure stability, this algorithm can be seen as a way to mitigate
the negative effects
of workarounds.
Simple and efficient.
Regards,
Sergey
On Mon, Mar 24, 2025 at 4:34 PM Sergey Kovalenko
wrote:
>
> Hello Alex
Hello Alex!
"If there are a lot of requests to toggle gfxoff, the worker thread to
allow it again gets
cancelled and scheduled again, extending the time it's disallowed." -
That's true except one thing:
cancelling and scheduling also take CPU cycles, and the pause between
submissions can exceed
10
On Mon, Mar 24, 2025 at 11:14 AM Sergey Kovalenko
wrote:
>
> "Moreover the work only gets scheduled/cancelled
> around a ref count of 0" - and this happens more than 600 times
> per second under load, as you can see from the table.
> Moreover these 600 GFXOFF requests are executed with a very
> l
On Mon, Mar 24, 2025 at 10:34 AM Sergey Kovalenko
wrote:
>
> Hello Alex!
>
> "If there are a lot of requests to toggle gfxoff, the worker thread to
> allow it again gets
> cancelled and scheduled again, extending the time it's disallowed." -
> That's true except one thing:
> cancelling and schedul
On Mon, Mar 24, 2025 at 5:06 AM Sergey Kovalenko
wrote:
>
> Predict an optimal delay to enable GFXOFF for the next interval
> based on the request count:
> - less than 15 requests per second - zero delay
> - less than 25 requests per second - default delay
> - 25 and more requests per second - don
