Limit gpu max clock for ryzen 2400g

[Lauri Ehrenpreis]

Hi!

Thanx for helping, but I have tried those methods and they didn't work on
Ryzen 2400G.

--
Lauri

On Tue, Mar 26, 2019 at 2:57 PM Russell, Kent <Kent.Russell at amd.com> wrote:

> Hi Lauri,
>
>
>
> There’s a more efficient method using the Power Profiles (and optionally,
> the ROCM-SMI tool, found at https://github.com/RadeonOpenCompute/ROC-smi),
> or the pp_sclk mask, depending on what exactly you want. I’ll list out the
> methods here and the rocm-smi and non-SMI commands to do it. I’ll assume
> that this GPU is card0 (it may be card1, card2, etc, depending on what GPUs
> are installed on your system; “rocm-smi -i” or “cat
> /sys/class/drm/card?/device/device will give you the GPU IDs of all of the
> cards, then you can figure out which one you want to use)
>
>
>
>    1. Mask the SCLKs . pp_dpm_sclk allows you to set a mask of what
>    levels to use.
>       1. First, read the values (“rocm-smi --showclkfrq” , or “cat
>       /sys/class/drm/card0/device/pp_dpm_sclk”) and see the supported DPM levels
>       for your card.
>       2. Mask off the levels that you don’t want. E.g. If you only want
>       to use levels 0-6 (and thus skip level 7), you can do either ‘rocm-smi
>       --setsclk 0 1 2 3 4 5 6’ or ‘echo manual >
>       /sys/class/drm/card0/device/power_dpm_force_performance_level && echo “0 1
>       2 3 4 5 6” > /sys/class/drm/card0/device/pp_dpm_sclk’ . This will set DPM
>       to only use levels 0-6 and skip level 7. You can do this for any
>       combination of levels or a single level (“0 2 5”, “1 2 7”, “5”, etc). That
>       will tell it to only use the specified DPM levels and will persist until
>       reboot, or until the power_dpm_force_performance is set back to ‘auto’ .
>    2. Set the specific DPM level values manually:
>       1. First, you’ll need to enable the Power Profile Overdrive
>       functionality. The easiest way is to add “amdgpu.ppfeaturemask=0xffffffff”
>       to your linux command line parameters (by editing /boot/grub/grub.cfg
>       manually, editing /etc/default/grub and doing an update-grub, or manually
>       entering the kernel parameter in the GRUB menu before booting).
>       2. Once that’s enabled, you should see the following file:
>       /sys/class/drm/card0/device/pp_od_clk_voltage.
>       3. Check the current DPM level information with “rocm-smi -S” or
>       “cat /sys/class/drm/card0/device/pp_od_clk_voltage file” . Now that we have
>       that, you can see the supported SCLK and voltages for each level.
>       4. You can use the rocm-smi tool to manually change the levels
>       through “rocm-smi --setslevel # MHZ VLT”, where:
>
>                                                                i.       #
> is the level (level 7 is probably the one you want, but you can do it for
> all of them)
>
>                                                              ii.      MHZ
> is the speed in MHz
>
>                                                            iii.      VLT
> is the voltage in mV.
>
>    1. Honestly, you can probably just copy the highest level that you’re
>       comfortable with and set that for all of the levels that exceed the values
>       that you desire. So if you want to keep it to whatever level 6 is, just set
>       level 7 to have the same values as level 6 (that way you don’t have to muck
>       with voltages and such). Or if 5 is the highest that you want, set level 6
>       and level 7 to match level 5
>
>
>
> Hopefully that helps. It also means that you don’t have to constantly try
> to build your own kernel with a change to cap the SCLK cherry-picked on
> tpo. Please let me know if you have any questions at all!
>
>
>
> Kent
>
>
>
> *From:* amd-gfx <amd-gfx-bounces at lists.freedesktop.org> *On Behalf Of *Lauri
> Ehrenpreis
> *Sent:* Friday, March 22, 2019 6:18 AM
> *To:* amd-gfx list <amd-gfx at lists.freedesktop.org>
> *Subject:* Limit gpu max clock for ryzen 2400g
>
>
>
> Hi!
>
>
>
> Is there a way how to limit gpu max clock rate? Currently I can either
> leave the clock to automatic mode or force it to specific level
> via /sys/class/drm/card0/device/pp_dpm_sclk. But ideally I would like the
> clock to be automatically regulated but specify a different upper limit for
> power saving reasons.
>
>
>
> --
>
> Lauri
>
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