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 <[email protected]> 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 <[email protected]> *On Behalf Of *Lauri > Ehrenpreis > *Sent:* Friday, March 22, 2019 6:18 AM > *To:* amd-gfx list <[email protected]> > *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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