Comme=
nt # 11
on bug 10751=
8
from Luigi Laurini
Same bug present in amd64 architecture under kvm guest with RX=
480 passed
through.
The first time i boot the guest the performance are ok, but if i reboot the
guest without rebooting the host, the messages appears.
Tried the patch=20
https://cgit.=
freedesktop.org/~agd5f/linux/commit/?h=3Damd-staging-drm-next&id=3D8242=
308cc3c4419832126ab78ca409ce7110ab33
The message are gone but the performance problem is still present.
the problem affects the memory/gpu clocking:
First boot of the guest:
cat /sys/kernel/debug/dri/0/amdgpu_pm_info=20
Clock Gating Flags Mask: 0x37bcf
Graphics Medium Grain Clock Gating: On
Graphics Medium Grain memory Light Sleep: On
Graphics Coarse Grain Clock Gating: On
Graphics Coarse Grain memory Light Sleep: On
Graphics Coarse Grain Tree Shader Clock Gating: Off
Graphics Coarse Grain Tree Shader Light Sleep: Off
Graphics Command Processor Light Sleep: On
Graphics Run List Controller Light Sleep: On
Graphics 3D Coarse Grain Clock Gating: Off
Graphics 3D Coarse Grain memory Light Sleep: Off
Memory Controller Light Sleep: On
Memory Controller Medium Grain Clock Gating: On
System Direct Memory Access Light Sleep: Off
System Direct Memory Access Medium Grain Clock Gating: On
Bus Interface Medium Grain Clock Gating: Off
Bus Interface Light Sleep: On
Unified Video Decoder Medium Grain Clock Gating: On
Video Compression Engine Medium Grain Clock Gating: On
Host Data Path Light Sleep: Off
Host Data Path Medium Grain Clock Gating: On
Digital Right Management Medium Grain Clock Gating: Off
Digital Right Management Light Sleep: Off
Rom Medium Grain Clock Gating: On
Data Fabric Medium Grain Clock Gating: Off
GFX Clocks and Power:
1750 MHz (MCLK)
330 MHz (SCLK)
300 MHz (PSTATE_SCLK)
300 MHz (PSTATE_MCLK)
1000 mV (VDDGFX)
19.127 W (average GPU)
GPU Temperature: 56 C
GPU Load: 0 %
UVD: Disabled
VCE: Disabled
if i reboot the guest:
cat /sys/kernel/debug/dri/0/amdgpu_pm_info
Clock Gating Flags Mask: 0x37bcf
Graphics Medium Grain Clock Gating: On
Graphics Medium Grain memory Light Sleep: On
Graphics Coarse Grain Clock Gating: On
Graphics Coarse Grain memory Light Sleep: On
Graphics Coarse Grain Tree Shader Clock Gating: Off
Graphics Coarse Grain Tree Shader Light Sleep: Off
Graphics Command Processor Light Sleep: On
Graphics Run List Controller Light Sleep: On
Graphics 3D Coarse Grain Clock Gating: Off
Graphics 3D Coarse Grain memory Light Sleep: Off
Memory Controller Light Sleep: On
Memory Controller Medium Grain Clock Gating: On
System Direct Memory Access Light Sleep: Off
System Direct Memory Access Medium Grain Clock Gating: On
Bus Interface Medium Grain Clock Gating: Off
Bus Interface Light Sleep: On
Unified Video Decoder Medium Grain Clock Gating: On
Video Compression Engine Medium Grain Clock Gating: On
Host Data Path Light Sleep: Off
Host Data Path Medium Grain Clock Gating: On
Digital Right Management Medium Grain Clock Gating: Off
Digital Right Management Light Sleep: Off
Rom Medium Grain Clock Gating: On
Data Fabric Medium Grain Clock Gating: Off
GFX Clocks and Power:
300 MHz (MCLK)
300 MHz (SCLK)
300 MHz (PSTATE_SCLK)
300 MHz (PSTATE_MCLK)
800 mV (VDDGFX)
7.162 W (average GPU)
GPU Temperature: 42 C
GPU Load: 0 %
UVD: Disabled
VCE: Disabled