Does gpuinfo.sh always print Idle 0%?

[Takashi_Kashiwagi]

Hi everyone.

I have using IMX8MQ-EVK with imxlinux-4.14 sumo.

I'd like to check GPU Idle percentage, so I used gpuinof.sh.

But the result is always idle 0%, I do not think the result is correct.

Is the execution method of gpuinfo.sh wrong?

Or is there another way to know the idle percentage of the GPU?

The result of gpuinfo.sh is as follows.

root@imx8mqevk:~# /unit_tests/GPU/gpuinfo.sh

---- Running < gpuinfo.sh > test ----
GPU Info
gpu : 0
model : 7000
revision : 6214
product : 70002
eco : 0

VIDEO MEMORY:
gcvPOOL_SYSTEM:
Free : 207724024 B
Used : 60711432 B
MinFree : 199387496 B
MaxUsed : 69047960 B
Total : 268435456 B
gcvPOOL_CONTIGUOUS:
Used : 0 B
gcvPOOL_VIRTUAL:
Used : 0 B

NON PAGED MEMORY:
Used : 0 B
CMA memory info
type n pages bytes
cma 65720 269189120
VidMem Usage (Process 3828: weston):
Current Maximum Total
All-Types 34623000 34624280 34635928
Index 0 0 0
Vertex 1048576 1048576 1048576
Texture 16384 16384 16384
RenderTarget 33423360 33423360 33423360
Depth 0 0 0
Bitmap 0 0 0
TileStatus 131072 131072 131072
Image 0 0 0
Mask 0 0 0
Scissor 0 0 0
HZ 0 0 0
ICache 272 272 272
TxDesc 3328 4608 15616
Fence 8 8 8
TFBHeader 0 0 0

All-Pools 34623000 34624280 34635928
Default 0 0 0
Local 0 0 0
Internal 0 0 0
External 0 0 0
Unified 0 0 0
System 34623000 34624280 34635928
Virtual 0 0 0
User 0 0 0
Contiguous 0 0 0

AllocNonPaged 0 0 0
AllocContiguous 0 0 0
MapUserMemory 0 0 0
MapMemory 268435456 268435456 268435456

VidMem Usage (Process 3863: weston-keyboard):
Current Maximum Total
All-Types 4075592 4075592 4098152
Index 0 0 0
Vertex 1048576 1048576 1048576
Texture 1050624 1067008 1067008
RenderTarget 1572864 1572864 1572864
Depth 393216 393216 393216
Bitmap 0 0 0
TileStatus 8960 8960 8992
Image 0 0 0
Mask 0 0 0
Scissor 0 0 0
HZ 0 0 0
ICache 832 832 832
TxDesc 512 768 768
Fence 8 8 8
TFBHeader 0 0 0

All-Pools 4075592 4075592 4098152
Default 0 0 0
Local 0 0 0
Internal 0 0 0
External 0 0 0
Unified 0 0 0
System 4075592 4075592 4098152
Virtual 0 0 0
User 0 0 0
Contiguous 0 0 0

AllocNonPaged 0 0 0
AllocContiguous 0 0 0
MapUserMemory 0 0 0
MapMemory 268435456 268435456 268435456

VidMem Usage (Process 3864: weston-desktop-):
Current Maximum Total
All-Types 22012840 29225080 42849416
Index 0 0 0
Vertex 1048576 1048576 1048576
Texture 0 8355840 8355840
RenderTarget 16711680 16711680 16711680
Depth 4177920 4177920 8355840
Bitmap 0 0 0
TileStatus 73696 73696 81856
Image 0 0 0
Mask 0 0 0
Scissor 0 0 0
HZ 0 0 0
ICache 640 640 640
TxDesc 256 512 512
Fence 72 72 72
TFBHeader 0 0 0

All-Pools 22012840 29225080 42849416
Default 0 0 0
Local 0 0 0
Internal 0 0 0
External 0 0 0
Unified 0 0 0
System 22012840 29225080 42849416
Virtual 0 0 0
User 0 0 0
Contiguous 0 0 0

AllocNonPaged 0 0 0
AllocContiguous 0 0 0
MapUserMemory 0 0 0
MapMemory 268435456 268435456 268435456

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Idle percentage:0.000.000.000.000.000.00%
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

---- Test < gpuinfo.sh > ended ----

I read "i.MX_Graphics_User's_Guide.pdf", but the details were not written.

Best Regards,

T.Kashiwagi

[b36401 · Accepted solution]

Actually the GPU automatically goes in power off mode when nothing is to do. So it does not run idle.

By the way you can get more details of GPU state with "cat /sys/kernel/debug/gc/idle" command.

Have a great day,
Victor

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[Takashi_Kashiwagi]

Hi Victor

Thank you for responding.

> Actually the GPU automatically goes in power off mode when nothing is to do. So it does not run idle.

> By the way you can get more details of GPU state with "cat /sys/kernel/debug/gc/idle" command.

Understood. I executed it and the result is as follows.

root@imx8mqevk:~# cat /sys/kernel/debug/gc/idle
Start: 5757240251 ns
End: 7524459253552 ns
On: 2938778259485 ns
Off: 138181322440 ns
Idle: 0 ns
Suspend: 4441742431376 ns

Based on the above results, the GPU "On" time is 39% (2938778259485 / 7518702013301 = 0.39).

This is only 39% of On time, but it does not mean that you are using 39% of the Total GPU performance, right?

Best Regrads,

T.Kashiwagi