Can anyone shed any light on the output of intel_gpu_top
? Specifically, what is task GAM, VS etc (The man page isn't much help.)
What does bitstream busy mean? It always seems to be zero...
render busy: 45%: █████████ render space: 83/131072
bitstream busy: 0%: bitstream space: 0/131072
blitter busy: 0%: blitter space: 0/131072
task percent busy
GAM: 43%: ████████▋ vert fetch: 0 (0/sec)
VS: 35%: ███████ prim fetch: 0 (0/sec)
CL: 33%: ██████▋ VS invocations: 2101845324 (1427552/sec)
SF: 33%: ██████▋ GS invocations: 0 (0/sec)
VF: 33%: ██████▋ GS prims: 0 (0/sec)
GAFS: 33%: ██████▋ CL invocations: 701123988 (475776/sec)
SOL: 32%: ██████▌ CL prims: 701708489 (475888/sec)
GS: 32%: ██████▌ PS invocations: 1254669239424 (116548992/sec)
DS: 32%: ██████▌ PS depth pass: 604287310764 (222384008/sec)
TDG: 2%: ▌
URBM: 2%: ▌
GAFM: 1%: ▎
HS: 0%:
SVG: 0%:
VFE: 0%:
I was curious as well, so here are just a few things I could grab from the reference manuals. Also of interest is the intel-gpu-tools source, and especially lib/instdone.c
which describes what can appear in all Intel GPU models. This patch was also hugely helpful in translating all those acronyms!
Some may be wrong, I'd love it if somebody more knowledgeable could chime in! I'll come back to update the answer with more as I learn this stuff.
First, the three lines on the right :
Fixed function (FF) pipeline units (old-school GPU features) :
Units used for thread and pipeline management, for both FF units and GPGPU (see Intel Open Source HD Graphics Programmers Manual for a lot of info on how this all works) :
Other stuff :
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