Hi!
I've added a small test utility for the TTM buffer object functionality
in drm/tests/ttmtest.
It benchmarks various simple buffer operations like binding, writing,
reading in some
various memory types / regions: system, GTT and cache coherent GTT.
It's not really complete and one could for example add options for
buffer size etc.
Typical output for a 4MB buffer is attached. Experimenting with the
buffer size will show bottlenecks,
for example the binding / unbinding latency when binding to uncached GTT.
It's also an example of how a small general-purpose DRI client (XvMC
etc.) can be made.
In the end, the DRI client protocol code should probably end up in a
separate lib.
/Thomas
Buffer size 4194304 bytes
System memory timings ********************************
Creation took 136169 ticks
Mapping took 119251 ticks
Writing took 29674128 ticks
Writing Again took 11932327 ticks
Reading took 5397502 ticks
Unmapping took 78364 ticks
TT Memory timings ************************************
Moving to TT took 3122768 ticks
Mapping in TT took 28556 ticks
Writing to TT took 6250244 ticks
Writing again to TT took 4879347 ticks
Reading from TT took 591188466 ticks
Moving to system took 2149862 ticks
Cached TT Memory timings *****************************
Moving to CTT took 298265 ticks
Mapping in CTT took 16896 ticks
Writing to CTT took 14765135 ticks
Re-writing to CTT took 12086448 ticks
Reading from CTT took 5202604 ticks
Terminating normally
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