I was trying to perform some latency and bandwidth related experiments on kit as the previous board ( CARMA ) had some limitations related to same ( Latency : 100 microsecond , Bandwidth: max achievable: 450 mbytes )
Our experiment shows that bandwidth improved significantly ( that is obvious as PCI limitation is gone )
But latency came out as surprise for us. Latency for launching async calls ( Kernel launch , memcpyasyn) is in range of ( 400 microsec ).
Latency experiment setup:
– Host to device transfer and vice versa of pinned memory of size 4 bytes
– Simple kernel launch
The numbers are taken from command profiler which shows cputime given above.
Why is the latency so high in Jetson Kit. Is there any confirugarion I have missed or it is a known issue?