Missing HW and SW timestamps

[SPYFF]

Hi! Just a generic question, not necessarily to the isochron. When I run the software with smaller and smaller cycle times, like two or one digit usec, more and more missing timestamps reported. Is there something I can tune or this is an expected behavior? Is it possible to increase the buffersize of the MSG_ERRQUEUE or thats irrelevant for this problem? I use Intel i225 (igc driver) by the way.

The isochron report shows strange zero timestamps for those seqids:

5477 1657634261.805760775 1657634261.850920957 1657634261.850922060 0.000000000 1657634261.850929143 1657634261.850969224
5478 1657634261.805760780 1657634261.850926407 1657634261.850927447 0.000000000 1657634261.850934596 1657634261.850969270
5479 1657634261.805760785 1657634261.850931946 1657634261.850932950 1657634261.850940063 1657634261.850940100 1657634261.850969319
5480 1657634261.805760790 1657634261.850937442 1657634261.850939053 0.000000000 1657634261.850946321 1657634261.850969364
5481 1657634261.805760795 1657634261.850943630 1657634261.850945347 1657634261.850952424 1657634261.850952465 1657634261.850969409
5482 1657634261.805760800 1657634261.850949799 1657634261.850952194 0.000000000 1657634261.850959300 1657634261.850969456

For larger cycle times, I get all of the timestamps (rx: sw, hw, tx: sw, hw)