On Thu, May 21, 2020 at 09:26:59AM -0400, cpham2...@comcast.net wrote:

> My master clock and PTP clients on are a local network with no
> PTP-support switches. There are 4 switches along the path between
> the master clock and the clients. When I ran linuxptp in hardware
> timestamp mode in the same network setting, I achieved great
> results: 90% of master offsets is within 1 micro-sec. In software
> timestamp mode the master offsets are higher than expected.  Is
> there anything I can do to improve the accuracy?

I am afraid that your results are in fact typical.  There is a long
and non-deterministic path from the frames on the wire to the software
time stamp somewhere in the networking stack.


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