Miroslav,

There is no correction necessary. The speed change itself does not have any 
impact because the transmission time is symmetrical.

Given host A on a 1Gb link and host B on a 100Mb link:

  A -> Switch transmission time 754ns
  Switch -> B transmission time 7540ns
  Total time 8294ns

  B -> Switch transmission time 7540ns
  Switch -> transmission time 754ns
  Total time 8294ns

The propagation delay is symmetrical.

Unless there are a backlog of packets on one of the involved ports, the switch 
has zero impact on accuracy.

Denny



> On Nov 21, 2016, at 00:30, Miroslav Lichvar <mlich...@redhat.com> wrote:
> 
> In your case you will still need to have some correction for the extra
> delay due the switch in the 100mbit->1gbit direction and I suspect
> switches in general will be the biggest trouble when trying to get the
> best accuracy.

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