Can iperf3 run -M paramerts in windows OS?

[gg040431204]

Hi everyone:
I have a question want to ask. Can iperf3 windows ver tool run -M parameter? I check this in my side and find that it does not have any effect. Device driver always the same MSS value. Can anyone help it?

[davidBar-On]

Hi, usually iperf3 on Windows is built over Cywin (Windows iperf3 is not formally supported). iperf3 -M options sets TCP TCP_MAXSEG value. Per this Cygwin issue note it seems that TCP_MAXSEG is not supported by Cygwin. The relevant code (note that I don't know whether this is the formal Cygwin repository):

1690         case TCP_MAXSEG:
1691           /* Winsock doesn't support setting TCP_MAXSEG, only requesting it
1692              via getsockopt.  Make this a no-op. */
1693           ignore = true;
1694           break;