I think the main question left is:
what can we do if Ethernet flow control *cannot* be disabled in either
the server NIC or the switch?
(e.g. many Realtek or Atheros -based NICs and switches don't have flow
control configurable).


I think that the best solution would be to limit the rate of the data
that the server sends to the clients (X, NBD, SSHFS/NFS...) to e.g. 90
Mbps per client at the TCP level, probably using iptables and tc.

If someone has the knowledge to do that, we could then add a script in
LTSP to make it easier for sysadmins, e.g.
`ltsp-config flowcontrol off`


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