On Mon, Jan 14, 2019 at 11:17 PM Dejene Boru <dejene.boru(a)gmail.com> wrote:
While running an experiment in Mininet using MPTCP, MPTCP falls back to TCP after three
SYN retransmissions. I have enabled MPTCP both on the host node and Mininet emulated
hosts. The problem appears when multiple clients attempt to connect to the server, i.e., I
have a client-server application, the servers listen on a given port and the clients
connect to the servers at a certain time interval to download some file size (100KB,
30MB). A connection with a client closes after the desired file size transfer but the
server continues to listen for new connections. The problem happens after some number of
clients are connected and irrespective of path managers and the number of sub flows used.
I have tried to enable MPTCP to debug flag and the following debug message is printed.
'mptcp_do_join_short:mpcb not found'
Host evnironment: Ubuntu 16.04, Linux version 4.14.79, MPTCP (v0.94)
It seems that you are using this version of the kernel:
Not the one for upstream and linked to this ML:
Could you then report your problem to this ML instead please?
Also it can be interesting to clearly state what's your problem:
what's you expect and what's you saw instead? I guess it is because
some connections fallback to TCP after 3 SYN retransmissions while it
should not happen in your test env but it is not clear, at least for
Neither CPU nor memory seems to be part of the problem since during the test the CPU
usage is less than 10% and memory usage is also negligible.
I would appreciate a suggestion for a workaround for this issue.\
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Matthieu Baerts | R&D Engineer
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