* [MPTCP] [BUG] mptcp data transfers very slow in mmap mode
@ 2020-05-11 12:08 Florian Westphal
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From: Florian Westphal @ 2020-05-11 12:08 UTC (permalink / raw)
To: mptcp
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$subject says it all:
ns1 TCP -> ns1 (127.0.0.1:10000 ) TCP (duration 349ms)
ns1 MPTCP -> ns1 (127.0.0.1:10001 ) MPTCP (duration 26780ms)
ns1 MPTCP -> ns1 (127.0.0.1:10002 ) TCP (duration 353ms)
ns1 TCP -> ns1 (127.0.0.1:10003 ) MPTCP (duration 343ms)
This is with '-m mmap', no tc, and a file of 50 mbyte.
Might be related to
https://github.com/multipath-tcp/mptcp_net-next/issues/6
(i.e., it could be that -m mmap just triggers this reliably).
I will investigate; I get the above result on both net-next
and mptcp-next with no changes.
Recent patches I sent do not change the 'lo' behaviour but
I do see worse behaviour of cross-netns transfers.
Don't know why so far, will report when I learn more.
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2020-05-11 12:08 [MPTCP] [BUG] mptcp data transfers very slow in mmap mode Florian Westphal
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