I'm experiencing hangs in TCP connections on a cubietruck running the
3.4.75 kernel (IOW the "Fedora 20" kernel).
Something like "ssh machine du /home" (with a large enough /home,
e.g. containing the Linux source) rarely finishes without freezing.
The freeze is only for a single TCP connection: when one TCP connection
freezes, the other ones keep working (until it's their time to freeze,
of course). I see those freezes with all connections I've tried
(i.e. SSH and IMAP-over-SSL connections).
And I just figured out that I can avoid this problem with:
ethtool -s eth0 speed 100 duplex full
IOW the problem only appears at 1Gbit/s.
Stefan
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