On Sat, 08 November 2014 Bruno Prémont wrote: > Since I have my Cubietruck, be it with 3.4 kernels or with mainline > kernels I've been experiencing unstable TCP connections. > > The symptoms are stalling connections (usually SSH connections to the > Cubietruck) that have nearly no chance at recovering. > > When I tell GMAC to only advertise up to 100Mbps speed the SSH > sessions do no show above symptoms anymore.
A thread seen on LKML and ARM/NetDev that might also point to the cause of this trouble: stmmac: potential circular locking dependency http://www.spinics.net/lists/arm-kernel/msg374256.html Bruno > If it's important, my setup is: > > 100Mbps 1Gbps > Laptop ----------- Switch --------- Cubietruck > > > > Any idea what the cause might be and how to fix it? > > > When running wireshark on the laptop there is only silence when the > SSH session is stalled. Just prior to stalling Wireshark mentions > one missed packet (previous segment not captured) and no more packets > after this. > > I've not yet had the opportunity to perform a tcpdump capture on the > Cubietruck side (not installed yet).
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