Hi Jon,

Jon Wikne wrote:

What happens is typically this: After transeferring some
data, ranging from less than 100kB to 10MB, the upload freezes,
i.e. gets no further. Use of ping shows the connection is
effectively dead. If I do a sequence /sbin/ifdown eth0
/sbin/ifup eth0 the upload might resume, but stops again
shortly. The phenomenon seems to occur sooner if the path
to the remote system is _fast_ (low ping times).

You can try applying this patch:
http://developer.osdl.org/shemminger/prototypes/sky2-proc-debug.patch

It will add a /proc/net/sky2/ethX file, which lists the status of the TX 
and status rings. You should compare the contents of this file during 
normal operation to when the interface has hung.

Daniel