> I have also done some testing with CCID-3 (Linux 2.6.35 kernel.org tree)
> and the same symptoms are present there, but much, much less often.
> Maybe once every for every 2 hours the dccp connection is transferring
> data, as apposed to once for every 2 minutes in CCID-2.
>
Looking back at your other post, it is likely that you will see the
same behaviour also with CCID-3 in the test tree.
If I understand your setting of Delay Tolerant Networking correctly, then
this is a connection which has long idle phases.
The old TFRC specification (RFC 3448) penalized such connections (see
RFC 5348, 9.1), the new specification has support for data-limited
intervals (RFC 5348, 4.3), but the code is still at the in-between state
of rfc3448bis which preceded RFC 5348.
Hence it is a good time to add this missing support.
In the meantime, for testing CCID-248 might be of interest
CONFIG_IP_DCCP_CCID0=y
and then, after modprobe -v dccp,
echo 248 > /proc/sys/net/dccp/default/tx_ccid
echo 248 > /proc/sys/net/dccp/default/rx_ccid
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