On Mon, 13 Mar 2006 18:20:26 -0600, Saurabh Jain wrote:
Hi All, I am trying to write a new rate based transport protocol in
linux kernel (either as a module or directly within the kernel).
Basically it would be similar to UDP but with features like dynamic
rate control, connection and state management, error control like
TCP. Is there any established framework which i can use? I know
there is one for window based protocols like TCP where one can
dynamically register different congestion control mechanisms. I
would appreciate if somebody can give me some direction in this regard.
I do not know what you have in mind, but a general facility to transmit
a series of packets at spaced intervals would be very useful to
compensate for ack compression, etc. Preferably a facility simple
enough to be trivially offloaded to hardware. TSO/LSO hardware could
certainly use something similar for spacing segments, so breaking sends
over a size (c.f. sysctl_tcp_tso_win_divisor) manually would not be
necessary.
In software one might implement this as an alternative queueing
discipline at layer two. The minimum spacing interval could be obtained
from a route attribute similar to RTAX_ADVMSS. Alternatively, a
transport protocol might calculate the nominal transmission spacing as
the RTT divided by the congestion window size in packets and run or
share a similar transmission scheduler at layer 4.
- Mark B.
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