Coda File System

Re: RPC2 and TCP on wireless networks

From: Jan Harkes <>
Date: Tue, 14 Sep 2004 11:49:45 -0400
On Mon, Sep 13, 2004 at 01:23:59PM -0400, Greg Troxel wrote:
> You could do that, but RPC2's congestion control algorithms are pretty
> archaic.  It would be really cool to make rpc2's transport run over
> SCTP instead, so one gets separate non-interfereing transactions, but
> also modern congestion control.

Actually, SCTP is 99% done. The only thing missing at the moment is
multi-rpc, but that shouldn't be too hard to add.

The problem is that the SCTP code is (clearly) not backward compatible
with the existing UDP transport and SCTP is not yet passed along by many
firewalls and routers, SCTP can't get outside of CMU's wireless
network, and possibly not even anywhere off-campus. The visiting student
(Gabriel Kaelin) who wrote it did a great job of cleaning up the code,
but along with fixing up the last few missing bits it would still
require a forward port of the existing UDP-based RPC2/SFTP transport.

Received on 2004-09-14 11:52:16