On Thu, Aug 26, 2004 at 07:54:21AM +0200, wilsonb wrote: > 1) Which versions of TCP does the FreeBSD 4.9 distribution support and > implement -- we need to use TCP Reno, NewReno, Tahoe, SACK and T/TCP in our > experiments.
SACK is not available in 4.9 -- although it is available in recent 5.x. I've seen mention of a possible MFC of code to support SACK, but as far as I'm aware, that hasn't happened yet. In any case, once MFC'd, you'ld have to upgrade to 4.10-STABLE to get it. Actually, for the purposes of experimentation you'ld probably be better off running a recent 5.3-CURRENT or 6.0-CURRENT, although take note of the warnings about WITNESS and INVARIANTS in /usr/src/UPDATING, and how they affect performance. I think all of the other features are available -- typically you'ld use net.inet.tcp sysctls to turn them on or off: see the tcp(4), ttcp(4) man pages for details. Another good approach is just to grep(1) through the kernel source code for interesting strings, and read the comments, if not the code itself. Cheers, Matthew -- Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks Savill Way PGP: http://www.infracaninophile.co.uk/pgpkey Marlow Tel: +44 1628 476614 Bucks., SL7 1TH UK
Description: PGP signature