On Wed, 22 Aug 2001, singh wrote:
> I even observed that FreeBSD4.3 adopts to NewReno algorith which is a
> suggestion in RFC-2582 (which talks about NewReno, SACK and FACK), for clients
> who can not have SACK/FACK, new reno will alleviate the problem of duplicate
> acks in Fast Recovery stage and partial ack is a better solution as comapre to
> reno algorithm.
Ok, I looked over the patch more, as well as the RFCs. Basic SACK support
seems straightforward according to the RFCs, but FACK is a bit more
complex. From what I can tell, FACK isn't a tcp feature as much as a
retransmission scheme. This scheme, in turn, has been updated and is now
called "rate halving".
Is the FACK implementation in this patch the old version, or the
rate-halving version? Also, does FACK spill over into non-SACKed
connections? I couldn't tell from a quick readthrough.
I've also noticed that while SACK is sysctl disableable, FACK is not. A
sysctl for FACK should be added as well so that we can enable/disable it
at will (as can be done with newreno.)
Thanks,
Mike "Silby" Silbersack
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