James Healy wrote:
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I.e. where we keep past connection state and use that
as a reference for the initial cwnd. I asked Mark about
this in the past.. and he said that his paper was
mis-interpreted and this is incorrect behavior. If you
have no connections up to a peer you should not use any
past value for the cwnd...
So it's possible that the inital cwnd shouldn't be set by the hostcache
at all?
If this was the case, does that mean we'd just use the rfc 3390 logic if
enabled, with fallback to the manual sysctl variables as a last resort?
IMO if you want to follow the true spirit of RFC3390 and RFC2581 then
yes.. you should ONLY use RFC3390 (or 2581) to set your initial
cwnd.
I am adding Mark Allman on this to get his opinion.. Mark, here
is your big chance to chime in on something that has had your
name in comments in FreeBSD code for years...
Basically let me referesh your memory in case you are not on
[EMAIL PROTECTED] (or you can go look at the thread).
Currently FreeBSD will dig into its hostcache and set the
cwnd of a new connection to the previous value with some constraints..
James posted these a fe days ago when noting funny behavior.
I chimed in and said really IMO using the previous cwnd
of old connections is NOT a good idea.. (I can see using
the previous ssthresh.. but not cwnd).. and it is exactly
why our SCTP implementation DOES NOT do this..
What do you think Mark (since your name is in the comments
to justify this action)..
R
James
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