Stephen Hemminger wrote:
Rolled my sleeve's up and gave this a try...
This is a implementation of Sally Floyd's Limited Slow Start
for Large Congestion Windows.
Limited slow start is useful as a work-around for bottleneck queues that
are inappropriately short. I don't think it's good to run it all the
time by default (with a max_ssthresh < infinity), because it slows down
flows on healthy paths, and introduces another non-scalable parameter to
TCP.
I see it as potentially useful as a per-route parameter, where you set
it deliberately to work around some known problematic path. A sysctl
with a default value of infinity might be okay as well.
Practically speaking, we've had this in the Web100 patch for a long time
(and still do, look for WAD_MaxSsthresh), but I've never found it all
that useful. If the bottleneck queue is too short, you usually end up
getting screwed other ways too.
-John
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