Re: [PATCH] Make CUBIC Hystart more robust to RTT variations

On Tue, 8 Mar 2011 10:32:15 +0100
Lucas Nussbaum [off-list ref] wrote:

CUBIC Hystart uses two heuristics to exit slow start earlier, before
losses start to occur. Unfortunately, it tends to exit slow start far too
early, causing poor performance since convergence to the optimal cwnd is
then very slow. This was reported in
http://permalink.gmane.org/gmane.linux.network/188169 and
https://partner-bugzilla.redhat.com/show_bug.cgi?id=616985

Ignore the RHEL bug. RHEL 5 ships with TCP BIC (not CUBIC) by default.
There are many research papers which show that BIC is too aggressive,
and not fair.

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