From: draft-ietf-tcpm-initcwnd-08.txt http://www.ietf.org/id/draft-ietf-tcpm-initcwnd-08.txt This document proposes to raise the upper bound on TCP's initial window (IW) to 10 segments (maximum 14600B). It is patterned after and borrows heavily from RFC 3390 [RFC3390] and earlier work in this area. Due to lingering concerns about possible side effects to other flows sharing the same network bottleneck, some of the recommendations are conditional on additional monitoring and evaluation. My memory is that this draft was quite controversial and has not achieved Proposed Standard status. In general, the notion of allowing user tunability  of congestion control to do things which are not generally regarded as safe is a bit scary. But I could be off about the IETF status of IW10.  Yes, I get it that users can rebuild their kernels to do arbitrary things. Partly this is about not helping people without adequate technical skill to violate internet norms, and partly it's about setting expectations.
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