On Tue, Nov 4, 2014 at 2:59 AM, Yuchung Cheng [off-list ref] wrote:

Thanks for checking. So my suggested fix of removing the hold state is
the "less careful variant" that RFC does not recommend. I would rather
have the proposed 2-liner fix than implementing the section 6
heuristics to detect spurious retransmit. It's not worth the effort.
Everyone should use SACK.

Agreed. The simple 2-liner seems like the simplest and lowest-risk
fix. And given that >95% of public Internet flows and an even higher
proportion of datacenter flows use SACK, it's not worth spending time
optimizing NewReno.

neal