[e2e] An alternative algorithm of calculating RTO

[Jason Gao]

>>If implemented all with integer operation and run on a modern 
>>high-frequency CPU with level-1 cache, the overhead of calculating cmrtt 
>>and crttvar my be trival.

>   I don't think the overhead really is as insignificant as you 
>suggest.  Network speeds are increasing much faster than CPU speeds, so 
>even if the cost is trivial now it won't necessarily remain trivial.
Well, compared to the overhead of context-switch on interrupt handling, I think the overhead of calculating cmrtt and crttvar may remain trivial.

Jason Gao.
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