Yes, it can easily changed at runtime, but this is not the usage bug we
have.

All the users of Ubuntu Intrepid will get penalised by the poor scaling
and unfairness of TCP Reno (using blind congestion control [1]), which
is why TCP cubic was introduced and became default in 2.6.19, some 2
years ago; all the high-profile distros are sure to enable this per
default, since TCP Reno suffers in particular use patterns, such as
wireless (ie lossy net) throughput, fairness on congested networks (eg
xDSL), throughput on high BDP networks (eg internet), plus it'll get
worse as the bandwidth product of xDSL lines increased, but latency
doesn't decrease (due to c).

I want people using Intrepid to be able to achieve the best experience
on Ubuntu, not have to move to SuSE or Redhat, or publish benchmarks
showing penalties on Ubuntu (eg from Phoronix), but perhaps we have to
wait another 6 months again?

--- [1]

http://www.powerset.com/explore/semhtml/Taxonomy_of_congestion_control?query=CUBIC+TCP

-- 
2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
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