Public bug reported:
I have noticed that simple Reno TCP congestion control isn't enabled in
the 2.6.27-4-generic kernel [1].
Upstream kernel sources default to the 'cubic' TCP congestion control
algorithm, which offers far better scaling on high bandwidth latency
product lines, and it suffers less packet loss collapse where stochastic
loss occurs eg on wireless networks. Additionally, cubic offers far
better fairness in the presence of congestion and multiple competing TCP
flows, thus greater efficiency is achieved.
Going back on the upstream kernel wisdom is a regression, moreover, I
thought cubic was default in Ubuntu kernels a while back.
Please update this as per upstream - this will bring Ubuntu inline with
most other distros which use this.
--- [1]
$ cat /proc/sys/net/ipv4/tcp_congestion_control
reno
$ grep CONFIG_DEFAULT_TCP_CONG /boot/config-2.6.27-4-generic
CONFIG_DEFAULT_TCP_CONG="reno"
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
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