[Bloat] What is wrong with Microsoft's receive window auto-tuning?

[Eric Dumazet]

On Thu, 2014-09-11 at 19:40 +0200, Steinar H. Gunderson wrote:
> On Thu, Sep 11, 2014 at 10:05:46AM -0700, Eric Dumazet wrote:
> >> Is anyone aware of any research either pointing out how their tuning
> >> algorithm works, or of known bugs/problems with the algorithm?
> > How BDP suggests a receive window of 750k ?
> > 
> > If BDP _is_ 750k, then 3.8 MB receive window is not insane, it depends
> > on the amount of drops and how fast you want to recover from drops.
> 
> If it helps, I've seen problems in Linux' auto-tuning as well, so this is
> seemingly a hard problem :-)

Right. Note we did some changes in the DRS code in latest linux versions
(3.13 If I remember well)

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b0983d3c9b132c33b6fb2e28d157a1edc18a173c