Restarting Idle Connections

[hiren panchasara]

On 01/29/16 at 01:58P, hiren panchasara wrote:
> On 01/29/16 at 01:51P, hiren panchasara wrote:
> > On 01/29/16 at 01:38P, Yongmin Cho wrote:
> > > Hi, all.
> > > 
> > > I have an opinion about net.inet.tcp.initcwnd_segments.
> > > You know, snd_cwnd is restarted transmission after a long idle
> > > period(Current RTO).
> > > And, All of congestion control algorithm is using newreno_after_idle
> > > function after a long idle period.
> > > But, The newreno_after_idle function is not using initcwnd_segments.
> > > I think, The initcwnd_segments should be used in newreno_after_idle
> > > function, If the newreno_after_idle is called.
> > > I referred to rfc6928.
> > > 
> > > Please check my opinion.
> > 
> > You are absolutely right. We (FreeBSD) adopted initcwnd to be 10
> > segments but never bothered to update newreno_after_idle() function to
> > reflect that in calculating cwnd after idle period. Though the comments
> > in that function clearly says:
> > "The restart window is the initial window or the last CWND, whichever is
> > smaller."
> > 
> > I think we should make following change to accommodate it:
[snip]
https://reviews.freebsd.org/D5124

Cheers,
Hiren
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