TCP Congestion Control

[Kevin Bowling]

The per socket method is used at a large commercial CDN

On Thu, Oct 24, 2019 at 12:30 AM vm finance <vm.finance2 at gmail.com> wrote:

> Ok - I  see there is a socket option to pick a different cc per-socket
> basis.
> Any experiences on loading / using different cc per socket...does it work
> seamlessly?
>
> Thanks!
>
> On Wed, Oct 23, 2019 at 11:19 PM Kevin Oberman <rkoberman at gmail.com>
> wrote:
>
> > Have you loaded kernel modules for other algorithms? I believe only
> > newreno is in the default kernel. "man 4 mod_cc" for available modules
> and
> > other information.
> > --
> > Kevin Oberman, Part time kid herder and retired Network Engineer
> > E-mail: rkoberman at gmail.com
> > PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
> >
> >
> > On Wed, Oct 23, 2019 at 11:04 PM vm finance <vm.finance2 at gmail.com>
> wrote:
> >
> >> Hi,
> >>
> >> We can set per-socket congestion control under Linux, but not under
> >> FreeBSD
> >> (12.0).
> >> The current available and allowed is only newReno:
> >> net.inet.tcp.cc.available: newreno
> >> net.inet.tcp.cc.algorithm: newreno
> >>
> >> Any thoughts on why FreeBSD chose not to allow different cc to be set
> per
> >> socket?
> >> AFAIK, it would get complicated to have different sessions having
> >> different
> >> congestion algos.
> >>
> >> Thanks for any pointers!
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