Lossy cogent p2p experiences?

Thu Sep 7 00:39:05 UTC 2023

Benny Lyne Amorsen wrote:

> TCP looks quite different in 2023 than it did in 1998. It should handle
> packet reordering quite gracefully;

Maybe and, even if it isn't, TCP may be modified. But that
is not my primary point.

ECMP, in general, means pathes consist of multiple routers
and links. The links have various bandwidth and other
traffic may be merged at multi access links or on routers.

Then, it is hopeless for the load balancing points to
control buffers of the routers in the pathes and delays
caused by buffers, which makes per-packet load balancing
hopeless.

However, as I wrote to Mark Tinka;

: If you have multiple parallel links over which many slow
: TCP connections are running, which should be your assumption,

with "multiple parallel links", which are single hop
pathes, it is possible for the load balancing point
to control amount of buffer occupancy of the links
and delays caused by the buffers almost same, which
should eliminate packet reordering within a flow,
especially when " many slow TCP connections are
running".

And, simple round robin should be good enough
for most of the cases (no lab testing at all, yet).

A little more aggressive approach is to fully
share a single buffer by all the parallel links.
But as it is not compatible with router architecture
today, I did not proposed the approach.

					Masataka Ohta