Daniel Schaffrath wrote:
Dear Community,
sorry for the somewhat dumb question. Maybe someone has any pointer to
how to setup the RED queue to mark pakets with ECN. In particular what
are appropriate parameter settings for limit, min, max, etc.
I have never really played with red - but I wouldn't start by putting it
on lo - I don't think you will get a backlog. Even on root of an eth
there will be quite big buffer to fill before it gets any backlog.
You are best using it as a child of something that rate limits
tbf/hfsc/htb. There is a rate parameter which I guess you should use -
but it's not to actually do the rate limiting.
As for ECN, it's off by default on Linux, so I don't think it will be
much use unless you have control over the network. I just turned it on
on two of my PCs -
echo 1 > /proc/sys/net/ipv4/tcp_ecn
and did a test with red and it does work and save some drops.
Andy.
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