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Re: Odd TCP snd_cwnd behaviour, resulting in pathetic throughput? (Paul Ripke) writes:

>I've recently been trying to get duplicity running for backups of my
>main home server, out to the magical cloud (aws s3 to

>I have discovered that bandwidth oscillates in a sawtooth fashion,
>ramping up from near nothing, to saturate my uplink (somewhere around
>20-30Mbit/s), then I get a dropped packet, and it drops to near nothing
>and repeats, each cycle taking around a minute.

That could be someone doing bandwidth shaping on the connection.

If ALTQ is working (means: you need to bump HZ for modern network speeds),
you could try to throttle outgoing data with CBQ to see if the pattern
goes away.

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