> On Jan 3, 2019, at 2:02 PM, Pete Heist <[email protected]> wrote:
>
> I tried iperf3 in UDP mode, but cake is treating these flows aggressively. I
> get the impression that cake penalizes flows heavily that do not respond to
> congestion control signals. If I pit one 8 TCP flows against a single UDP
> flow at 40mbit, the UDP flow goes into a death spiral with increasing drops
> over time (iperf3 output attached).
Sigh, this spiraling was partly because iperf3 in UDP mode sends 8k buffers by
default. If I use “-l 1472” with the iperf3 client, the send rates are the
same, but the packet loss is much lower, without interplanetary. So one more
result:
IP1 1-flow TCP up: 49 - 59.5
IP2 8-flow UDP 48-mbit up: 48 - 36 (loss 0% - 25%)
IP1 8-flow UDP 48-mbit down: 47.5 - 35.8 (loss 0% - 25%)
IP2 1-flow TCP down: 21.8 - 61.5
I do see the rates and loss gradually change over 60 seconds, so numbers are
shown at t=0 and t=60 seconds.
I’ve read that nuttcp does UDP bulk flows better than iperf3, so one day I may
try that.
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