netdev - TBF man page: peakrate must be greater than rate

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Message-ID: <CAD6Lk=r8Yf8_09X31bcLECEKmy3gS5rKDKt+pVHfyNk2_NMHTA@mail.gmail.com>
Date:   Fri, 3 Sep 2021 16:48:45 +0100
From:   Andy Walker <camtarn@...tarn.org>
To:     netdev@...r.kernel.org
Subject: TBF man page: peakrate must be greater than rate

Hi,

I was struggling with the following command line:
tc qdisc add dev eth1 parent 1:1 handle 10: tbf rate 10.0kbit maxburst
10kb latency 50ms peakrate 10kbit mtu 1600
RTNETLINK answers: Invalid argument

When I altered peakrate to be 10.1kbit, tbf accepted its parameters.

Looking in dmesg, I found the following:

sch_tbf: peakrate 1250 is lower than or equals to rate 1250

The man page does not specify that peakrate needs to be greater than
rate. This would probably be a useful addition, as it's easy to assume
that the two can/should be set to the same value for precise rate
limiting.

Thanks,
Andy