[Cake] lan keyword affects host fairness
toke at toke.dk
Fri Nov 24 06:21:30 EST 2017
Dave Taht <dave at taht.net> writes:
> Pete Heist <peteheist at gmail.com> writes:
>> On Nov 23, 2017, at 10:44 AM, Jonathan Morton <chromatix99 at gmail.com> wrote:
>> This is most likely an interaction of the AQM with Linux' scheduling
>> At the 'lan' setting, the time comstants are similar in magnitude to the
>> delays induced by Linux itself, so congestion might be signalled
>> prematurely. The flows will then become sparse and total throughput reduced,
>> leaving little or no back-pressure for the fairness logic to work against.
> man page add:
> At the 'lan' setting(1ms), the time constants are similar in magnitude
> to the jitter in the Linux kernel itself, so congestion might be
> signalled prematurely. The flows will then become sparse and total
> throughput reduced, leaving little or no back-pressure for the fairness
> logic to work against. Use the "metro" setting for local lans unless you
> have a custom kernel.
Erm, doesn't this make the 'lan' keyword pretty much useless? So why not
just remove it? Or redefine it to something that actually works? 3ms?
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