[Cake] [Codel] Proposing COBALT

[Benjamin Cronce]

On Tue, May 24, 2016 at 11:02 AM, Dave Taht <dave.taht at gmail.com> wrote:

> On Tue, May 24, 2016 at 9:56 AM, Jonathan Morton <chromatix99 at gmail.com>
> wrote:
> >
> >> On 24 May, 2016, at 18:52, Dave Täht <dave at taht.net> wrote:
> >>
> >> My last attempts with cake the way it was had it performing miserably at
> >> longer RTTs (try 50ms) vs codel or fq-codel - as in half the throughput
> >> achieved by codel, at that RTT.
> >
> > Was that before or after I found and fixed the invsqrt cache bug
> yesterday?
>
> That was back in december, when I had also ripped out the invsqrt
> cache entirely with things like "bcake".
>
> (I still do not see any point to the invsqrt cache, nor )
>
> I did some informal testing of recent cakes about a month back.. and
> went back to fq_codel. cake ate too much cpu, queue depth was longer,
> throughput at 50ms or longer, worse.
>
> I decided that I'd much rather work on wifi.
>
> Please test at longer rtts.
>

It seems to me that fq_codel works very well. If the main issue is hash
collisions, are there any plans to backport cake's "ways", which would make
fq_codel pretty close to perfect as an AQM. Possibly even allow reduction
of the hash-bucket sizes since they only scale with the log because of hash
birthday attacks.


>
>
>
>
> >  - Jonathan Morton
> >
> > _______________________________________________
> > Codel mailing list
> > Codel at lists.bufferbloat.net
> > https://lists.bufferbloat.net/listinfo/codel
>
>
>
> --
> Dave Täht
> Let's go make home routers and wifi faster! With better software!
> http://blog.cerowrt.org
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> Cake at lists.bufferbloat.net
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>
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