Re: [Codel] Floating an Idea. ip_fq_codel

[Andrew McGregor <andrewmcgr@gmail.com>]

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Ah, so it DOES support multiple flow hashes... I didn't know that.  Nice.


On Wed, May 21, 2014 at 1:31 AM, Eric Dumazet <eric.dumazet@gmail.com>wrote:

>
> On Tue, 2014-05-20 at 20:16 +1000, Andrew McGregor wrote:
> > That's about what constitutes a flow.  fq_codel as implemented in
> > linux works per (source ip, dest ip, protocol, source port, dest port)
> > 5-tuple.  Linux should probably support multiple flow hashing
> > algorithms in the kernel.
> >
>
> Right. fq_codel uses the same trick than other qdisc, like SFQ
>
> By _default_ it uses a 5-tuple hash. Thats convenient but not a
> requirement.
>
> You can classify packets using a filter and for example hash only on the
> part you need. For example destination IP, or source IP, depending if
> you use fq_codel on egress or ingress sides.
>
> tc qdisc add dev eth0 root handle 1: fq_codel flows 8192
> tc filter add dev eth0 protocol ip parent 1: handle 1 \
>         flow hash keys dst divisor 8192
>
> Simple as that.
>
> > On Tue, May 20, 2014 at 7:15 PM, Richard Edmands <thesirdmz@gmail.com>
> > wrote:
> >         In my environment we've got a fair chunk of torrent usage
> >         happening (+ gaming) and with fq_codel giving the advantage to
> >         whichever individual could open up as many connections as
> >         possible the entire situation imploded very quickly.
> >
> >         So to balance this out I used htb to implement the IP part of
> >         this (actually not really, i made groups of ip's which
> >         belonged to individuals) and stuck fq_codel on top of the
> >         divided setup.
> >
> >         With this system what now happens is each IP now gets equal
> >         utilization of the link (actually, i'm a lazy hack. I only
> >         implemented the uplink section) which prevents the advantage
> >         of opening up as many connections as possible.
> >         Now when an individual decides to go nuts, they're limited to
> >         what is available to them without harming everyone else,
> >         without compromising maximum possible speed.
> >
> >
> >         I have had this running in my environment for the past month
> >         and WOW.
> >
> >
> >         See pastebin'd implementation.
> >
> >
> >         http://pastebin.com/hXtzFL9f
> >
> >
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> >
> >
> >
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>

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