Re: [Make-wifi-fast] [Cake] gaming dscp codepoint?

[Jim Gettys <jg@freedesktop.org>]

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My memory is that some games do set diffserv bits, but I don't remember
exactly which one is set by what games.  PFIFO-FAST reputedly had support
for that particular code point. (rather, PFIFO-FAST had some sort of
support, and the gamers noticed and some used it.

I mostly agree with the rest of Dave Reed's points, with some caveats.

On Wed, Jul 25, 2018 at 2:54 PM dpreed@deepplum.com <dpreed@deepplum.com>
wrote:

> I don't quite understand this. Diffserv may exist, but no Internet
> operators support it. It may be "supported" in edge devices, but since the
> "service" is in the network queueing, who cares?
>
> The Linux gamer market is rounding error in the global game community.
>
> And console gamers depend on the ISP's non-implementation.
>
> Caveat: I have said for years that diffserv's huge list of codepoints is
> essentially the result of a committee that has gone wild, creating a
> standard that is missing any useful path to adoption. There's no computable
> "translation" of the vague descriptions in the standard to a predictable
> router queueing behavior. This is super true in places like LTE, where you
> can observe bad congestion and bufferbloat even today.
>
> Discussing what codepoint means what is like discussing trivia about an
> imaginary fantasy land.
>
> -----Original Message-----
> From: "Dave Taht" <dave.taht@gmail.com>
> Sent: Tuesday, July 24, 2018 8:34pm
> To: "Jonathan Morton" <chromatix99@gmail.com>
> Cc: "Cake List" <cake@lists.bufferbloat.net>, "Make-Wifi-fast" <
> make-wifi-fast@lists.bufferbloat.net>
> Subject: Re: [Make-wifi-fast] [Cake] gaming dscp codepoint?
>
> On Tue, Jul 24, 2018 at 5:06 PM Jonathan Morton <chromatix99@gmail.com>
> wrote:
> >
> > > On 25 Jul, 2018, at 3:01 am, Dave Taht <dave.taht@gmail.com> wrote:
> > >
> > > cs4?
> > >
> > > cs4 and cs5 end up (typically) in the (oft buggy) linux vi queue on
> wifi.
> > >
> > > ef?
> > >
> > > do any of the gamers here observe any codepoints in use? When I
> > > surveyed this a few years ago, I saw very little usage, and what
> > > little there was was all over the map.
> >
> > If it were up to me,
>
> Wasn't my question. Do you observe any of your games using any codepoints?
>
> >I would use EF for realtime position/command updates and voice comms, CS0
> for everything non-time-critical (like matchmaking, garage, shop), and CS1
> for downloading patches.
>
> Well, I was leaning towards cs4. I no longer remember what ef maps
> into on linux wifi, particularly since qos_map_set was created for
> hostapd. Is openwrt tweaking that at all?
>
> These days my aps do not use 802.11e at all and I'm about to push a
> change forcing a max of 2ms per AC via the beacon.
>
> Clients on campus don't seem to use much dscp but I'm certainly seeing
> ecn from apple devices now.
>
>
> >
> > Reason is, EF is the only DSCP I can count on being interpreted as
> "latency sensitive" rather than "for video streaming".
> >
> >  - Jonathan Morton
> >
>
>
> --
>
> Dave Täht
> CEO, TekLibre, LLC
> http://www.teklibre.com
> Tel: 1-669-226-2619
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>
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