[Cake] Getting Cake to work better with Steam and similar applications

[Dendari Marini]

Hello, thanks for all of your replies.

First of all, my connection encapsulation should be ATM LLC and it can
actually reach up to 17.5/1 Mbps, but that's kinda best case scenario which
is why I wanted to play it safe with just 16/.9 (which I should reach more
consistently).

Back to the Steam issue. Unfortunately I can't seem to get really
consistent results, mainly because sometimes it's downloading the game from
just a few connections and other times it's downloading from dozens and
dozens connections. The latter is the one giving me more issues both in
terms of latency/packet loss and in terms of evenly splitting the bandwidth
across the hosts.

One thing that seems to give better results is changing the interface where
Cake is used from eth0 to pppoe0. When I used fq_codel it seemed to give
better results when using eth0 and so I went ahead and did the same with
Cake.

Anyway more testing needed, will report if I notice any consistent result.

By the way this is the thread I opened on the Ubiquiti forums talking about
this issue (not sure if it can give you some more info):
https://community.ubnt.com/t5/EdgeMAX/Smart-Queue-seemingly-not-working-for-Steam-downloads/td-p/1890405
Also the thread where I got Cake for the ER-X from:
https://community.ubnt.com/t5/EdgeMAX/Cake-and-FQ-PIE-compiled-for-the-EdgeRouter-devices/td-p/1679844

On 20 April 2017 at 20:36, Sebastian Moeller <moeller0 at gmx.de> wrote:

>
> > On Apr 20, 2017, at 18:05, Dendari Marini <dendari92 at gmail.com> wrote:
> >
> > Hello, thanks for your reply.
> >
> > Looks like most of your options are okay, including the correct “dual”
> modes and “ingress” mode in the right place.  However, I think you need to
> adjust your bandwidth and overhead settings, otherwise Cake isn’t reliably
> in control of the bottleneck queues.  Try these to begin with:
> >
> > … bandwidth 850Kbit conservative dual-srchost nat
> >
> > … bandwidth 15Mbit conservative dual-dsthost nat ingress
> >
> > That should give you correct operation, and you can fine-tune from there.
> >
> > Just did quick test with your settings. First thing I noticed is my
> final download bandwidth is about 12Mbps, Steam on PC1 downloads at
> 1.4-1.5MB/s while downloading a file on PC2 seems to max out at ~250KB/s.
> From my understanding I should see each PC download at ~700KB/s, or am I
> mistaken?
>
> Assuming you measured good put in [M|K]iBytes this adds up to  1.5+0.25 =
> 1.75 * 1024^2 * 8 = 14680064 Bits or (1.4+0.25) * 8 *1024^2 / 1000^2 =
> 13.84 Mbps which seems a bit high for a 16Mbps ADSL link. I would ecpext
> something like 16 * (48/53)  * ((1500 - 8 - 20 -20) / (1500 + 32)) = 13.73
> Mbps TCP/IPv4 goodput… so you seem to be running close to theoretical
> maximum of your link (assuming I am not totally off with the overhead
> (estimated ADSL overhead on top of MTU: 6 destination MAC + 6 source MAC +
> 2 ethertype + 3 ATM LLC + 5 ATM SNAP + 2 ATM pad + 8 ATM AAL5 SAR 32
> bytes). But with your shaper set at 15Mbps without the atm option you will
> actually accept up to 15 * (53/48) = 16.5625 Mbps on the wire, which
> probably is above your link bandwidth. This fits well with the really low
> number of drops in your cake stats, you simply never have cake feel that
> shaping is needed?
>
> Best Regards
>
>
>
>
> >
> > On 20 April 2017 at 17:32, Jonathan Morton <chromatix99 at gmail.com>
> wrote:
> >
> >> On 20 Apr, 2017, at 18:23, Dendari Marini <dendari92 at gmail.com> wrote:
> >>
> >>> Could you post the output of calling “tc -s qdisc” here on the list
> please? That should allow to figure out what you actually told cake to do ;0
> >
> >> qdisc cake 8001: dev eth0 root refcnt 2 bandwidth 900Kbit diffserv3
> dual-srchost nat rtt 100.0ms raw
> >
> >> qdisc cake 8002: dev ifb4eth0 root refcnt 2 bandwidth 16Mbit diffserv3
> dual-dsthost nat ingress rtt 100.0ms raw
> >
> > Looks like most of your options are okay, including the correct “dual”
> modes and “ingress” mode in the right place.  However, I think you need to
> adjust your bandwidth and overhead settings, otherwise Cake isn’t reliably
> in control of the bottleneck queues.  Try these to begin with:
> >
> > … bandwidth 850Kbit conservative dual-srchost nat
> >
> > … bandwidth 15Mbit conservative dual-dsthost nat ingress
> >
> > That should give you correct operation, and you can fine-tune from there.
> >
> > - Jonathan Morton
> >
> >
> >
>
>
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