Re: [Cake] Enforcing video quality question

["Jeremy Marks" <jmarks2@gmail.com>]

Thank you very much!

---Original Message-----
From: Cake <cake-bounces@lists.bufferbloat.net> On Behalf Of John Sager
Sent: Tuesday, February 23, 2021 6:15 AM
To: cake@lists.bufferbloat.net
Subject: Re: [Cake] Enforcing video quality question

Here is the toy QoS solution for linux, which is a simplified version of the one I uses successfully on my home network. It uses quite a few scheduler modules - sch_htb, act_connmark, em_meta etc - that may not load automatically, so they may need to be listed in /etc/modules.

Toke, thanks for agreeing to let the attachment through.

John

On 19/02/2021 19:04, John Sager wrote:
> Yes. The marks are set on egress so you can select on inside IP 
> address, port, protocol - in fact many characteristics that iptables 
> rules can test for. I'll put together a toy iptables rules file and a 
> toy script with the necessary tc commands. It'll take me a few days 
> though as I'm busy with other stuff currently.
> 
> PS does the cake list allow attachments? It will be a small zip file.
> 
> John
> 
> On 19/02/2021 15:02, Peter Lepeska wrote:
>> Hi John
>>
>> Does this result in the ability to set per internal host max ingress 
>> bandwidth? If so, any chance you can share a snippet of a script? I 
>> will be trying to reproduce your setup.
>>
>> Thank you!
>>
>> Peter
>>
>> On Fri, Feb 19, 2021 at 7:16 AM John Sager <john@sager.me.uk 
>> <mailto:john@sager.me.uk>> wrote:
>>
>>     That's basically what I do. I set marks on outgoing traffic in 
>> the mangle
>>     table which are copied to connmark before egress. Then on ingress 
>> the
>>     connmark is restored to the packet and punted to ifb0 using 
>> 'action
>>     connmark
>>     action mirred egress redirect dev $IFB' as an ingress filter on 
>> the
>>     incoming
>>     interface (ppp0 in my case). Then I have HTB classes on ifb0 
>> which set rate
>>     limits for different traffic classes indicated by the marks. I 
>> have only 6
>>     traffic classes (I bundle all video into one class), but as marks 
>> are 32
>>     bits wide there is lots of scope for classes for individual IP addresses.
>>
>>     John
>>
>>     On 18/02/2021 19:28, Toke Høiland-Jørgensen via Cake wrote:
>>      > Peter Lepeska <bizzbyster@gmail.com 
>> <mailto:bizzbyster@gmail.com>>
>>     writes:
>>      >
>>      >> A user on the OpenWrt forum suggested hashlimit rules 
>> supported by
>>      >> iptables. How does that idea sound to you?
>>      >
>>      > That will result in a cliff-edge policer (i.e., as soon as a 
>> device goes
>>      > over its limits it will see every packet get dropped). This 
>> doesn't
>>      > interact too well with the burstiness of TCP, so you'll likely 
>> get
>>      > erratic behaviour of the traffic if you do that. Doing the 
>> same thing
>>      > with HTB means the router will queue+shape each class (and 
>> with FQ-CoDel
>>      > on the leaves, you'll get a nice AQM behaviour as well), so 
>> that will be
>>      > smoother and less prone to bloat :)
>>      >
>>      > -Toke
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