[Bloat] Thanks to developers / htb+fq_codel ISP shaper

[Robert Chacon]

> Cool! What kind of performance are you seeing? The README mentions being
> limited by the BPF hash table size, but can you actually shape 2000
> customers on one machine? On what kind of hardware and at what rate(s)?

On our production network our peak throughput is 1.5Gbps from 200 clients,
and it works very well.
We use a simple consumer-class AMD 2700X CPU in production because
utilization of the shaper VM is ~15% at 1.5Gbps load.
Customers get reliably capped within ±2Mbps of their allocated htb/fq_codel
bandwidth, which is very helpful to control network congestion.

Here are some graphs from RRUL performed on our test bench hypervisor:
https://raw.githubusercontent.com/rchac/LibreQoS/main/docs/fq_codel_1000_subs_4G.png
In that example, bandwidth for the "subscriber" client VM was set to 4Gbps.
1000 IPv4 IPs and 1000 IPv6 IPs were in the filter hash table of LibreQoS.
The test bench server has an AMD 3900X running Ubuntu in Proxmox. 4Gbps
utilizes 10% of the VM's 12 cores. Paravirtualized VirtIO network drivers
are used and most offloading types are enabled.
In our setup, VM networking multiqueue isn't enabled (it kept disrupting
traffic flow), so 6Gbps is probably the most it can achieve like this. Our
qdiscs in this VM may be limited to one core because of that.
I suspect in a non-virtualized setup, or one with multiqueue, it can handle
much more throughput.
Either way for now it's surprising to me how well it works and I'm just
grateful for it haha.
Kudos to you and your peers for making fq_codel so efficient!

- Robert

On Thu, Jan 14, 2021 at 12:46 PM Toke Høiland-Jørgensen <toke at toke.dk>
wrote:

> Robert Chacon <robert.chacon at jackrabbitwireless.com> writes:
>
> > Hello everyone,
> >
> > I am new here, my name is Robert. I operate a small ISP in the US. I
> wanted
> > to post here to thank Dave Täht, as well as the dozens of contributors to
> > the fq_codel and cake projects.
>
> Thank you for reaching out! It's always fun to hear about real-world
> deployments of this technology, and it's great to hear that it's working
> well for you! :)
>
> > I created a simple python application that uses htb+fq_codel to shape my
> > customers' traffic, and have seen great performance improvements. I am
> > maintaining it as an open source project for other ISPs to use at
> > https://github.com/rchac/LibreQoS
>
> Cool! What kind of performance are you seeing? The README mentions being
> limited by the BPF hash table size, but can you actually shape 2000
> customers on one machine? On what kind of hardware and at what rate(s)?
>
> -Toke
>


-- 
[image: photograph]


*Robert Chacón* Owner
*M* (915) 730-1472
*E* robert.chacon at jackrabbitwireless.com
*JackRabbit Wireless LLC*
P.O. Box 222111
El Paso, TX 79913
*jackrabbitwireless.com* <http://jackrabbitwireless.com>
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