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[Tutorial] - How to configure fq_codel for comcast to help bufferbloat / QoS

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theogravity:
Hi there,

After seeing a few threads on how to configure fq_codel / fq codel, I eventually figured out the right settings (I wouldn't say perfect) that will get myself an A on the bufferbloat report. This post is being created to for those who do not want to sift through forum threads and have the right info in one place to get this working.

This was written using the v18.1 opnsense firmware.

I am on Comcast with a 280 Mbps download (to 300 Mbps burst) and a 10 Mbps upload (to 12 Mbps burst) for reference.

For the quantum / limit values, I used this as a guide:

https://www.bufferbloat.net/projects/codel/wiki/Best_practices_for_benchmarking_Codel_and_FQ_Codel/

Note: Do NOT check the enable CoDel box at all in any of these steps. Make sure to hit the 'apply' button after you've added in each section to apply settings.

In the Firewall > Traffic Shaper

Create two pipes

Download Pipe:


--- Code: ---- Bandwidth: 280 Mbit/s
- queue: 2 (I found this was the best value so far after playing around with it)
- Scheduler type: FlowQueue-CoDel
- Enable (FQ-)CoDel ECN
- FQ-CoDel Quantum: 1000
- FQ-CoDel Limit: 1000
- description: I called mine "Download pipe"

--- End code ---

For quantum / limit, the rule seems to be 300 per 100 Mbps.

Upload Pipe:


--- Code: ---- Bandwidth: 11 Mbit/s
- Scheduler type: FlowQueue-CoDel
- Enable (FQ-)CoDel ECN
- description: I called mine "Upload pipe"

--- End code ---

(Note: I did not define a quantum / limit here.)

Create two queues

Download queue:


--- Code: ---- Pipe: Download pipe
- Weight: 100
- Enable (FQ-)CoDel ECN

--- End code ---

Upload queue:


--- Code: ---- Pipe: Upload pipe
- Weight: 100
- Enable (FQ-)CoDel ECN

--- End code ---

Create two rules

For the download rule:


--- Code: ---- Interface should be the WAN interface
- Target: download queue
- Protocol: ip
- Destination: The LAN network address. If you use an address of 192.168.1.x with a 255.255.255.0 subnet, the value will most likely be "192.168.1.0/24"

--- End code ---

I use a 172.16.0.x with a 255.255.0.0 subnet, so my value is 172.16.0.0/16

For the Upload rule:


--- Code: ---- Interface should be the WAN interface
- Target: upload queue
- Protocol: ip
- Source: The LAN network address. If you use an address of 192.168.1.x, the value will most likely be "192.168.1.0/24"

--- End code ---

It is important you use the correct network address. The 192.168.1.0/24 value in this context means that "for any IP address under this subnet (anything under 192.168.1.x)...":

- if source, apply the upload queue when the 192.168.1.x IPs are sending data out to WAN
- if destination, apply the download queue when the WAN is sending data to 192.168.1.x addresses

Now restart your router. The settings should take effect. You do not need to restart to modify any values (but don't forget to hit 'apply' after changes) at this point on.

Notes

In the traffic shaper GUI, if you go to status, you will get the WRONG information (I think it's a bug or it's using some incorrect flag to get status). Eg:

it says FIFO instead of FQ_CODEL for the type.


--- Code: ---Limiters:
10000: 280.000 Mbit/s    0 ms burst 0
q75536  50 sl. 0 flows (1 buckets) sched 10000 weight 0 lmax 0 pri 0 droptail
 sched 75536 type FIFO flags 0x0 0 buckets 0 active
10001:  11.000 Mbit/s    0 ms burst 0
q75537  50 sl. 0 flows (1 buckets) sched 10001 weight 0 lmax 0 pri 0 droptail
 sched 75537 type FIFO flags 0x0 0 buckets 0 active


Queues:
q10000  50 sl. 0 flows (1 buckets) sched 10001 weight 100 lmax 0 pri 0 droptail
q10001  50 sl. 0 flows (1 buckets) sched 10000 weight 100 lmax 0 pri 0 droptail

--- End code ---

If you want to verify your settings, you need to go into the shell and type:


--- Code: ---ipfw sched show
--- End code ---

And you should get something like this:


--- Code: ---10000: 280.000 Mbit/s    0 ms burst 0
q10000  50 sl. 0 flows (1 buckets) sched 10001 weight 100 lmax 0 pri 0 droptail
 sched 10000 type FQ_CODEL flags 0x0 0 buckets 1 active
 FQ_CODEL target 5ms interval 100ms quantum 1000 limit 1000 flows 1024 ECN
   Children flowsets: 10001
BKT Prot ___Source IP/port____ ____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp
  0 ip           0.0.0.0/0             0.0.0.0/0        1       83  0    0   0
10001:  11.000 Mbit/s    0 ms burst 0
q10001  50 sl. 0 flows (1 buckets) sched 10000 weight 100 lmax 0 pri 0 droptail
 sched 10001 type FQ_CODEL flags 0x0 0 buckets 0 active
 FQ_CODEL target 5ms interval 100ms quantum 1514 limit 600 flows 1024 ECN
   Children flowsets: 10000

--- End code ---

Hope this helps!

Using the above settings, you should get the best performance for upload, and near-best perf for downloads, resulting in an A rating.

Feel free to post better values if you have any!

franco:
Hi theogravity,

Thanks for this!

Moving this to the tutorial section. :)


Cheers,
Franco

odites999:
Great work theogravity!! Thanks so much. I've just setup it and it's working great.


Cheers!

odites999:
I've found another user sharing his experience: https://www.lullabot.com/articles/eliminating-robots-and-voip-glitches-with-active-queue-management. Andrew Berry gives us a similar setup with small diferences. Thanks Andrew!


Cheers!

donald24:
I would like to add up, that if you use IPv6 destination/source rules won't match an IPv4-rule, you would better be off setting both rules for up/down to any/any and setting only the direction correct in the rule.
This way it controls the full WAN-line.

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