[Bloat] fq_codel settings for 25/3 connection?

[Bloat] fq_codel settings for 25/3 connection?

[John Klimek]

Does anybody have any suggested quantum/target values for a cable modem connection of 25/3?  (25 Mbps down, 3 Mbps up)

It looks like the defaults for Ubiquity EdgeRouter should work but I'm not sure if I can achieve better performance by tuning anything?

Also, should I enable fq_codel on my downstream or only my upstream?

Thanks!

- John

Re: [Bloat] fq_codel settings for 25/3 connection?

[Rosen Penev]

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No
Yes

On Tue, Feb 16, 2016, 10:06 John Klimek <jklimek@gmail.com> wrote:

> Does anybody have any suggested quantum/target values for a cable modem
> connection of 25/3?  (25 Mbps down, 3 Mbps up)
>
> It looks like the defaults for Ubiquity EdgeRouter should work but I'm not
> sure if I can achieve better performance by tuning anything?
>
> Also, should I enable fq_codel on my downstream or only my upstream?
>
> Thanks!
>
> - John
> _______________________________________________
> Bloat mailing list
> Bloat@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/bloat
>

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Re: [Bloat] fq_codel settings for 25/3 connection?

[Dave Taht]

On Tue, Feb 16, 2016 at 10:06 AM, John Klimek <jklimek@gmail.com> wrote:
> Does anybody have any suggested quantum/target values for a cable modem connection of 25/3?  (25 Mbps down, 3 Mbps up)

I would use a quantum 300 for the up. There is no need to fiddle with
the target values below 2.5mbits.

The edgerouter has issues with tcp offloads enabled. If you are not
using the other ports as routed ports, you can disable gro offloads on
all ports for lower latency at a huge cost in local bandwidth (this is
something that cake will fix if we can get ubnt to ship it one day.
http://www.bufferbloat.net/projects/codel/wiki/CakeTechnical )


>
> It looks like the defaults for Ubiquity EdgeRouter should work but I'm not sure if I can achieve better performance by tuning anything?

Make a change, measure with a good benchmark like flent's rrul test.

> Also, should I enable fq_codel on my downstream or only my upstream?

Both are severely overbuffered on cablemodems and CMTSes running at this speed.

http://burntchrome.blogspot.com/2014/05/fixing-bufferbloat-on-comcasts-blast.html

https://wiki.openwrt.org/doc/howto/sqm


> Thanks!
>
> - John
> _______________________________________________
> Bloat mailing list
> Bloat@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/bloat

Re: [Bloat] fq_codel settings for 25/3 connection?

[John Klimek]

Thanks very much for the information!  (I've been reading 20+ page threads on Ubiquity's forum looking for messages that you've posted)

I'm going to be testing an EdgeRouter X which doesn't support hardware acceleration so I don't think I have to worry about TCP offload (?).  (I'd like to use my existing x86 hardware but I can't find a solid router OS that I like)

I'll also go ahead and enable fq_codel on my downstream and hope for the best.

Thanks again,
John


> On Feb 16, 2016, at 2:19 PM, Dave Taht <dave.taht@gmail.com> wrote:
> 
>> On Tue, Feb 16, 2016 at 10:06 AM, John Klimek <jklimek@gmail.com> wrote:
>> Does anybody have any suggested quantum/target values for a cable modem connection of 25/3?  (25 Mbps down, 3 Mbps up)
> 
> I would use a quantum 300 for the up. There is no need to fiddle with
> the target values below 2.5mbits.
> 
> The edgerouter has issues with tcp offloads enabled. If you are not
> using the other ports as routed ports, you can disable gro offloads on
> all ports for lower latency at a huge cost in local bandwidth (this is
> something that cake will fix if we can get ubnt to ship it one day.
> http://www.bufferbloat.net/projects/codel/wiki/CakeTechnical )
> 
> 
>> 
>> It looks like the defaults for Ubiquity EdgeRouter should work but I'm not sure if I can achieve better performance by tuning anything?
> 
> Make a change, measure with a good benchmark like flent's rrul test.
> 
>> Also, should I enable fq_codel on my downstream or only my upstream?
> 
> Both are severely overbuffered on cablemodems and CMTSes running at this speed.
> 
> http://burntchrome.blogspot.com/2014/05/fixing-bufferbloat-on-comcasts-blast.html
> 
> https://wiki.openwrt.org/doc/howto/sqm
> 
> 
>> Thanks!
>> 
>> - John
>> _______________________________________________
>> Bloat mailing list
>> Bloat@lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/bloat