[Cerowrt-devel] PIE and ADSL2+

Fred Stratton fredstratton at imap.cc
Fri Nov 22 04:31:34 EST 2013

Yes, PIE does apparently work better here than fq_codel. This is a 
subjective judgement. I have stopped using RRUL.

On 22/11/13 09:23, Sebastian Moeller wrote:
> Hi Fred,
> On Nov 22, 2013, at 10:15 , Fred Stratton <fredstratton at imap.cc> wrote:
>> Thank you.
>> Are you still using ADSL2+, Sebastian, or have you moved to fibre?
> 	Yes, I am still on ADSL2+ (16M downlink 2.5M uplink); I hope to switch to VDSL2 soon (50M down, 10M up), since real fiber is not offered where I live. For completeness I have shaped down and up link to 95% of the raw link-rate, and use simple qos, with tc_stab, link layer ADSL, overhead 40, and that seems to work well in my setup. My link is quite robust, that is I get a number of FECs but only few CRCs (and FECs do not require retransmission of cells and thus do not impact the effective link speed).
> 	I have one question, does PIE work better for you than fq_codel on your test load (i think you try to watch some videos while up- and downloading is ongoing)?
> best
> 	Sebastian
>> On 22/11/13 09:10, Sebastian Moeller wrote:
>>> Hi Fred,
>>> On Nov 20, 2013, at 11:08 , Fred Stratton <fredstratton at imap.cc> wrote:
>>>> I have been using PIE instead of fq_codel for approximately 10 days. It works well.
>>> 	Intrigued by your report I went ahead and tested simple.qos with fq_codel and pie (cerowrt 3.10.18-1) with rrul against  demo.tohojo.dk:
>>>   /netperf-wrapper -l 300 -H demo.tohojo.dk rrul -p all_scaled -t my_silly_name
>>> 	Pie (with the default target of 20ms(?) shows around 120 ms ping delay (fq_codel shows 45ms) also the average downlink with fq_codel is roughly 10% higher than with pie. So at least in that test fq_codel seems better than pie. That said, compared to ping latencies up to 300ms (my primary router somehow restricts ;agencies to roughly 300ms)  with no AQM, just rate shaping with HTB, pie still keeps the internet more useable.
>>>> Should it?
>>> 	I think its designers wanted it to be a competent disc, so I guess it should :)
>>>> Has PIE been optimized for ADSL?
>>> Best Regards
>>> 	Sebastian
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