[Make-wifi-fast] Subject: R7800 & openwrt and smallnetbuilder

Fri May 29 13:50:19 EDT 2020

Hmmm...  wonder what Jim Salter's schedule book looks like?  ;-)

I was also hoping for a recent evaluation of the recent developments...
Heck, I've been waiting for a retake on Jim's articles on rolling your own
router on Ars Technia,  using OpenWrt and it performed admirably, but I
think it was before v16!  Probably more than time for a re evaluation, with
newer Cake and etc...  as well as evaluating the make-wifi-fast stuff on
the AP side of things...

Whaddya think Tim?   Is Jim burnt out on routers and wifi, or am I on to
something?  ;-)

On Thu, May 28, 2020, 9:00 AM <make-wifi-fast-request at lists.bufferbloat.net>
wrote:

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>    1. Re: REPOSTED: SmallNetBuilder Article: Does OFDMA really
>       work? Part 2 (Bob McMahon)
>    2. Re: REPOSTED: SmallNetBuilder Article: Does OFDMA really
>       work? Part 2 (Tim Higgins)
>    3. R7800 & openwrt and smallnetbuilder (Dave Taht)
>
>
>
> ---------- Forwarded message ----------
> From: Bob McMahon <bob.mcmahon at broadcom.com>
> To: Tim Higgins <tim at smallnetbuilder.com>
> Cc: Make-Wifi-fast <make-wifi-fast at lists.bufferbloat.net>
> Bcc:
> Date: Wed, 27 May 2020 10:16:23 -0700
> Subject: Re: [Make-wifi-fast] REPOSTED: SmallNetBuilder Article: Does
> OFDMA really work? Part 2
> I would make a small packet run too. For iperf2 use -l 40 and -b 20000pps
> and vary the pps number. I would hope that OFDMA would increase this.
>
> Also, don't forget about jitter - the derivative of latency. Some
> protocols care more about jitter than they do latency.
>
> I'd look into measuring the actual latency and jitter of the traffic vs
> using a ping as a proxy. This will be supported in iperf 2.0.14 using the
> write (server) side clock and --write-ack.  Better though is to synchronize
> the clocks and use one way trip times. While I like to synchronize the
> realtime clocks to the GPS atomic clock as the reference, using PTP and
> synchronizing to a common reference of any PC oscillator may be good
> enough. PTP stats will give you errors and corrections and per the
> corrections one can get an idea of the error.
>
> Thanks for posting. I really don't think OFDMA is going to affect such
> large latencies in a noticeable manner. I think it will be the ultra low
> latencies or near zero queuing that will matter.  For data center switches
> this is driven mostly by high frequency traders. For WiFi it's going to be
> newer games with VR/AR. Those latencies are going to need to be very low
> compared to today's use cases.
>
> my $0.02,
>
> Bob
>
> On Wed, May 27, 2020 at 7:37 AM Tim Higgins <tim at smallnetbuilder.com>
> wrote:
>
>> Tests have been redone and article is back up.
>> ===========================
>> Hi All,
>>
>> This article uses the benchmark test described in Part 1 to test 6 Wi-Fi
>> consumer routers. Results are not impressive.
>>
>> https://www.smallnetbuilder.com/wireless/wireless-features/33223-does-ofdma-really-work-part-2
>>
>> ===========
>> Tim
>> _______________________________________________
>> Make-wifi-fast mailing list
>> Make-wifi-fast at lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/make-wifi-fast
>
>
>
>
> ---------- Forwarded message ----------
> From: Tim Higgins <tim at smallnetbuilder.com>
> To: Bob McMahon <bob.mcmahon at broadcom.com>
> Cc: Make-Wifi-fast <make-wifi-fast at lists.bufferbloat.net>
> Bcc:
> Date: Thu, 28 May 2020 10:22:04 -0400
> Subject: Re: [Make-wifi-fast] REPOSTED: SmallNetBuilder Article: Does
> OFDMA really work? Part 2
> Hi Bob,
>
> Thanks for the suggestions. The iper2 suggests are for UDP, correct?
>
> As I said in the article, I'm done hunting this snark for now. Maybe
> others will take up the challenge.
> ===========
> Tim
> On 5/27/2020 1:16 PM, Bob McMahon wrote:
>
> I would make a small packet run too. For iperf2 use -l 40 and -b 20000pps
> and vary the pps number. I would hope that OFDMA would increase this.
>
> Also, don't forget about jitter - the derivative of latency. Some
> protocols care more about jitter than they do latency.
>
> I'd look into measuring the actual latency and jitter of the traffic vs
> using a ping as a proxy. This will be supported in iperf 2.0.14 using the
> write (server) side clock and --write-ack.  Better though is to synchronize
> the clocks and use one way trip times. While I like to synchronize the
> realtime clocks to the GPS atomic clock as the reference, using PTP and
> synchronizing to a common reference of any PC oscillator may be good
> enough. PTP stats will give you errors and corrections and per the
> corrections one can get an idea of the error.
>
> Thanks for posting. I really don't think OFDMA is going to affect such
> large latencies in a noticeable manner. I think it will be the ultra low
> latencies or near zero queuing that will matter.  For data center switches
> this is driven mostly by high frequency traders. For WiFi it's going to be
> newer games with VR/AR. Those latencies are going to need to be very low
> compared to today's use cases.
>
> my $0.02,
>
> Bob
>
> On Wed, May 27, 2020 at 7:37 AM Tim Higgins <tim at smallnetbuilder.com>
> wrote:
>
>> Tests have been redone and article is back up.
>> ===========================
>> Hi All,
>>
>> This article uses the benchmark test described in Part 1 to test 6 Wi-Fi
>> consumer routers. Results are not impressive.
>>
>> https://www.smallnetbuilder.com/wireless/wireless-features/33223-does-ofdma-really-work-part-2
>>
>> ===========
>> Tim
>> _______________________________________________
>> Make-wifi-fast mailing list
>> Make-wifi-fast at lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/make-wifi-fast
>
>
>
>
>
> ---------- Forwarded message ----------
> From: Dave Taht <dave.taht at gmail.com>
> To: Make-Wifi-fast <make-wifi-fast at lists.bufferbloat.net>
> Cc:
> Bcc:
> Date: Thu, 28 May 2020 08:28:05 -0700
> Subject: [Make-wifi-fast] R7800 & openwrt and smallnetbuilder
> I see that the R7800 is tim's goto router. I have one in a box...
> somewhere...
>
> A benchmark between the stock R7800 firmware and openwrt 19.03  on it
> would be nice to have. So far as I know
> most of the offloads are in 19.03. However, the work ongoing on the
> ath10k is pretty relevant, so A to B to C
> would be a good shower of progress.
>
> I figure tim is burned out totally on benchmarking wifi routers and is
> off restoring his karma by planting a garden or hopefully something
> relaxing like that(?), but I did manage to get most of my lab
> reassembled over the past few weeks.
>
>
> --
> "For a successful technology, reality must take precedence over public
> relations, for Mother Nature cannot be fooled" - Richard Feynman
>
> dave at taht.net <Dave Täht> CTO, TekLibre, LLC Tel: 1-831-435-0729
>
> _______________________________________________
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> Make-wifi-fast at lists.bufferbloat.net
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