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 wrote: > Send Make-wifi-fast mailing list submissions to > make-wifi-fast@lists.bufferbloat.net > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.bufferbloat.net/listinfo/make-wifi-fast > or, via email, send a message with subject or body 'help' to > make-wifi-fast-request@lists.bufferbloat.net > > You can reach the person managing the list at > make-wifi-fast-owner@lists.bufferbloat.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Make-wifi-fast digest..." > Today's Topics: > > 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 > To: Tim Higgins > Cc: Make-Wifi-fast > 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 > 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@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/make-wifi-fast > > > > > ---------- Forwarded message ---------- > From: Tim Higgins > To: Bob McMahon > Cc: Make-Wifi-fast > 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 > 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@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/make-wifi-fast > > > > > > ---------- Forwarded message ---------- > From: Dave Taht > To: Make-Wifi-fast > 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@taht.net CTO, TekLibre, LLC Tel: 1-831-435-0729 > > _______________________________________________ > Make-wifi-fast mailing list > Make-wifi-fast@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/make-wifi-fast