Try a 160MHz channel as a workaround.
Are you using IPerf2 on the Mac to test it?
Tried that too but didn't help.
iperf3-darwin available on macOS
1 Like
dtaht seems to have found something
I have been trying to characterize a very difficult bug in the ac and
ax support on a new mt76 product, where
for mu-mimo and related, it seems to be generating an invalid or
flipped mac address on small (but not large) packets, eventually
getting through.This shows up in my flent data as huge swings in delay for tcp + voip
or ping - but not packet loss. Has anyone else seen this?
https://lists.openwrt.org/pipermail/openwrt-devel/2023-January/040356.html
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You can do the test in AX mode but using 20 MHz and 40 MHz width, to see if the results get better or worse.
Wait, how did you get the RTT time with iPerf3 ? 
Tried, it didn't help though.
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It's there by default on iperf3-darwin on macOS
==> Searching for similarly named formulae and casks...
Error: No formulae or casks found for iperf3-darwin.
What is iperf3-darwin?
Sorry I thought I got it from brew but seems to be there from default on macOS.
āÆ iperf3-darwin -v
iperf 3.8.1 - -- Apple version iperf3-88 (cJSON 1.7.13)
Darwin 22.2.0 Darwin Kernel Version 22.2.0: Fri Nov 11 02:06:26 PST 2022; root:xnu-8792.61.2~4/RELEASE_ARM64_T8112 arm64
Optional features available: sendfile / zerocopy
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Damn this has always been there and I have never noticed it, very useful for macOS/iOS, thanks!
2 Likes
How do you get it on iOS? For terminal there I use iSH which uses Alpine and it has some older version of iperf3 and no RTT.
True and correctā¦ but you can do the inverse 
run a server instance on the Mac and use an app of iperf3 on iOS (there are some on the App Store), then you can see the RTT time from the macOS instance/server.
Yes itās a bit stupid and this add the delay of the routing from the router/AP but is the only way Iāve found to test the delay from iOS. It can be useful to test the difference between one AP and another, not to test an āabsolute performanceā :
Example from my iPad Mini 6 to my MacBook Air (cabled to the router obviously)
% iperf3-darwin -s
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.1.128, port 49670
[ 5] local 192.168.1.10 port 5201 connected to 192.168.1.128 port 49671
[ 8] local 192.168.1.10 port 5201 connected to 192.168.1.128 port 49672
[ 10] local 192.168.1.10 port 5201 connected to 192.168.1.128 port 49673
[ 12] local 192.168.1.10 port 5201 connected to 192.168.1.128 port 49674
[ 14] local 192.168.1.10 port 5201 connected to 192.168.1.128 port 49675
[ ID] Interval Transfer Bitrate Retr Cwnd RTT
[ 5] 0.00-1.00 sec 14.8 MBytes 124 Mbits/sec 440192 754 KBytes 38ms
[ 8] 0.00-1.00 sec 15.1 MBytes 127 Mbits/sec 606712 791 KBytes 41ms
[ 10] 0.00-1.00 sec 17.6 MBytes 147 Mbits/sec 325800 987 KBytes 42ms
[ 12] 0.00-1.00 sec 15.1 MBytes 127 Mbits/sec 376480 993 KBytes 42ms
[ 14] 0.00-1.00 sec 15.1 MBytes 127 Mbits/sec 379376 1009 KBytes 42ms
[SUM] 0.00-1.00 sec 77.7 MBytes 652 Mbits/sec 2128560
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 1.00-2.00 sec 18.5 MBytes 155 Mbits/sec 79640 576 KBytes 27ms
[ 8] 1.00-2.00 sec 18.6 MBytes 156 Mbits/sec 79640 612 KBytes 27ms
[ 10] 1.00-2.00 sec 19.6 MBytes 164 Mbits/sec 70952 748 KBytes 28ms
[ 12] 1.00-2.00 sec 17.7 MBytes 148 Mbits/sec 33304 540 KBytes 23ms
[ 14] 1.00-2.00 sec 17.6 MBytes 148 Mbits/sec 41992 544 KBytes 23ms
[SUM] 1.00-2.00 sec 91.9 MBytes 771 Mbits/sec 305528
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 2.00-3.00 sec 19.7 MBytes 166 Mbits/sec 0 619 KBytes 28ms
[ 8] 2.00-3.00 sec 20.2 MBytes 169 Mbits/sec 0 652 KBytes 30ms
[ 10] 2.00-3.00 sec 22.2 MBytes 187 Mbits/sec 0 802 KBytes 36ms
[ 12] 2.00-3.00 sec 18.7 MBytes 157 Mbits/sec 0 577 KBytes 29ms
[ 14] 2.00-3.00 sec 18.8 MBytes 158 Mbits/sec 0 583 KBytes 29ms
[SUM] 2.00-3.00 sec 99.6 MBytes 836 Mbits/sec 0
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 3.00-4.00 sec 19.4 MBytes 163 Mbits/sec 0 648 KBytes 34ms
[ 8] 3.00-4.00 sec 19.9 MBytes 166 Mbits/sec 0 679 KBytes 37ms
[ 10] 3.00-4.00 sec 22.0 MBytes 184 Mbits/sec 0 837 KBytes 38ms
[ 12] 3.00-4.00 sec 18.5 MBytes 155 Mbits/sec 0 600 KBytes 28ms
[ 14] 3.00-4.00 sec 18.6 MBytes 156 Mbits/sec 0 607 KBytes 28ms
[SUM] 3.00-4.00 sec 98.3 MBytes 824 Mbits/sec 0
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 4.00-5.00 sec 19.8 MBytes 166 Mbits/sec 0 663 KBytes 21ms
[ 8] 4.00-5.00 sec 20.2 MBytes 170 Mbits/sec 0 693 KBytes 21ms
[ 10] 4.00-5.00 sec 22.0 MBytes 185 Mbits/sec 0 860 KBytes 22ms
[ 12] 4.00-5.00 sec 18.6 MBytes 156 Mbits/sec 0 612 KBytes 21ms
[ 14] 4.00-5.00 sec 18.8 MBytes 158 Mbits/sec 0 621 KBytes 21ms
[SUM] 4.00-5.00 sec 99.3 MBytes 834 Mbits/sec 0
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 5.00-6.00 sec 19.7 MBytes 165 Mbits/sec 0 670 KBytes 29ms
[ 8] 5.00-6.00 sec 19.9 MBytes 167 Mbits/sec 0 699 KBytes 29ms
[ 10] 5.00-6.00 sec 20.4 MBytes 171 Mbits/sec 88328 639 KBytes 29ms
[ 12] 5.00-6.00 sec 19.1 MBytes 160 Mbits/sec 0 638 KBytes 29ms
[ 14] 5.00-6.00 sec 19.0 MBytes 160 Mbits/sec 0 634 KBytes 29ms
[SUM] 5.00-6.00 sec 98.1 MBytes 822 Mbits/sec 88328
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 6.00-7.00 sec 19.8 MBytes 166 Mbits/sec 0 687 KBytes 30ms
[ 8] 6.00-7.00 sec 20.3 MBytes 170 Mbits/sec 0 731 KBytes 35ms
[ 10] 6.00-7.00 sec 19.7 MBytes 166 Mbits/sec 0 684 KBytes 30ms
[ 12] 6.00-7.00 sec 19.7 MBytes 165 Mbits/sec 0 680 KBytes 30ms
[ 14] 6.00-7.00 sec 19.6 MBytes 164 Mbits/sec 0 676 KBytes 30ms
[SUM] 6.00-7.00 sec 99.1 MBytes 831 Mbits/sec 0
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 7.00-8.00 sec 20.0 MBytes 168 Mbits/sec 0 728 KBytes 45ms
[ 8] 7.00-8.00 sec 20.4 MBytes 171 Mbits/sec 0 769 KBytes 45ms
[ 10] 7.00-8.00 sec 19.7 MBytes 165 Mbits/sec 0 713 KBytes 45ms
[ 12] 7.00-8.00 sec 19.8 MBytes 166 Mbits/sec 0 721 KBytes 45ms
[ 14] 7.00-8.00 sec 19.6 MBytes 164 Mbits/sec 0 717 KBytes 45ms
[SUM] 7.00-8.00 sec 99.6 MBytes 834 Mbits/sec 0
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 8.00-9.00 sec 19.5 MBytes 164 Mbits/sec 53576 550 KBytes 23ms
[ 8] 8.00-9.00 sec 19.8 MBytes 166 Mbits/sec 102808 580 KBytes 23ms
[ 10] 8.00-9.00 sec 19.1 MBytes 160 Mbits/sec 31856 526 KBytes 23ms
[ 12] 8.00-9.00 sec 19.2 MBytes 162 Mbits/sec 60816 554 KBytes 23ms
[ 14] 8.00-9.00 sec 19.2 MBytes 162 Mbits/sec 34752 543 KBytes 23ms
[SUM] 8.00-9.00 sec 96.9 MBytes 813 Mbits/sec 283808
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 9.00-10.00 sec 20.0 MBytes 168 Mbits/sec 0 625 KBytes 26ms
[ 8] 9.00-10.00 sec 20.4 MBytes 171 Mbits/sec 0 658 KBytes 26ms
[ 10] 9.00-10.00 sec 19.4 MBytes 163 Mbits/sec 0 567 KBytes 26ms
[ 12] 9.00-10.00 sec 19.9 MBytes 167 Mbits/sec 0 626 KBytes 26ms
[ 14] 9.00-10.00 sec 19.8 MBytes 166 Mbits/sec 0 617 KBytes 26ms
[SUM] 9.00-10.00 sec 99.6 MBytes 835 Mbits/sec 0
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 10.00-10.01 sec 147 KBytes 125 Mbits/sec 0 625 KBytes 33ms
[ 8] 10.00-10.01 sec 212 KBytes 181 Mbits/sec 0 658 KBytes 26ms
[ 10] 10.00-10.01 sec 147 KBytes 125 Mbits/sec 0 567 KBytes 26ms
[ 12] 10.00-10.01 sec 147 KBytes 125 Mbits/sec 0 626 KBytes 26ms
[ 14] 10.00-10.01 sec 127 KBytes 108 Mbits/sec 0 617 KBytes 26ms
[SUM] 10.00-10.01 sec 781 KBytes 665 Mbits/sec 0
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.01 sec 191 MBytes 160 Mbits/sec 573408 sender
[ 8] 0.00-10.01 sec 195 MBytes 163 Mbits/sec 789160 sender
[ 10] 0.00-10.01 sec 202 MBytes 169 Mbits/sec 516936 sender
[ 12] 0.00-10.01 sec 186 MBytes 156 Mbits/sec 470600 sender
[ 14] 0.00-10.01 sec 186 MBytes 156 Mbits/sec 456120 sender
[SUM] 0.00-10.01 sec 961 MBytes 805 Mbits/sec 2806224 sender
I have to check which options are compatible with iperf3 and iperf3-darwin!
PS: this is a bit off topic here. maybe we can continue in a new thread? Can be useful for iOS users (that are not few 
)
2 Likes
Hi,
I have the same issue. Currently I have switch to AC, until the AX issue is solved.
Thanks everyone for sharing. It help be figure out I was not alone, and the AC fallback workaround.
I will keep following this thread of updates and also the issue raised on Github : https://github.com/openwrt/mt76/issues/709
Don't hesitate to login to github and 
the issue, if you want it solved quicker 
Latest mt76 (not available from auc right now) seems to have fixed it.
3 Likes
Great news!!! Can't wait to try it out
Just tried the latest snapshot. Speed still off. Am I missing something here?
Yes, current master snapshot has problems with iwinfo: Transmit Power incorrect in snapshot. Breaking commit is from 2023-01-21. A fix has been proposed, but has not been merged yet.
1 Like