RT-AX56U iperf3 wifi speed 350Mbps from client to server and 900Mbps from server to client

KoKa · Sep 28, 2024

RT-AX56U
When testing wifi with iperf I have only ~350-400Mbps, when using reverse option I get ~900Mbps

I tried 2 latest official firmware 3.0.0.4.386_51679, 3.0.0.4.386.51665 and two merlin 3004.388.8_2, 3004.388.6_2. After each update I reset to factory then set up 5GHz network trough quick setup (just password and ssid) and tested that way, so settings were mostly automatic.
On both 3004.388.8_2, 3004.388.6_2 I tried all different settings in wifi section. For now I have set AX only 80 Mhz.
I tried disabling universal and AX beamforming, disabling OFDMA, to no difference (I'm actually surprised that disabling OFDMA still yields 800Mbps when reversed testing)
I have also tested in AC mode and speeds were as much asymmetric as in AX mode.

When I first bought the router I think I was getting 600-700 when iperf testing without reverse but it was long time ago. So I'm not sure if my router has somehow broken or it was like that from factory. I wish someone who also owns this router could test that.

(Testing with -P 2 or higher does not improve much, and -P 1 results were more compact to fit here)

Tests are made from wifi client to wired server:

client -> server

Code:

PS T:\_Downloads\iperf3.17.1_64> .\iperf3.exe -c 192.168.1.120 -B 192.168.1.157
Connecting to host 192.168.1.120, port 5201
[  5] local 192.168.1.157 port 65215 connected to 192.168.1.120 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.01   sec  21.1 MBytes   176 Mbits/sec
[  5]   1.01-2.01   sec  39.2 MBytes   329 Mbits/sec
[  5]   2.01-3.01   sec  43.9 MBytes   369 Mbits/sec
[  5]   3.01-4.01   sec  42.9 MBytes   360 Mbits/sec
[  5]   4.01-5.00   sec  44.2 MBytes   372 Mbits/sec
[  5]   5.00-6.00   sec  44.0 MBytes   370 Mbits/sec
[  5]   6.00-7.01   sec  44.6 MBytes   374 Mbits/sec
[  5]   7.01-8.01   sec  43.6 MBytes   366 Mbits/sec
[  5]   8.01-9.01   sec  42.5 MBytes   356 Mbits/sec
[  5]   9.01-10.01  sec  42.8 MBytes   358 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.01  sec   409 MBytes   343 Mbits/sec                  sender
[  5]   0.00-10.06  sec   405 MBytes   338 Mbits/sec                  receiver

server -> client

Code:

PS T:\_Downloads\iperf3.17.1_64> .\iperf3.exe -c 192.168.1.120 -B 192.168.1.157 -R
Connecting to host 192.168.1.120, port 5201
Reverse mode, remote host 192.168.1.120 is sending
[  5] local 192.168.1.157 port 65186 connected to 192.168.1.120 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.01   sec  95.5 MBytes   797 Mbits/sec
[  5]   1.01-2.01   sec   110 MBytes   922 Mbits/sec
[  5]   2.01-3.00   sec   107 MBytes   908 Mbits/sec
[  5]   3.00-4.01   sec   111 MBytes   926 Mbits/sec
[  5]   4.01-5.01   sec   110 MBytes   920 Mbits/sec
[  5]   5.01-6.00   sec   108 MBytes   913 Mbits/sec
[  5]   6.00-7.01   sec   111 MBytes   921 Mbits/sec
[  5]   7.01-8.01   sec   109 MBytes   916 Mbits/sec
[  5]   8.01-9.01   sec   108 MBytes   916 Mbits/sec
[  5]   9.01-10.01  sec   113 MBytes   941 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.02  sec  1.06 GBytes   910 Mbits/sec    0             sender
[  5]   0.00-10.01  sec  1.06 GBytes   908 Mbits/sec                  receiver

client -> server (wired)

Code:

PS T:\_Downloads\iperf3.17.1_64> .\iperf3.exe -c 192.168.1.120 -B 192.168.1.130
Connecting to host 192.168.1.120, port 5201
[  5] local 192.168.1.130 port 49349 connected to 192.168.1.120 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   115 MBytes   960 Mbits/sec
[  5]   1.00-2.00   sec   111 MBytes   936 Mbits/sec
[  5]   2.00-3.00   sec   114 MBytes   950 Mbits/sec
[  5]   3.00-4.01   sec   114 MBytes   949 Mbits/sec
[  5]   4.01-5.00   sec   113 MBytes   948 Mbits/sec
[  5]   5.00-6.01   sec   114 MBytes   950 Mbits/sec
[  5]   6.01-7.00   sec   113 MBytes   949 Mbits/sec
[  5]   7.00-8.00   sec   113 MBytes   949 Mbits/sec
[  5]   8.00-9.01   sec   114 MBytes   948 Mbits/sec
[  5]   9.01-10.00  sec   112 MBytes   950 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.00  sec  1.10 GBytes   949 Mbits/sec                  sender
[  5]   0.00-10.06  sec  1.10 GBytes   943 Mbits/sec                  receiver

I tried another wifi client (quest2):

client -> server

Code:

T:\_Downloads>adb shell /data/local/tmp/iperf3.17.1 -c 192.168.1.120
Connecting to host 192.168.1.120, port 5201
[  5] local 192.168.1.192 port 39614 connected to 192.168.1.120 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  30.1 MBytes   252 Mbits/sec   22    156 KBytes
[  5]   1.00-2.00   sec  33.6 MBytes   282 Mbits/sec    7    229 KBytes
[  5]   2.00-3.00   sec  34.2 MBytes   287 Mbits/sec    5    170 KBytes
[  5]   3.00-4.00   sec  35.9 MBytes   301 Mbits/sec    9    173 KBytes
[  5]   4.00-5.00   sec  35.2 MBytes   296 Mbits/sec   24    188 KBytes
[  5]   5.00-6.00   sec  33.4 MBytes   280 Mbits/sec   14    191 KBytes
[  5]   6.00-7.00   sec  31.9 MBytes   267 Mbits/sec   19    150 KBytes
[  5]   7.00-8.00   sec  29.9 MBytes   251 Mbits/sec    4    181 KBytes
[  5]   8.00-9.00   sec  29.8 MBytes   250 Mbits/sec    7    191 KBytes
[  5]   9.00-10.00  sec  29.4 MBytes   246 Mbits/sec    7    151 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   323 MBytes   271 Mbits/sec  118             sender
[  5]   0.00-10.03  sec   323 MBytes   270 Mbits/sec                  receiver

server -> client

Code:

T:\_Downloads>adb shell /data/local/tmp/iperf3.17.1 -c 192.168.1.120 -P 1 -R
Connecting to host 192.168.1.120, port 5201
Reverse mode, remote host 192.168.1.120 is sending
[  5] local 192.168.1.192 port 39898 connected to 192.168.1.120 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec  77.6 MBytes   650 Mbits/sec
[  5]   1.00-2.00   sec  80.9 MBytes   679 Mbits/sec
[  5]   2.00-3.00   sec  75.6 MBytes   634 Mbits/sec
[  5]   3.00-4.00   sec  78.2 MBytes   656 Mbits/sec
[  5]   4.00-5.00   sec  79.8 MBytes   669 Mbits/sec
[  5]   5.00-6.00   sec  76.1 MBytes   639 Mbits/sec
[  5]   6.00-7.00   sec  75.9 MBytes   636 Mbits/sec
[  5]   7.00-8.00   sec  75.4 MBytes   632 Mbits/sec
[  5]   8.00-9.00   sec  74.8 MBytes   627 Mbits/sec
[  5]   9.00-10.00  sec  79.9 MBytes   670 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.03  sec   778 MBytes   650 Mbits/sec    0             sender
[  5]   0.00-10.00  sec   774 MBytes   649 Mbits/sec                  receiver

Other router test (Cudy WR3000):

client -> server

Code:

PS T:\_Downloads\iperf3.17.1_64> .\iperf3.exe -c 192.168.8.105 -B 192.168.8.206
Connecting to host 192.168.8.105, port 5201
[  5] local 192.168.8.206 port 57756 connected to 192.168.8.105 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   101 MBytes   845 Mbits/sec
[  5]   1.00-2.00   sec   106 MBytes   891 Mbits/sec
[  5]   2.00-3.01   sec   105 MBytes   871 Mbits/sec
[  5]   3.01-4.01   sec   105 MBytes   880 Mbits/sec
[  5]   4.01-5.02   sec   106 MBytes   888 Mbits/sec
[  5]   5.02-6.00   sec   107 MBytes   907 Mbits/sec
[  5]   6.00-7.00   sec   104 MBytes   877 Mbits/sec
[  5]   7.00-8.01   sec   105 MBytes   872 Mbits/sec
[  5]   8.01-9.01   sec   104 MBytes   867 Mbits/sec
[  5]   9.01-10.01  sec   106 MBytes   886 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.01  sec  1.02 GBytes   878 Mbits/sec                  sender
[  5]   0.00-10.06  sec  1.02 GBytes   874 Mbits/sec                  receiver

server -> client

Code:

PS T:\_Downloads\iperf3.17.1_64> .\iperf3.exe -c 192.168.8.105 -B 192.168.8.206 -R
Connecting to host 192.168.8.105, port 5201
Reverse mode, remote host 192.168.8.105 is sending
[  5] local 192.168.8.206 port 57721 connected to 192.168.8.105 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   110 MBytes   924 Mbits/sec
[  5]   1.00-2.00   sec   112 MBytes   938 Mbits/sec
[  5]   2.00-3.01   sec   114 MBytes   942 Mbits/sec
[  5]   3.01-4.01   sec   111 MBytes   936 Mbits/sec
[  5]   4.01-5.01   sec   111 MBytes   931 Mbits/sec
[  5]   5.01-6.01   sec   111 MBytes   936 Mbits/sec
[  5]   6.01-7.01   sec   113 MBytes   943 Mbits/sec
[  5]   7.01-8.01   sec   112 MBytes   936 Mbits/sec
[  5]   8.01-9.01   sec   111 MBytes   934 Mbits/sec
[  5]   9.01-10.01  sec   112 MBytes   940 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.06  sec  1.09 GBytes   934 Mbits/sec    0             sender
[  5]   0.00-10.01  sec  1.09 GBytes   936 Mbits/sec                  receiver

u.pushken · Sep 28, 2024

seriously?

Tech9 · Sep 28, 2024

u.pushken said:
seriously?

Environment noise (-88dBm, good) is different than signal level (-41dBm, excellent). You mixed the two.

Ripshod · Sep 28, 2024

u.pushken said:
seriously?

View attachment 61659

Don't confuse signal level (in this case -41dBm) with background noise (88dBm). Lower noise is better. Even by your chart the signal level is at least "excellent".

u.pushken · Sep 28, 2024

Tech9 said:
You mixed the two.

ok, sorry

u.pushken · Sep 28, 2024

I saw, sorry

KoKa · Sep 28, 2024

TLDR: I did not downgraded enough, 386.5_2 works.

I found this thread, specifically this post https://www.snbforums.com/threads/rt-ax56u-slow-iperf3-in-one-direction.79784/#post-779022
And I can confirm, older firmware works I'm on 386.5_2 and anything newer (it being official asus firmware or merlin) falls back to 350Mbps.
Wonder if it is something that could be fixed, but since this thread is from 2022 I guess not.

client -> server

- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate
[ 5] 0.00-60.01 sec 5.87 GBytes 840 Mbits/sec sender
[ 5] 0.00-60.06 sec 5.87 GBytes 839 Mbits/sec receiver

server -> client

- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-60.01 sec 6.58 GBytes 942 Mbits/sec 0 sender
[ 5] 0.00-60.00 sec 6.58 GBytes 942 Mbits/sec receiver

EDIT: More results from quest 2 client:

client -> server Code: `PS T:\_Downloads\iperf3.17.1_64> adb shell /data/local/tmp/iperf3.17.1 -c 192.168.1.120 -t 60 Connecting to host 192.168.1.120, port 5201 [ 5] local 192.168.1.192 port 46320 connected to 192.168.1.120 port 5201 ... - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-60.00 sec 4.54 GBytes 649 Mbits/sec 0 sender [ 5] 0.00-60.03 sec 4.54 GBytes 649 Mbits/sec receiver`
client -> server (P2) Code: PS T:\_Downloads\iperf3.17.1_64> adb shell /data/local/tmp/iperf3.17.1 -c 192.168.1.120 -t 60 -P 2 Connecting to host 192.168.1.120, port 5201 [ 5] local 192.168.1.192 port 46362 connected to 192.168.1.120 port 5201 [ 7] local 192.168.1.192 port 46364 connected to 192.168.1.120 port 5201 ... - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-60.00 sec 2.59 GBytes 371 Mbits/sec 0 sender [ 5] 0.00-60.04 sec 2.59 GBytes 371 Mbits/sec receiver [ 7] 0.00-60.00 sec 2.58 GBytes 369 Mbits/sec 0 sender [ 7] 0.00-60.04 sec 2.58 GBytes 369 Mbits/sec receiver [SUM] 0.00-60.00 sec 5.17 GBytes 740 Mbits/sec 0 sender [SUM] 0.00-60.04 sec 5.17 GBytes 740 Mbits/sec receiver
client -> server (P4) Code: PS T:\_Downloads\iperf3.17.1_64> adb shell /data/local/tmp/iperf3.17.1 -c 192.168.1.120 -t 60 -P 4 Connecting to host 192.168.1.120, port 5201 [ 5] local 192.168.1.192 port 46404 connected to 192.168.1.120 port 5201 [ 7] local 192.168.1.192 port 46406 connected to 192.168.1.120 port 5201 [ 9] local 192.168.1.192 port 46408 connected to 192.168.1.120 port 5201 [ 11] local 192.168.1.192 port 46410 connected to 192.168.1.120 port 5201 ... - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-60.00 sec 1.46 GBytes 209 Mbits/sec 3 sender [ 5] 0.00-60.05 sec 1.46 GBytes 209 Mbits/sec receiver [ 7] 0.00-60.00 sec 1.47 GBytes 210 Mbits/sec 1 sender [ 7] 0.00-60.05 sec 1.47 GBytes 210 Mbits/sec receiver [ 9] 0.00-60.00 sec 1.47 GBytes 210 Mbits/sec 0 sender [ 9] 0.00-60.05 sec 1.47 GBytes 210 Mbits/sec receiver [ 11] 0.00-60.00 sec 1.45 GBytes 208 Mbits/sec 1 sender [ 11] 0.00-60.05 sec 1.45 GBytes 208 Mbits/sec receiver [SUM] 0.00-60.00 sec 5.85 GBytes 837 Mbits/sec 5 sender [SUM] 0.00-60.05 sec 5.85 GBytes 837 Mbits/sec receiver	server -> client (P4) Code: PS T:\_Downloads\iperf3.17.1_64> adb shell /data/local/tmp/iperf3.17.1 -c 192.168.1.120 -t 60 -P 4 -R Connecting to host 192.168.1.120, port 5201 Reverse mode, remote host 192.168.1.120 is sending [ 5] local 192.168.1.192 port 46450 connected to 192.168.1.120 port 5201 [ 7] local 192.168.1.192 port 46452 connected to 192.168.1.120 port 5201 [ 9] local 192.168.1.192 port 46454 connected to 192.168.1.120 port 5201 [ 11] local 192.168.1.192 port 46456 connected to 192.168.1.120 port 5201 ... - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-60.03 sec 1.64 GBytes 235 Mbits/sec 0 sender [ 5] 0.00-60.00 sec 1.64 GBytes 235 Mbits/sec receiver [ 7] 0.00-60.03 sec 1.63 GBytes 233 Mbits/sec 0 sender [ 7] 0.00-60.00 sec 1.63 GBytes 233 Mbits/sec receiver [ 9] 0.00-60.03 sec 1.65 GBytes 237 Mbits/sec 0 sender [ 9] 0.00-60.00 sec 1.65 GBytes 236 Mbits/sec receiver [ 11] 0.00-60.03 sec 1.64 GBytes 234 Mbits/sec 0 sender [ 11] 0.00-60.00 sec 1.63 GBytes 234 Mbits/sec receiver [SUM] 0.00-60.03 sec 6.56 GBytes 939 Mbits/sec 0 sender [SUM] 0.00-60.00 sec 6.55 GBytes 938 Mbits/sec receiver
client -> server (P8) Code: PS T:\_Downloads\iperf3.17.1_64> adb shell /data/local/tmp/iperf3.17.1 -c 192.168.1.120 -t 60 -P 8 Connecting to host 192.168.1.120, port 5201 [ 5] local 192.168.1.192 port 46494 connected to 192.168.1.120 port 5201 [ 7] local 192.168.1.192 port 46496 connected to 192.168.1.120 port 5201 [ 9] local 192.168.1.192 port 46498 connected to 192.168.1.120 port 5201 [ 11] local 192.168.1.192 port 46500 connected to 192.168.1.120 port 5201 [ 13] local 192.168.1.192 port 46502 connected to 192.168.1.120 port 5201 [ 15] local 192.168.1.192 port 46504 connected to 192.168.1.120 port 5201 [ 17] local 192.168.1.192 port 46506 connected to 192.168.1.120 port 5201 [ 19] local 192.168.1.192 port 46508 connected to 192.168.1.120 port 5201 ... - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-60.00 sec 735 MBytes 103 Mbits/sec 0 sender [ 5] 0.00-60.05 sec 735 MBytes 103 Mbits/sec receiver [ 7] 0.00-60.00 sec 801 MBytes 112 Mbits/sec 1 sender [ 7] 0.00-60.05 sec 801 MBytes 112 Mbits/sec receiver [ 9] 0.00-60.00 sec 781 MBytes 109 Mbits/sec 0 sender [ 9] 0.00-60.05 sec 781 MBytes 109 Mbits/sec receiver [ 11] 0.00-60.00 sec 730 MBytes 102 Mbits/sec 1 sender [ 11] 0.00-60.05 sec 730 MBytes 102 Mbits/sec receiver [ 13] 0.00-60.00 sec 787 MBytes 110 Mbits/sec 0 sender [ 13] 0.00-60.05 sec 787 MBytes 110 Mbits/sec receiver [ 15] 0.00-60.00 sec 770 MBytes 108 Mbits/sec 40 sender [ 15] 0.00-60.05 sec 770 MBytes 108 Mbits/sec receiver [ 17] 0.00-60.00 sec 784 MBytes 110 Mbits/sec 0 sender [ 17] 0.00-60.05 sec 784 MBytes 110 Mbits/sec receiver [ 19] 0.00-60.00 sec 748 MBytes 105 Mbits/sec 0 sender [ 19] 0.00-60.05 sec 748 MBytes 104 Mbits/sec receiver [SUM] 0.00-60.00 sec 5.99 GBytes 858 Mbits/sec 42 sender [SUM] 0.00-60.05 sec 5.99 GBytes 857 Mbits/sec receiver

sfx2000 · Sep 28, 2024

Fun one depending on what version of iperf3...

iperf3 -c 192.168.1.120 -P 4 -Z -t 30 --bidir

KoKa · Sep 28, 2024

sfx2000 said:
Fun one depending on what version of iperf3...

iperf3 -c 192.168.1.120 -P 4 -Z -t 30 --bidir

is "-Z" the fun part or "--bidir"? Because:

Code:

T:\_Downloads\iperf3.17.1_64>iperf3.exe -c 192.168.1.120 -Z
iperf3: parameter error - this OS does not support sendfile

Without -Z it starts with TX being faster gradualy transitions to RX being faster

Code:

T:\_Downloads\iperf3.17.1_64>iperf3.exe -c 192.168.1.120 -P 4 --bidir -B 192.168.1.157 -t 30
Connecting to host 192.168.1.120, port 5201
[  5] local 192.168.1.157 port 59615 connected to 192.168.1.120 port 5201
[  7] local 192.168.1.157 port 59616 connected to 192.168.1.120 port 5201
[  9] local 192.168.1.157 port 59617 connected to 192.168.1.120 port 5201
[ 11] local 192.168.1.157 port 59618 connected to 192.168.1.120 port 5201
[ 13] local 192.168.1.157 port 59619 connected to 192.168.1.120 port 5201
[ 15] local 192.168.1.157 port 59620 connected to 192.168.1.120 port 5201
[ 17] local 192.168.1.157 port 59621 connected to 192.168.1.120 port 5201
[ 19] local 192.168.1.157 port 59622 connected to 192.168.1.120 port 5201
[ ID][Role] Interval           Transfer     Bitrate
[  5][TX-C]   0.00-1.00   sec  21.1 MBytes   176 Mbits/sec
[  7][TX-C]   0.00-1.00   sec  22.1 MBytes   185 Mbits/sec
[  9][TX-C]   0.00-1.00   sec  31.8 MBytes   265 Mbits/sec
[ 11][TX-C]   0.00-1.00   sec  18.1 MBytes   151 Mbits/sec
[SUM][TX-C]   0.00-1.00   sec  93.1 MBytes   778 Mbits/sec
[ 13][RX-C]   0.00-1.00   sec  7.00 MBytes  58.5 Mbits/sec
[ 15][RX-C]   0.00-1.00   sec  7.00 MBytes  58.5 Mbits/sec
[ 17][RX-C]   0.00-1.00   sec  7.00 MBytes  58.5 Mbits/sec
[ 19][RX-C]   0.00-1.00   sec  7.00 MBytes  58.5 Mbits/sec
[SUM][RX-C]   0.00-1.00   sec  28.0 MBytes   234 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[  5][TX-C]   1.00-2.01   sec  24.9 MBytes   208 Mbits/sec
[  7][TX-C]   1.00-2.01   sec  26.2 MBytes   219 Mbits/sec
[  9][TX-C]   1.00-2.01   sec  24.4 MBytes   203 Mbits/sec
[ 11][TX-C]   1.00-2.01   sec  21.6 MBytes   180 Mbits/sec
[SUM][TX-C]   1.00-2.01   sec  97.1 MBytes   811 Mbits/sec
[ 13][RX-C]   1.00-2.01   sec  3.38 MBytes  28.2 Mbits/sec
[ 15][RX-C]   1.00-2.01   sec  3.38 MBytes  28.2 Mbits/sec
[ 17][RX-C]   1.00-2.01   sec  3.38 MBytes  28.2 Mbits/sec
[ 19][RX-C]   1.00-2.01   sec  3.38 MBytes  28.2 Mbits/sec
[SUM][RX-C]   1.00-2.01   sec  13.5 MBytes   113 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[  5][TX-C]   2.01-3.00   sec  28.5 MBytes   241 Mbits/sec
[  7][TX-C]   2.01-3.00   sec  25.2 MBytes   214 Mbits/sec
[  9][TX-C]   2.01-3.00   sec  25.5 MBytes   216 Mbits/sec
[ 11][TX-C]   2.01-3.00   sec  21.4 MBytes   181 Mbits/sec
[SUM][TX-C]   2.01-3.00   sec   101 MBytes   851 Mbits/sec
[ 13][RX-C]   2.01-3.00   sec  3.38 MBytes  28.6 Mbits/sec
[ 15][RX-C]   2.01-3.00   sec  3.38 MBytes  28.6 Mbits/sec
[ 17][RX-C]   2.01-3.00   sec  3.38 MBytes  28.6 Mbits/sec
[ 19][RX-C]   2.01-3.00   sec  3.38 MBytes  28.6 Mbits/sec
[SUM][RX-C]   2.01-3.00   sec  13.5 MBytes   114 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
...
- - - - - - - - - - - - - - - - - - - - - - - - -
[  5][TX-C]  14.02-15.01  sec  12.8 MBytes   108 Mbits/sec
[  7][TX-C]  14.02-15.01  sec  9.62 MBytes  81.5 Mbits/sec
[  9][TX-C]  14.02-15.01  sec  11.6 MBytes  98.5 Mbits/sec
[ 11][TX-C]  14.02-15.01  sec  13.5 MBytes   114 Mbits/sec
[SUM][TX-C]  14.02-15.01  sec  47.5 MBytes   402 Mbits/sec
[ 13][RX-C]  14.02-15.01  sec  4.50 MBytes  38.1 Mbits/sec
[ 15][RX-C]  14.02-15.01  sec  4.38 MBytes  37.1 Mbits/sec
[ 17][RX-C]  14.02-15.01  sec  4.50 MBytes  38.1 Mbits/sec
[ 19][RX-C]  14.02-15.01  sec  54.8 MBytes   464 Mbits/sec
[SUM][RX-C]  14.02-15.01  sec  68.1 MBytes   577 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
...
- - - - - - - - - - - - - - - - - - - - - - - - -
[  5][TX-C]  21.00-22.01  sec  2.88 MBytes  24.0 Mbits/sec
[  7][TX-C]  21.00-22.01  sec  3.25 MBytes  27.1 Mbits/sec
[  9][TX-C]  21.00-22.01  sec  1.88 MBytes  15.6 Mbits/sec
[ 11][TX-C]  21.00-22.01  sec  2.75 MBytes  22.9 Mbits/sec
[SUM][TX-C]  21.00-22.01  sec  10.8 MBytes  89.7 Mbits/sec
[ 13][RX-C]  21.00-22.01  sec  9.12 MBytes  76.1 Mbits/sec
[ 15][RX-C]  21.00-22.01  sec  8.88 MBytes  74.0 Mbits/sec
[ 17][RX-C]  21.00-22.01  sec  9.50 MBytes  79.2 Mbits/sec
[ 19][RX-C]  21.00-22.01  sec  78.8 MBytes   657 Mbits/sec
[SUM][RX-C]  21.00-22.01  sec   106 MBytes   886 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
...
- - - - - - - - - - - - - - - - - - - - - - - - -
[  5][TX-C]  27.00-28.01  sec  2.38 MBytes  19.8 Mbits/sec
[  7][TX-C]  27.00-28.01  sec  3.00 MBytes  25.0 Mbits/sec
[  9][TX-C]  27.00-28.01  sec  1.75 MBytes  14.6 Mbits/sec
[ 11][TX-C]  27.00-28.01  sec  2.38 MBytes  19.8 Mbits/sec
[SUM][TX-C]  27.00-28.01  sec  9.50 MBytes  79.3 Mbits/sec
[ 13][RX-C]  27.00-28.01  sec  8.75 MBytes  73.0 Mbits/sec
[ 15][RX-C]  27.00-28.01  sec  8.62 MBytes  72.0 Mbits/sec
[ 17][RX-C]  27.00-28.01  sec  9.62 MBytes  80.3 Mbits/sec
[ 19][RX-C]  27.00-28.01  sec  79.1 MBytes   660 Mbits/sec
[SUM][RX-C]  27.00-28.01  sec   106 MBytes   886 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[  5][TX-C]  28.01-29.00  sec  3.00 MBytes  25.2 Mbits/sec
[  7][TX-C]  28.01-29.00  sec  3.62 MBytes  30.5 Mbits/sec
[  9][TX-C]  28.01-29.00  sec  1.75 MBytes  14.7 Mbits/sec
[ 11][TX-C]  28.01-29.00  sec  2.62 MBytes  22.1 Mbits/sec
[SUM][TX-C]  28.01-29.00  sec  11.0 MBytes  92.5 Mbits/sec
[ 13][RX-C]  28.01-29.00  sec  8.75 MBytes  73.5 Mbits/sec
[ 15][RX-C]  28.01-29.00  sec  8.50 MBytes  71.4 Mbits/sec
[ 17][RX-C]  28.01-29.00  sec  9.38 MBytes  78.8 Mbits/sec
[ 19][RX-C]  28.01-29.00  sec  78.8 MBytes   662 Mbits/sec
[SUM][RX-C]  28.01-29.00  sec   105 MBytes   886 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[  5][TX-C]  29.00-30.01  sec  2.62 MBytes  21.9 Mbits/sec
[  7][TX-C]  29.00-30.01  sec  2.38 MBytes  19.8 Mbits/sec
[  9][TX-C]  29.00-30.01  sec  2.38 MBytes  19.8 Mbits/sec
[ 11][TX-C]  29.00-30.01  sec  2.88 MBytes  23.9 Mbits/sec
[SUM][TX-C]  29.00-30.01  sec  10.2 MBytes  85.4 Mbits/sec
[ 13][RX-C]  29.00-30.01  sec  8.38 MBytes  69.8 Mbits/sec
[ 15][RX-C]  29.00-30.01  sec  8.25 MBytes  68.7 Mbits/sec
[ 17][RX-C]  29.00-30.01  sec  8.88 MBytes  73.9 Mbits/sec
[ 19][RX-C]  29.00-30.01  sec  79.4 MBytes   661 Mbits/sec
[SUM][RX-C]  29.00-30.01  sec   105 MBytes   874 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID][Role] Interval           Transfer     Bitrate         Retr
[  5][TX-C]   0.00-30.01  sec   360 MBytes   101 Mbits/sec                  sender
[  5][TX-C]   0.00-30.05  sec   356 MBytes  99.4 Mbits/sec                  receiver
[  7][TX-C]   0.00-30.01  sec   378 MBytes   106 Mbits/sec                  sender
[  7][TX-C]   0.00-30.05  sec   376 MBytes   105 Mbits/sec                  receiver
[  9][TX-C]   0.00-30.01  sec   415 MBytes   116 Mbits/sec                  sender
[  9][TX-C]   0.00-30.05  sec   413 MBytes   115 Mbits/sec                  receiver
[ 11][TX-C]   0.00-30.01  sec   388 MBytes   108 Mbits/sec                  sender
[ 11][TX-C]   0.00-30.05  sec   386 MBytes   108 Mbits/sec                  receiver
[SUM][TX-C]   0.00-30.01  sec  1.51 GBytes   431 Mbits/sec                  sender
[SUM][TX-C]   0.00-30.05  sec  1.50 GBytes   428 Mbits/sec                  receiver
[ 13][RX-C]   0.00-30.01  sec   173 MBytes  48.3 Mbits/sec    0             sender
[ 13][RX-C]   0.00-30.05  sec   171 MBytes  47.7 Mbits/sec                  receiver
[ 15][RX-C]   0.00-30.01  sec   170 MBytes  47.5 Mbits/sec    0             sender
[ 15][RX-C]   0.00-30.05  sec   169 MBytes  47.1 Mbits/sec                  receiver
[ 17][RX-C]   0.00-30.01  sec   180 MBytes  50.4 Mbits/sec    0             sender
[ 17][RX-C]   0.00-30.05  sec   178 MBytes  49.6 Mbits/sec                  receiver
[ 19][RX-C]   0.00-30.01  sec  1.36 GBytes   390 Mbits/sec    0             sender
[ 19][RX-C]   0.00-30.05  sec  1.36 GBytes   389 Mbits/sec                  receiver
[SUM][RX-C]   0.00-30.01  sec  1.87 GBytes   537 Mbits/sec    0             sender
[SUM][RX-C]   0.00-30.05  sec  1.87 GBytes   533 Mbits/sec                  receiver

sfx2000 · Sep 28, 2024

KoKa said:
is "-Z" the fun part or "--bidir"? Because:

Code:

T:\_Downloads\iperf3.17.1_64>iperf3.exe -c 192.168.1.120 -Z iperf3: parameter error - this OS does not support sendfile

Without -Z it starts with TX being faster gradualy transitions to RX being faster

The -Z option is OS specific - I'm on a real OS, not the Solitaire Shell, e.g. Windows

Anyways - the --bidir switch enables concurrent traffic uplink and downlink, so it's a good flex on your adapter...

I would do a -P4 for threads to really push the load into this setup - numbers for 1Gb ethernet...

[SUM][RX-C] 0.00-30.00 sec 3.25 GBytes 932 Mbits/sec 44 sender
[SUM][RX-C] 0.00-30.00 sec 3.24 GBytes 928 Mbits/sec receiver

Thread starter	Title	Forum	Replies	Date
T	Extreme slow speeds with two Asus RT-AX56U routers.	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	12	Dec 21, 2024
T	Confused about the status of RT-AX56U	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	1	Nov 19, 2024
B	urgently RT-AX56U modified	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	7	Jul 26, 2024
	Solved RT-AX56U AiMesh node unable to join Wifi network	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	8	Jun 26, 2024
A	RT-AX56U capping Gigabit speeds at ~90Mbps	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	18	Apr 15, 2024
	AiMesh reports a PHY rate of 1000+ Mbps, while iperf3 gets only 350 Mbps?	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	5	Feb 8, 2025
C	Need help with ASUS GT AXE 2.4Ghz band WIFI	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	10	Saturday at 6:34 AM
C	RT-AX86U Pro WIFI keeps restarting every hour	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	9	Apr 4, 2025
A	Will offloading routing from my main Asus router to pfSense improve wifi speeds?	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	3	Mar 27, 2025
B	Is my ASUS Zen WiFi AX XT8 bricked?	ASUS AX Routers & Adapters (Wi-Fi 6/6e)	1	Mar 27, 2025

Search

Search

RT-AX56U iperf3 wifi speed 350Mbps from client to server and 900Mbps from server to client

KoKa

New Around Here

u.pushken

New Around Here

Tech9

Part of the Furniture

Ripshod

Very Senior Member

u.pushken

New Around Here

u.pushken

New Around Here

KoKa

New Around Here

sfx2000

Part of the Furniture

KoKa

New Around Here

sfx2000

Part of the Furniture

Similar threads

Similar threads

Latest threads

Support SNBForums w/ Amazon

Sign Up For SNBForums Daily Digest

Members online