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hAP ac2: hardware offload decreases performance, vlan

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nemoforum
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hAP ac2: hardware offload decreases performance, vlan

Wed Apr 25, 2018 3:00 pm

Setup:
server2 - ISP - ether1-wan - hAP ac2 - ether2-vlan10 - server1

With hardware offload turned off on all interfaces iperf3 speed between server1 and server2 is around 800-900 Mbps in both directions.
If I turn hardware offload on, iperf3 speed server1 -> server2 drops to 280 Mbps. Server2 -> server1 speed is OK (800-900 Mbps).

What's wrong?

HW offload ON:
Code: Select all
user@server2:~$ iperf3 -c nemo.pp.ua
Connecting to host nemo.pp.ua, port 5201
[  4] local 10.0.91.2 port 37288 connected to 176.38.50.112 port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec   108 MBytes   902 Mbits/sec   31   1.26 MBytes
[  4]   1.00-2.00   sec   105 MBytes   878 Mbits/sec  131    356 KBytes
[  4]   2.00-3.00   sec   106 MBytes   888 Mbits/sec    0    542 KBytes
[  4]   3.00-4.00   sec   106 MBytes   891 Mbits/sec   11    375 KBytes
[  4]   4.00-5.00   sec   107 MBytes   897 Mbits/sec   11    390 KBytes
[  4]   5.00-6.00   sec   105 MBytes   881 Mbits/sec   13    403 KBytes
[  4]   6.00-7.00   sec  98.6 MBytes   827 Mbits/sec    0    559 KBytes
[  4]   7.00-8.00   sec   100 MBytes   843 Mbits/sec    9    520 KBytes
[  4]   8.00-9.00   sec   107 MBytes   900 Mbits/sec    3    544 KBytes
[  4]   9.00-10.00  sec   105 MBytes   877 Mbits/sec    2    373 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec  1.02 GBytes   878 Mbits/sec  211             sender
[  4]   0.00-10.00  sec  1.02 GBytes   875 Mbits/sec                  receiver

iperf Done.
user@server2:~$ iperf3 -c nemo.pp.ua -R
Connecting to host nemo.pp.ua, port 5201
Reverse mode, remote host nemo.pp.ua is sending
[  4] local 10.0.91.2 port 37292 connected to 176.38.50.112 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  25.3 MBytes   212 Mbits/sec
[  4]   1.00-2.00   sec  31.9 MBytes   268 Mbits/sec
[  4]   2.00-3.00   sec  33.9 MBytes   284 Mbits/sec
[  4]   3.00-4.00   sec  33.6 MBytes   282 Mbits/sec
[  4]   4.00-5.00   sec  34.0 MBytes   285 Mbits/sec
[  4]   5.00-6.00   sec  33.9 MBytes   284 Mbits/sec
[  4]   6.00-7.00   sec  33.7 MBytes   282 Mbits/sec
[  4]   7.00-8.00   sec  33.9 MBytes   284 Mbits/sec
[  4]   8.00-9.00   sec  33.5 MBytes   281 Mbits/sec
[  4]   9.00-10.00  sec  33.0 MBytes   277 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec   327 MBytes   274 Mbits/sec  76758             sender
[  4]   0.00-10.00  sec   327 MBytes   274 Mbits/sec                  receiver

iperf Done.

HW offload OFF:
Code: Select all
user@server2:~$ iperf3 -c nemo.pp.ua
Connecting to host nemo.pp.ua, port 5201
[  4] local 10.0.91.2 port 37296 connected to 176.38.50.112 port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec   107 MBytes   897 Mbits/sec   35    796 KBytes
[  4]   1.00-2.00   sec   106 MBytes   891 Mbits/sec   12    510 KBytes
[  4]   2.00-3.00   sec   106 MBytes   890 Mbits/sec    0    652 KBytes
[  4]   3.00-4.00   sec   105 MBytes   884 Mbits/sec   12    351 KBytes
[  4]   4.00-5.00   sec   106 MBytes   886 Mbits/sec    0    535 KBytes
[  4]   5.00-6.00   sec   106 MBytes   891 Mbits/sec    5    482 KBytes
[  4]   6.00-7.00   sec   107 MBytes   895 Mbits/sec    2    440 KBytes
[  4]   7.00-8.00   sec   106 MBytes   892 Mbits/sec    6    349 KBytes
[  4]   8.00-9.00   sec   107 MBytes   898 Mbits/sec    0    535 KBytes
[  4]   9.00-10.00  sec  95.7 MBytes   803 Mbits/sec   20    436 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec  1.03 GBytes   883 Mbits/sec   92             sender
[  4]   0.00-10.00  sec  1.02 GBytes   880 Mbits/sec                  receiver

iperf Done.
user@server2:~$ iperf3 -c nemo.pp.ua -R
Connecting to host nemo.pp.ua, port 5201
Reverse mode, remote host nemo.pp.ua is sending
[  4] local 10.0.91.2 port 37300 connected to 176.38.50.112 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  97.1 MBytes   814 Mbits/sec
[  4]   1.00-2.00   sec   108 MBytes   904 Mbits/sec
[  4]   2.00-3.00   sec   106 MBytes   885 Mbits/sec
[  4]   3.00-4.00   sec   107 MBytes   895 Mbits/sec
[  4]   4.00-5.00   sec   107 MBytes   894 Mbits/sec
[  4]   5.00-6.00   sec   104 MBytes   868 Mbits/sec
[  4]   6.00-7.00   sec   108 MBytes   902 Mbits/sec
[  4]   7.00-8.00   sec   108 MBytes   907 Mbits/sec
[  4]   8.00-9.00   sec   108 MBytes   910 Mbits/sec
[  4]   9.00-10.00  sec   107 MBytes   895 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec  1.03 GBytes   888 Mbits/sec  3620             sender
[  4]   0.00-10.00  sec  1.03 GBytes   888 Mbits/sec                  receiver

iperf Done.
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SergeyMorozov
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Posts: 17
Joined: Sun Apr 22, 2018 9:27 pm

Re: hAP ac2: hardware offload decreases performance, vlan

Wed Apr 25, 2018 11:04 pm

But I see the same iperf results in your post.
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squeeze
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Posts: 145
Joined: Thu Mar 22, 2018 7:53 pm

Re: hAP ac2: hardware offload decreases performance, vlan

Thu Apr 26, 2018 2:14 am

Why do you have two bridges? Only one of the bridges will benefit from hardware offloading.
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