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Poor performance on 5G network with Intel 9000 series cards

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Hi all,

We found that Intel 9000 series wifi cards have tx performance issue
on 5G network.
Here are the test result.

Client(10.101.46.25) is the platform with 9260 wifi card on 5G
network, and server(10.101.46.219) is another machine with ethernet
network.

kernel v4.15-rc5 with firmware API 33

acelan@u-Kabylake-Client-platform ~ % iperf -c 10.101.46.219 -er
------------------------------------------------------------
Server listening on TCP port 5001 with pid 2248
Read buffer size: 1.44 KByte
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 10.101.46.219, TCP port 5001 with pid 2248
Write buffer size: 128 KByte
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 5] local 10.101.46.25 port 54308 connected with 10.101.46.219 port 5001
[ ID] Interval Transfer Bandwidth Write/Err Rtry Cwnd/RTT
[ 5] 0.00-11.06 sec 7.75 MBytes 5.88 Mbits/sec 1/0 77 7K/165143 us
[ 4] local 10.101.46.25 port 5001 connected with 10.101.46.219 port 38816
[ ID] Interval Transfer Bandwidth Reads Dist(bin=0.2K)
[ 4] 0.00-10.31 sec 77.0 MBytes 62.7 Mbits/sec 55729
49:23:176:59:1140:294:168:53820

------------------------------------------------------------

With firmware API 34, no luck

acelan@u-Kabylake-Client-platform ~ % iperf -c 10.101.46.219 -er
------------------------------------------------------------
Server listening on TCP port 5001 with pid 2138
Read buffer size: 1.44 KByte
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 10.101.46.219, TCP port 5001 with pid 2138
Write buffer size: 128 KByte
TCP window size: 187 KByte (default)
------------------------------------------------------------
[ 5] local 10.101.46.25 port 43560 connected with 10.101.46.219 port 5001
[ ID] Interval Transfer Bandwidth Write/Err Rtry Cwnd/RTT
[ 5] 0.00-10.01 sec 896 KBytes 733 Kbits/sec 1/0 58 7K/140474 us
[ 4] local 10.101.46.25 port 5001 connected with 10.101.46.219 port 38844
[ ID] Interval Transfer Bandwidth Reads Dist(bin=0.2K)
[ 4] 0.00-10.11 sec 79.8 MBytes 66.2 Mbits/sec 57744
37:6:191:52:1236:413:143:55666

Any ideas?

Best regards,
AceLan Kao.



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