From my observation, the speed issue only happens on tx. I use speedtest-cli the measure internet speed Download/Upload = 70.09 Mbits/s / 1.87 Mbit/s And use iperf to measure intranet speed with a server connected over ethernet cable Download/Upload = 78.6 Mbits/s / 1.51 Mbit/s The upload bandwidth we have is the same the download bandwidth, so both results are bad. acelan@u-Kabylake-Client-platform ~ % speedtest-cli Retrieving speedtest.net configuration... Testing from Taiwan Internet Gateway (175.41.48.77)... Retrieving speedtest.net server list... Selecting best server based on ping... Hosted by Asia Pacific Telecom (Taipei) [3.82 km]: 1.541 ms Testing download speed................................................................................ Download: 78.09 Mbit/s Testing upload speed................................................................................................ Upload: 1.87 Mbit/s acelan@u-Kabylake-Client-platform ~ % iperf -c 10.101.46.219 -er ------------------------------------------------------------ Server listening on TCP port 5001 with pid 27531 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 27531 Write buffer size: 128 KByte TCP window size: 85.0 KByte (default) ------------------------------------------------------------ [ 5] local 10.101.46.137 port 53328 connected with 10.101.46.219 port 5001 [ ID] Interval Transfer Bandwidth Write/Err Rtry Cwnd/RTT [ 5] 0.00-13.16 sec 2.38 MBytes 1.51 Mbits/sec 1/0 86 15K/137450 us [ 4] local 10.101.46.137 port 5001 connected with 10.101.46.219 port 51230 [ ID] Interval Transfer Bandwidth Reads Dist(bin=0.2K) [ 4] 0.00-10.21 sec 95.8 MBytes 78.6 Mbits/sec 69327 212:96:139:89:972:364:197:67258
More findings, using iperf to measure the speed for 60 seconds and report status every 10 seconds. The Tx speed is very unstable in the reports every 10 seconds, sometimes Tx speed is upto 50+MBits/sec, and sometimes it's slower than 1 MBits/sec. Card ID - CN-01RKV5-ITG00-781-02PK-X00 iperf(-t60 -i10) 1.26 1.78 0.419 1.15 16.7 56.8 MBits/sec speedtest-cli ~30 MBits/sec CARD ID - CN-01RKV5-ITG00-781-01Q9-X00 iperf(-t60 -i10) 54.1 22.8 13.7 2.10 1.47 5.56 MBits/sec speedtest-cli ~30 MBits/sec The iperf command I use is iperf -c 10.101.46.219 -r -t60 -i10 And on a machine with ethernet cable connected(ip:10.101.46.219) runs iperf -s
AceLan, can you provide a sniffer capture of this problem?
Sorry for not updating info here, this issue is result from our bad wifi AP, not Intel 9260. We've tried the test on 3 different wifi APs, and we only can reproduce this issue on one AP, other 2 APs are not infected.
what is the bad AP?