Hi, Recent upgraded my wifi adapter from 8265 to 9260 of my ThinkPad X1C 6th gen. However the initial test is producing some unacceptable results: Furthermore, my desktop (intel 3168), and the original 8265 of my laptop also reproduce the same result. Kernels are the same 5.2.11-arch1-1-ARCH across my laptop and desktop. Tried lts (4.19) on my laptop, the same result. Even under Windows, it's all the same. [ 5] local 240e:3a1:c40:6c0::278 port 43334 connected to 240e:3a1:c40:6c0::16b port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 4.95 MBytes 41.5 Mbits/sec 0 219 KBytes [ 5] 1.00-2.00 sec 2.44 MBytes 20.5 Mbits/sec 0 248 KBytes [ 5] 2.00-3.00 sec 1.58 MBytes 13.3 Mbits/sec 1 1.39 KBytes [ 5] 3.00-4.00 sec 1.10 MBytes 9.21 Mbits/sec 44 194 KBytes [ 5] 4.00-5.00 sec 4.39 MBytes 36.8 Mbits/sec 0 226 KBytes [ 5] 5.00-6.00 sec 4.39 MBytes 36.8 Mbits/sec 0 247 KBytes [ 5] 6.00-7.00 sec 4.39 MBytes 36.8 Mbits/sec 0 257 KBytes [ 5] 7.00-8.00 sec 4.57 MBytes 38.3 Mbits/sec 0 259 KBytes [ 5] 8.00-9.00 sec 3.84 MBytes 32.2 Mbits/sec 0 259 KBytes [ 5] 9.00-10.00 sec 4.39 MBytes 36.8 Mbits/sec 0 261 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 36.0 MBytes 30.2 Mbits/sec 45 sender [ 5] 0.00-10.02 sec 34.9 MBytes 29.2 Mbits/sec receiver Yep, less than 40mbps using 5G. While I can even feel obvious lag when using ssh, some quick keystroke will easily cause a lag. I though it's the Linux support causing problem (even I'm using Arch with 5.2 kernel) for the newer 9260 card, then I switched back to 8265. But the same problem still exists!! What makes things even stranger, under Windows, it's all the same result. To exclude the problem of the AP, my android phone can easily get over 200mbps through the same AP. Furthermore, I tested my desktop which has an Intel 3168 card, and to my surprise, it's the same result less than 40mbps. Although it doesn't really hurt as both my desktop and laptop is mostly connected through ethernet, it still doesn't make sense to me. Here is the dmesg of my laptop. (Please ignore the perf buffer warning, as I also tried to trace iwlwifi:* and iwlwifi_msg:* events) https://paste.fedoraproject.org/paste/d5TO6kvbBOwQ~tkLgDbXsQ/raw The iw list output: https://paste.fedoraproject.org/paste/QKIOLyItCLcwTJoan8Wd3g/raw Any ideas how this could happen to 3 different intel cards on two different systems? (Although all running the same Arch kernel and latest firmware) Thanks, Qu
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