Hello all, I've got a ath10k QCA6174 wireless device on my laptop which generally runs well, but after a few days of uptime with "normal" latency. I suddenly experience very high latency. I am measuring latency by pinging my access point. After a reboot it looks something like this: [1603195511.647411] 64 bytes from 192.168.0.185: icmp_seq=1 ttl=64 time=5.97 ms [1603195512.644271] 64 bytes from 192.168.0.185: icmp_seq=2 ttl=64 time=1.77 ms [1603195513.647936] 64 bytes from 192.168.0.185: icmp_seq=3 ttl=64 time=3.29 ms [1603195514.648112] 64 bytes from 192.168.0.185: icmp_seq=4 ttl=64 time=1.93 ms [1603195515.649151] 64 bytes from 192.168.0.185: icmp_seq=5 ttl=64 time=1.76 ms [1603195516.651775] 64 bytes from 192.168.0.185: icmp_seq=6 ttl=64 time=2.85 ms [1603195517.651775] 64 bytes from 192.168.0.185: icmp_seq=7 ttl=64 time=1.83 ms [1603195518.653779] 64 bytes from 192.168.0.185: icmp_seq=8 ttl=64 time=1.79 ms [1603195519.673433] 64 bytes from 192.168.0.185: icmp_seq=9 ttl=64 time=19.4 ms [1603195520.657162] 64 bytes from 192.168.0.185: icmp_seq=10 ttl=64 time=1.90 ms [1603195521.669162] 64 bytes from 192.168.0.185: icmp_seq=11 ttl=64 time=12.7 ms [1603195522.660162] 64 bytes from 192.168.0.185: icmp_seq=12 ttl=64 time=1.81 ms [1603195523.662202] 64 bytes from 192.168.0.185: icmp_seq=13 ttl=64 time=1.88 ms [1603195524.662584] 64 bytes from 192.168.0.185: icmp_seq=14 ttl=64 time=1.88 ms [1603195525.664175] 64 bytes from 192.168.0.185: icmp_seq=15 ttl=64 time=2.39 ms [1603195526.666592] 64 bytes from 192.168.0.185: icmp_seq=16 ttl=64 time=3.19 ms after a few days it will suddenly look like this: [1603387794.470254] 64 bytes from 192.168.0.185: icmp_seq=60939 ttl=64 time=4.33 ms [1603387795.487899] 64 bytes from 192.168.0.185: icmp_seq=60940 ttl=64 time=20.4 ms [1603387796.515681] 64 bytes from 192.168.0.185: icmp_seq=60941 ttl=64 time=46.8 ms [1603387797.542636] 64 bytes from 192.168.0.185: icmp_seq=60942 ttl=64 time=72.6 ms [1603387798.563217] 64 bytes from 192.168.0.185: icmp_seq=60943 ttl=64 time=91.3 ms [1603387799.474965] 64 bytes from 192.168.0.185: icmp_seq=60944 ttl=64 time=2.21 ms [1603387800.476286] 64 bytes from 192.168.0.185: icmp_seq=60945 ttl=64 time=2.08 ms [1603387801.613268] 64 bytes from 192.168.0.185: icmp_seq=60946 ttl=64 time=138 ms [1603387802.479966] 64 bytes from 192.168.0.185: icmp_seq=60947 ttl=64 time=3.19 ms [1603387803.479461] 64 bytes from 192.168.0.185: icmp_seq=60948 ttl=64 time=1.80 ms [1603387804.501875] 64 bytes from 192.168.0.185: icmp_seq=60949 ttl=64 time=22.1 ms [1603387805.528428] 64 bytes from 192.168.0.185: icmp_seq=60950 ttl=64 time=47.3 ms [1603387806.550368] 64 bytes from 192.168.0.185: icmp_seq=60951 ttl=64 time=67.7 ms [1603387807.496661] 64 bytes from 192.168.0.185: icmp_seq=60952 ttl=64 time=12.1 ms [1603387808.574657] 64 bytes from 192.168.0.185: icmp_seq=60953 ttl=64 time=88.7 ms [1603387809.616396] 64 bytes from 192.168.0.185: icmp_seq=60954 ttl=64 time=128 ms [1603387810.642946] 64 bytes from 192.168.0.185: icmp_seq=60955 ttl=64 time=153 ms [1603387811.493232] 64 bytes from 192.168.0.185: icmp_seq=60956 ttl=64 time=2.11 ms [1603387812.494298] 64 bytes from 192.168.0.185: icmp_seq=60957 ttl=64 time=1.84 ms [1603387813.512747] 64 bytes from 192.168.0.185: icmp_seq=60958 ttl=64 time=18.2 ms [1603387814.550750] 64 bytes from 192.168.0.185: icmp_seq=60959 ttl=64 time=54.8 ms [1603387815.640003] 64 bytes from 192.168.0.185: icmp_seq=60960 ttl=64 time=142 ms It will stay like that until I reboot at which point it will run normally again for a few days. I've tried installing various firmwares, and disabling power management, but that has not changed anything. I ran ping for a few days to pin point the exact time things go crazy and while i found a general timestamp, within a few seconds, there doesn't appear to be anything in syslog or kernel messages that would explain the abrupt change in behavior. I'm on kernel 5.4.0-52-generic (ubuntu 20.04.1). Some info about my hardware from the kernel: [Tue Oct 20 07:54:27 2020] ath10k_pci 0000:02:00.0: qca6174 hw3.2 target 0x05030000 chip_id 0x00340aff sub 1a56:143a [Tue Oct 20 07:54:27 2020] ath10k_pci 0000:02:00.0: kconfig debug 0 debugfs 1 tracing 1 dfs 0 testmode 0 [Tue Oct 20 07:54:27 2020] ath10k_pci 0000:02:00.0: firmware ver WLAN.RM.4.4.1-00157-QCARMSWPZ-1 api 6 features wowlan,ignore-otp,mfp crc32 90eebefb [Tue Oct 20 07:54:27 2020] ath10k_pci 0000:02:00.0: board_file api 2 bmi_id N/A crc32 fe1026b8 [Tue Oct 20 07:54:27 2020] ath10k_pci 0000:02:00.0: unsupported HTC service id: 1536 [Tue Oct 20 07:54:27 2020] ath10k_pci 0000:02:00.0: htt-ver 3.60 wmi-op 4 htt-op 3 cal otp max-sta 32 raw 0 hwcrypto 1 [Tue Oct 20 07:54:27 2020] ath10k_pci 0000:02:00.0 wlp2s0: renamed from wlan0 At this point I'm stumped. Does anyone have any pointers of where I might start looking (log files, debugging to enable, etc) in order to get to the bottom of this? I should also note that this system was previously running ubuntu 18.04 with kernel 5.3 and had no such issues. Thanks -- Uri
