Felix Fietkau <nbd@xxxxxxxx> writes: > On 12.07.24 04:23, Cedric Veilleux wrote: > >> AP mode. >> Both 2.4 and 5ghz channels. >> Using WLE600VX (QCA986x/988x), we are seeing the following errors in >> kernel logs: >> [12978.022077] ath10k_pci 0000:04:00.0: failed to flush transmit >> queue >> (skip 0 ar-state 1): 0 >> [13343.069189] ath10k_pci 0000:04:00.0: failed to flush transmit queue >> (skip 0 ar-state 1): 0 >> They are somewhat random but frequent. Can happen once a day or many >> times per hour. >> They are associated with 3-4 seconds of radio silence. Full packet >> loss. Then everything resumes normally, STA are still associated and >> traffic resumes. >> I have tested with major kernel versions: >> 6.1.97: stable (tested for many days on 10+ access points) >> 6.2.16: stable (tested for few hours single machine) >> 6.3.13: stable (tested for few hours single machine) >> 6.4.16: unstable (we have errors within an hour) >> 6.5.13: unstable (we have errors within an hour) >> 6.6.39: unstable (we have errors within an hour) >> 6.7.12: unstable (we have errors within an hour) >> 6.8.10: unstable (we have errors within an hour) >> 6.9.7: unstable (we have errors within an hour) >> From these tests I believe something changed in 6.4 series causing >> instabilities and the dreaded "failed to flush transmit queue" error. >> This is a custom linux distribution. Only change is the kernel. All >> other packages are same versions. Everything rebuilt from source using >> bitbake/yocto. Same linux-firmware files. > > I'm pretty sure it's caused by this commit: > > commit 0b75a1b1e42e07ae84e3a11d2368b418546e2bec > Author: Johannes Berg <johannes.berg@xxxxxxxxx> > Date: Fri Mar 31 16:59:16 2023 +0200 > > wifi: mac80211: flush queues on STA removal > > I guess somebody needs to look into making the queue flush on ath10k > more reliable (or even better, implement a more lightweight .flush_sta > op). > > I don't have time to do the work myself, but hopefully this > information could help somebody else take care of it. Adding ath10k list so that everyone see this. -- https://patchwork.kernel.org/project/linux-wireless/list/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
