Messages in this thread | | | Date | Tue, 30 Jul 2019 14:18:27 +0200 | From | Jean Delvare <> | Subject | NETIF_F_LLTX breaks iwlwifi |
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Hi Felix, Toke, Johannes,
After updating to kernel 5.2, I started losing wireless network on my workstation a few minutes after boot. I could restart the network service to get it back, but it would go away again a few minutes later. No error message logged, but somehow the network traffic was no long being processed.
My hardware is:
05:00.0 Network controller [0280]: Intel Corporation Wireless 8265 / 8275 [8086:24fd] (rev 78)
This is an Intel 8265 PCIe WiFI adapter by Gigabyte, model GC-WB867D-I, which worked flawlessly for me until then.
I bisected it down to:
commit 8dbb000ee73be2c05e34756739ce308885312a29 (refs/bisect/bad) Author: Felix Fietkau Date: Sat Mar 16 18:06:34 2019 +0100
mac80211: set NETIF_F_LLTX when using intermediate tx queues
So whatever the commit message says, it is apparently not safe to run TX handlers on multiple CPUs in parallel for this specific driver / device.
Unless someone has an immediate explanation as to why it broke the iwlwifi driver and the actual bug is in iwlwifi and it can be fixed quickly and easily there, I would suggest that the above commit is reverted for the time being, as apparently it wasn't fixing anything but was just a performance optimization.
I am available to do any amount of tests or debugging, given the guidance.
Thanks, -- Jean Delvare SUSE L3 Support
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