Performance degradation over time

[Matthew Keeler]

I am using firmware version 10.2.4.70.9-2 (from the linux-firmware arch package). So it looks to be a little out of date. I will try the latest firmware and see if it fixes things.  

Thanks for the tips about the simulate firmware crash and the fw stats. 

--  
Matt Keeler

On March 8, 2016 at 11:32:58, Michal Kazior (michal.kazior at tieto.com(mailto:michal.kazior at tieto.com)) wrote:

> On 8 March 2016 at 15:09, Matthew Keeler wrote:
> >
> > I have an arch linux box running kernel version 4.4 and within it two Airetos AEX-QCA9880-NX cards in it. I have hostapd configured to use one for 2.4 GHz bgn and the other for 5 GHz n/ac. After a fresh boot of the box I can get about 50Mbps over 2.4 GHz using iperf and 350-400MBps over 5GHz. After a couple of days or so the performance of my 2.4GHz card is dropping to about 5Mbps. Has anyone else had similar issues with this kind of performance degradation or does anyone know a good place to start to try and figure why this could be happening.
> >
> > A couple things I have checked: nothing in dmesg, nothing abnormal in hostapd logs, restarting hostapd doesn’t seem to help, only rebooting helps.
>  
> Hi,
>  
> You didn't mention firmware version that you're using:
>  
> dmesg | grep ath10k.*firmware
>  
> From the looks of it it seems like a firmware (probably rate control
> module) issue and you can't do much in driver about that. At best you
> could force firmware reboot via debugfs to workaround the problem:
>  
> echo hw-restart > /sys/kernel/debug/ieee80211/phy0/ath10k/simulate_fw_crash
>  
> FWIW I suggest you to try out latest 10.2.4 if you didn't do that already, e.g.
>  
> https://github.com/kvalo/ath10k-firmware/blob/master/QCA988X/10.2.4/firmware-5.bin_10.2.4.70.22-2
>  
> I guess you could also try getting fw stats after fresh boot and then
> after the problem is observed and compare:
>  
> cat /sys/kernel/debug/ieee80211/phy0/ath10k/fw_stats
>  
>  
> Michał