On 05.02.2017 20:30, Larry Finger wrote: > On 02/05/2017 05:34 AM, Dmitry Osipenko wrote: >> BTW, I have an issue with the 8192cu: WiFi stops to work after a while (3-15 >> minutes) if I enable WMM QoS on the AP. There is nothing suspicious in KMSG, >> connection is up but no packets go in/out. I tried to enable debug messages in >> the driver, so when the WiFi stops to work I see that some "temperature/led" >> notify still going on in the driver, but nothing happens when I try to initiate >> a transfer (say to open a web page) - the log is silent, like the requests are >> getting stuck/dropped somewhere before reaching the driver. Is it a known issue? >> With the QoS disabled everything works hunky-dory, however I get 2x-4x faster >> download speed with QoS enabled (while it works.) >> >> I noticed that rtl92c_init_edca_param() isn't wired in the driver, so I suppose >> the QoS isn't implemented yet, right? >> >> If it is an expected behaviour, I think at least printing a warning message in >> the KMSG like "QoS unimplemented, you may expect problems" should be good enough >> to avoid confusion. > > As you have already seen, I decided to defer the more invasive patch. When > backporting to stable, the smaller the change the better. That is a right approach. > I have no knowledge of the internals of the RTL8192CU chip. As a result, the > kinds of changes I can make are limited. I do know that the chip does implement > QoS. I also noticed that the set_qos() callback routine was very different in > rtl8192ce than in rtl8192cu. Attached is an untested patch to make the CU > routine look like the CE version. Please see if it makes a difference. Thank you a lot, unfortunately it doesn't help. > Driver rtl8192cu has never been maintained by Realtek, and it will likely be > removed from the kernel in the next few cycles. As you are running a new kernel, > I would recommend rtl8xxxu instead. That driver has high reliability, and the > speed is improving. Your other option would be a driver offered by the vendor of > your particular device. Realtek used to have these drivers on their web site, > but they now seem to have been removed. If your vendor does not have a driver, > http://www.edimax.com/edimax/mw/cufiles/files/download/Driver_Utility/transfer/Wireless/NIC/EW-7811Un/EW-7811Un_Linux_driver_v1.0.0.5.zip > should work. Oh, I wasn't aware of rtl8xxxu. Thought it is a driver for some other HW. Thanks a lot for pointing to it, will give it a whirl. I'm maintaining a personal fork of a downstream driver for a dozen kernel releases now, need a hostapd sometime. Fortunately, it's not a big burden. Thank you a lot again, keep up the good work. -- Dmitry
