Performance issue with QCA9377

[Hugo Poissonnet]

Hello,
I recently get a laptop with a QCA9377 wifi chipset. I encountered major 
performance issue with kernel 4.4.0-53 (ubuntu generic build). I can 
connect to wifi network but performance are very bad below 1Mb/s (iperf 
with TCP). The network connection is very unstable, multiple disconnect 
in minutes.
I check the performance under Windows with same distance and same 
condition, I get 12Mb/s. So I upgrade to kernel 4.8.0-36 and performance 
are much better around 8Mb/s and no disconnection nor dmesg warn.

With 4.4 kernel in syslog/dmesg there is a lot of:
ath10k_pci 0000:02:00.0: no channel configured; ignoring frame(s)!
ath10k_warn: 217 callbacks suppressed

Sincerely yours,

Hugo Poissonnet