high RTT in 40 MHz channel width

[Iñaki Pascual]

Hi,

I am measuring TCP and UDP latency (actually RTT) and I am getting too 
high values when working with channels with 40MHz (also with 80MHz) width.

I am using hping3 for testing and these are the RTT avg values:

BW 20 MHz: TCP 0.9 UDP 1.1
BW 40 MHz: TCP 7.7 UDP 1.3
BW 80 MHz: TCP 3.5 UDP 1.3

I have tried different channels with similar results. According hping 
there are no packet loss and with wireshark I don't see any retransmission.

I am using:
driver: ath10k_pci
version: 4.2.0+
firmware-version: 10.1.467-ct-com-full-014-96d543

Any ideas?

Bests,

Iñaki