Since UDP seems to mostly not be effected, maybe it has something
to do with your tcp stack and/or congestion control?
You could sniff on the wlan0 interface, as well as on-air, and compare
timestamps
to see if the firmware is being slow about putting the TCP frames on the
air?
What TCP congestion control are you using?
And also, if there is any interference on the secondary channels, the NIC will
hold
off transmitting. So, you would not even see retransmits in this case.
Have you tried in regular managed mode (AP/STA) to see if it is the same with
CT firmware?
You could try stock firmware in AP/STA mode. If CT firmware shows
a regression, I will be happy to look at it.
Finally, you might try the latest CT firmware in case it acts better. I
ripped out some queue control in the non-full builds somewhat recently,
and possibly that would decrease latency.
Thanks,
Ben
On 04/30/2016 09:39 AM, Jose Núñez-Martínez (CTTC) wrote:
Hi all,
just to clarify, results are ms. And stations are in IBSS mode.
BW 20 MHz: TCP 0.9ms UDP 1.1ms
BW 40 MHz: TCP 7.7ms UDP 1.3ms
BW 80 MHz: TCP 3.5ms UDP 1.3ms
Behavior with 40MHz and 80MHz channel bandwidth is really weird taking into
account there are no retransmissions. Anyone facing this kind of problem?
Thanks,
Jose
On 04/29/2016 07:12 PM, Iñaki Pascual wrote:
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
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Ben Greear <[email protected]>
Candela Technologies Inc http://www.candelatech.com
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