Hello,
I have test throughput with different 3 parameters. But the results are
similar. The data rate from PC via Client to the AP decreases
significantly comparing with the reverse direction.
During the test I also obverse the CPU load of client and AP. When the
data is sent from PC, the AP has ~2% CPU load, ~63 nic and ~25% sirq.
The client has ~0% CPU load ~78% nic and ~20% sirq. When the data sent
from AP, the AP has ~1% cpu ~69% nic and 7% sirq. The client has ~0%
cpu, 76% nic and ~24% sirq.
The test diagram is shown as
PC(GbE) --- (GbE)WDS Client (Wireless) --- (Wireless) WDS AP.
Did anyone else tries with such setup ?
On 23/03/16 18:20, Ben Greear wrote:
On 03/23/2016 09:54 AM, Michal Kazior wrote:
On 23 March 2016 at 11:53, Xue Liu <[email protected]> wrote:
Hello everyone,
Now I am doing point to point throughput test using and ath10k. The
hardwares are clearfog A1 board with armada 388 and WLE900VX
(QCA9880). The
OpenWRT trunk is running on it.
At first I did UDP throughput test ( WDS AP <---> WDS Client ) with
iperf3
server on the WDS AP. The throughput is approx 630 Mbps. But if the
server
sends the data, the throughput will rise to 700 Mbps. I did the
bidirectional test for many times. The UDP data transferring from AP
side
always has 70 - 80 Mbps more throughput.
In the same situation, I did UDP throughput test between PC and WDS
AP ( PC
<---->WDS Client <----> WDS AP ) . The PC is connected with the WDS
client
via GbE port. I have found a more interesting result. The data
throughput
is about 678 Mbps when the data is transmitted from AP to PC. There is
almost no performance loss. But the throughput is only about 425
Mpbs from
PC to AP.
Can anyone give me some advises or some info about the reason and
how to
improve the transmitting performance from PC to AP side. Thank you.
This is weird. Did you check CPU utilization on all involved devices
(PC, WDS Client, WDS AP)? Did you try tweaking iperf parameters, e.g.
number of threads, buffer sizes? Playing around with some parameters
could narrow down the problem.
Normally I would expect the reverse performance drop (i.e. slower
performance when traffic is generated locally on WDS Client).
I don't know about WDS, but we definitely see slower upload (from
station perspective)
than download rates, using identical hardware for AP and STA devices.
Patches posted to ath10k list yesterday claim to resolve at least some
of this,
but I have not tested those yet...
Thanks,
Ben
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