Question about ath10k throughput

[Shu, Nick]

Thanks, Ben:
We use our test application to generate traffic (TCP or UDP), sending from wifi NIC (ONLY 1 CLIENT, not multiple vStas). RF cables are used to connect from NIC antenna port (x3) to Cisco AP (model#3702E) antenna port (AP is placed inside an isolation chamber). Scan results for that AP shows the signal strength is -18 dBm  (strong enough).
AP is connected back to test server through Ethernet cable, then Network host is route back the data packet to test application.
So the data throughput is calculated as: number of bytes * 2 (round trip) * 8 = Mbps.

So far, we can only get like 400-500 Mbps for UDP.
Should we set AP to open? Without encryption?

Thanks!
Nick





-----Original Message-----
From: Ben Greear [mailto:greearb at candelatech.com] 
Sent: Tuesday, April 21, 2015 4:38 PM
To: Shu, Nick
Cc: ath10k at lists.infradead.org
Subject: Re: Question about ath10k throughput

On 04/21/2015 02:28 PM, Shu, Nick wrote:
> Hi, Group:
> I'm doing throughout measurement on QCA9880 chip, running ath10k 3.17 driver with firmware.
> I'm able to set channel width to 80MHz, enabled all three streams, MCS index to 9 for max. data throughput.
> I verified all initial setting are correct.
> But when test starts, MCS dropped (as the results of packet error?).
> Is there any app command to send to driver to lock the MCS index during the test, so we can see better throughput?
> What is the best practical number we can get for ath10k chip? 800? 900?

Please let us know more about your test setup:

Traffic protocol type (TCP, UDP, etc)

Over-the-air tests, or using cables + attenuators?

Is this in normal environment, or in an RF isolation chamber?

We've seen as much as 950Mbps UDP download using a certain Netgear AP, but it is not reproducible.  We normally do this type of test using sma cables + attenuators, and get mostly similar results whether in isolation chamber or not when cabled up as long as the RF spectrum is relatively quiet.

More often we see TCP in the 400-600 Mbps range and UDP in 700-800 Mbps range..and with TCP, it can also be tricky to get good throughput in our experience.

Increasing number of virtual stations decreases total throughput on most APs.

I have tried forcing the rate-control to run at specific (high) rates, but it has not increased throughput in tests so far, so I have not played with it that much.

Thanks,
Ben


> 
> Thanks!
> Nick Shu
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Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com