Fwd: Cannot achieve throughput higher than 460Mbps using CT firmware and 3x3 ath10k

[richard mayers]

---------- Forwarded message ----------
From: richard mayers <richard.mayers92 at gmail.com>
Date: 2015-05-07 9:51 GMT+02:00
Subject: Re: Cannot achieve throughput higher than 460Mbps using CT
firmware and 3x3 ath10k
To: Michal Kazior <michal.kazior at tieto.com>


Hi,

Yes, with only one spatial stream I can use MCS9 and I get 290Mbps
more or less, then with 2 spatial streams I can also use MCS 8, but as
I said with 3 streams  I only get a "good throughput" with  MC6.

Richard

2015-05-07 7:47 GMT+02:00 Michal Kazior <michal.kazior at tieto.com>:
> On 6 May 2015 at 17:01, richard mayers <richard.mayers92 at gmail.com> wrote:
>> Hi all,
>>
>> The maximum throughput I get with the following set up is around
>> 460-470Mbits/s when using MCS 6, 80MHz channel and 3 spatial streams.
>> However, when I try MCS 7, the throughput drops to 200Mbits/s, and
>> when I use 8 or 9 it goes to 0. The signal level is -11dBm which I
>> guess is quite good.
>
> Hmm.. From my experience too strong signal can degrade performance
> with qca988x. You could try reducing it via `iw`. You could also try
> checking if using only 2 spatial streams also yields problems with
> MCS8 and MCS9.
>
> Antenna themselves might be the problem as well. Strong signal doesn't
> mean good signal quality. If your antenna connector is damaged or
> antenna is of poor quality you might end up not being able to use
> highest MCS rates.
>
>
> Michał