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 for ath10k@lists.infradead.org; Sun, 25 May 2014 07:33:19 +0000
From: Kalle Valo <kvalo@qca.qualcomm.com>
Subject: Re: help troubleshooting low throughput
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Date: Sun, 25 May 2014 10:32:52 +0300
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 (Tim Harvey's message of "Fri, 23 May 2014 22:32:59 -0700")
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To: Tim Harvey <tharvey@gateworks.com>
Cc: Michal Kazior <michal.kazior@tieto.com>, "ath10k@lists.infradead.org" <ath10k@lists.infradead.org>

Tim Harvey <tharvey@gateworks.com> writes:

>> Also, now that I think about you don't have a bridge. This means your
>> AP system has to perform a lot more packet mangling which I guess can
>> be pretty taxing for the A9.
>>
>
> yep - turns out it is a cpu bottleneck. I'm not sure what I was
> looking at when I checked the performance before but now I see that I
> am hitting 100% utilization.
>
> Putting the AP in a bridge and moving iperf off of it, brings up my
> TCP bandwidth to 240mbps (at which point the STA running iperf is 100%
> pegged) and 463mbps UDP (at which point the AP was 100% pegged).

Did you check that you had all kernel debug options disabled, including
ath10k debug options? Kernel debugging code can significantly decrease
maximum throughput.

-- 
Kalle Valo

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