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 for ath10k@lists.infradead.org; Fri, 02 Sep 2016 16:30:55 +0000
From: "Valo, Kalle" <kvalo@qca.qualcomm.com>
Subject: Re: ath10k: fix throughput regression in multi client mode
Date: Fri, 2 Sep 2016 16:30:26 +0000
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 (Kalle Valo's message of "Wed, 31 Aug 2016 10:24:15 +0200")
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To: "Manoharan, Rajkumar" <rmanohar@qti.qualcomm.com>
Cc: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>, "rmanohar@codeaurora.org" <rmanohar@codeaurora.org>, "ath10k@lists.infradead.org" <ath10k@lists.infradead.org>

Kalle Valo <kvalo@qca.qualcomm.com> writes:

> Rajkumar Manoharan <rmanohar@qti.qualcomm.com> wrote:
>> commit 7a0adc83f34d ("ath10k: improve tx scheduling") is causing
>> severe throughput drop in multi client mode. This issue is originally
>> reported in veriwave setup with 50 clients with TCP downlink traffic.
>> While increasing number of clients, the average throughput drops
>> gradually. With 50 clients, the combined peak throughput is decreased
>> to 98 Mbps whereas reverting given commit restored it to 550 Mbps.
>> 
>> Processing txqs for every tx completion is causing overhead. Ideally for
>> management frame tx completion, pending txqs processing can be avoided.
>> The change partly reverts the commit "ath10k: improve tx scheduling".
>> Processing pending txqs after all skbs tx completion will yeild enough
>> room to burst tx frames.
>> 
>> Fixes: 7a0adc83f34d ("ath10k: improve tx scheduling")
>> Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
>
> I'm planning to queue this to 4.8 if no objections.

Actually the patch doesn't apply to ath-current branch so I'll apply to
ath-next instead.

-- 
Kalle Valo
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