netdev - Re: [PATCH v2] ath10k: snoc: enable threaded napi on WCN3990

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Date:   Wed, 22 Feb 2023 09:57:40 +0000 (UTC)
From:   Kalle Valo <kvalo@...nel.org>
To:     Abhishek Kumar <kuabhs@...omium.org>
Cc:     kuabhs@...omium.org, davem@...emloft.net,
        ath10k@...ts.infradead.org, quic_mpubbise@...cinc.com,
        netdev@...r.kernel.org, kuba@...nel.org,
        linux-wireless@...r.kernel.org, pabeni@...hat.com,
        linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v2] ath10k: snoc: enable threaded napi on WCN3990

Abhishek Kumar <kuabhs@...omium.org> wrote:

> NAPI poll can be done in threaded context along with soft irq
> context. Threaded context can be scheduled efficiently, thus
> creating less of bottleneck during Rx processing. This patch is
> to enable threaded NAPI on ath10k driver.
> 
> Based on testing, it was observed that on WCN3990, the CPU0 reaches
> 100% utilization when napi runs in softirq context. At the same
> time the other CPUs are at low consumption percentage. This
> does not allow device to reach its maximum throughput potential.
> After enabling threaded napi, CPU load is balanced across all CPUs
> and following improvments were observed:
> - UDP_RX increase by ~22-25%
> - TCP_RX increase by ~15%
> 
> Here are some of the additional raw data with and without threaded napi:
> ==================================================
> udp_rx(Without threaded NAPI)
> 435.98+-5.16 : Channel 44
> 439.06+-0.66 : Channel 157
> 
> udp_rx(With threaded NAPI)
> 509.73+-41.03 : Channel 44
> 549.97+-7.62 : Channel 157
> ===================================================
> udp_tx(Without threaded NAPI)
> 461.31+-0.69  : Channel 44
> 461.46+-0.78 : Channel 157
> 
> udp_tx(With threaded NAPI)
> 459.20+-0.77 : Channel 44
> 459.78+-1.08 : Channel 157
> ===================================================
> tcp_rx(Without threaded NAPI)
> 472.63+-2.35 : Channel 44
> 469.29+-6.31 : Channel 157
> 
> tcp_rx(With threaded NAPI)
> 498.49+-2.44 : Channel 44
> 541.14+-40.65 : Channel 157
> ===================================================
> tcp_tx(Without threaded NAPI)
> 317.34+-2.37 : Channel 44
> 317.01+-2.56 : Channel 157
> 
> tcp_tx(With threaded NAPI)
> 371.34+-2.36 : Channel 44
> 376.95+-9.40 : Channel 157
> ===================================================
> 
> Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.2.2-00696-QCAHLSWMTPL-1
> Signed-off-by: Abhishek Kumar <kuabhs@...omium.org>
> Signed-off-by: Kalle Valo <quic_kvalo@...cinc.com>

Patch applied to ath-next branch of ath.git, thanks.

8c68fe00344c wifi: ath10k: snoc: enable threaded napi on WCN3990

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20230203000116.v2.1.I5bb9c164a2d2025655dee810b983e01ecd81c14e@changeid/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches