linux-kernel - Re: [PATCH net-next v3] net: ti: icssg_prueth: Add SW TX / RX Coalescing based on hrtimers

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Date: Tue, 30 Apr 2024 20:49:38 +0100
From: Simon Horman <horms@...nel.org>
To: MD Danish Anwar <danishanwar@...com>
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Andrew Lunn <andrew@...n.ch>, Jan Kiszka <jan.kiszka@...mens.com>,
	Diogo Ivo <diogo.ivo@...mens.com>, Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, srk@...com,
	Vignesh Raghavendra <vigneshr@...com>, r-gunasekaran@...com,
	Roger Quadros <rogerq@...nel.org>
Subject: Re: [PATCH net-next v3] net: ti: icssg_prueth: Add SW TX / RX
 Coalescing based on hrtimers

On Tue, Apr 30, 2024 at 05:36:34PM +0530, MD Danish Anwar wrote:
> Add SW IRQ coalescing based on hrtimers for RX and TX data path for ICSSG
> driver, which can be enabled by ethtool commands:
> 
> - RX coalescing
>   ethtool -C eth1 rx-usecs 50
> 
> - TX coalescing can be enabled per TX queue
> 
>   - by default enables coalescing for TX0
>   ethtool -C eth1 tx-usecs 50
>   - configure TX0
>   ethtool -Q eth0 queue_mask 1 --coalesce tx-usecs 100
>   - configure TX1
>   ethtool -Q eth0 queue_mask 2 --coalesce tx-usecs 100
>   - configure TX0 and TX1
>   ethtool -Q eth0 queue_mask 3 --coalesce tx-usecs 100 --coalesce
> tx-usecs 100
> 
> Minimum value for both rx-usecs and tx-usecs is 20us.
> 
> Compared to gro_flush_timeout and napi_defer_hard_irqs this patch allows
> to enable IRQ coalescing for RX path separately.
> 
> Benchmarking numbers:
>  ===============================================================
> | Method                  | Tput_TX | CPU_TX | Tput_RX | CPU_RX |
> | ==============================================================
> | Default Driver           943 Mbps    31%      517 Mbps  38%   |
> | IRQ Coalescing (Patch)   943 Mbps    28%      518 Mbps  25%   |
>  ===============================================================
> 
> Signed-off-by: MD Danish Anwar <danishanwar@...com>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> ---
> Changes from v2 [2] to v3:
> *) Collected RB tag from Andrew Lunn <andrew@...n.ch>
> *) Fixed warning caused by {} missing for outer if conditions in
>    emac_napi_tx_poll() and emac_napi_rx_poll() APIs.
> *) Fixed spelling mistake.

Thanks for the updates.
This one looks good to me.

Reviewed-by: Simon Horman <horms@...nel.org>

> 
> Changes from v1 [1] to v2:
> *) Added Benchmarking numbers in the commit message as suggested by
>    Andrew Lunn <andrew@...n.ch>. Full logs [3]
> *) Addressed comments given by Simon Horman <horms@...nel.org> in v1.
> 
> [1] https://lore.kernel.org/all/20240424091823.1814136-1-danishanwar@ti.com/
> [2] https://lore.kernel.org/all/20240429071501.547680-1-danishanwar@ti.com/
> [3] https://gist.githubusercontent.com/danish-ti/47855631be9f3635cee994693662a988/raw/94b4eb86b42fe243ab03186a88a314e0cb272fd0/gistfile1.txt

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