linux-kernel - Re: [PATCH net-next v2] net: ti: icssg_prueth: Add SW TX / RX Coalescing based on hrtimers

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Message-ID: <e061956a-59e6-435e-99fe-6c6c7b2d6a5d@lunn.ch>
Date: Mon, 29 Apr 2024 14:50:00 +0200
From: Andrew Lunn <andrew@...n.ch>
To: MD Danish Anwar <danishanwar@...com>
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	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 v2] net: ti: icssg_prueth: Add SW TX / RX
 Coalescing based on hrtimers

On Mon, Apr 29, 2024 at 12:45:01PM +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 coalesing 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>

    Andrew