linux-kernel - Re: [net-next RFC v3 5/7] net: ravb: Enable SW IRQ Coalescing for GbEth

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Date: Fri, 19 Apr 2024 23:26:05 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: Paul Barker <paul.barker.ct@...renesas.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>,
	Geert Uytterhoeven <geert+renesas@...der.be>, <netdev@...r.kernel.org>,
	<linux-renesas-soc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [net-next RFC v3 5/7] net: ravb: Enable SW IRQ Coalescing for
 GbEth

On 4/15/24 12:48 PM, Paul Barker wrote:

> Software IRQ Coalescing is required to improve network stack performance
> in the RZ/G2L SoC family and the RZ/G3S SoC, i.e. the SoCs which use the
> GbEth IP.
> 
> This patch gives the following improvements during testing with iperf3:
> 
>   * RZ/G2L:
>     * TCP RX: same bandwidth with -6% CPU load (76% -> 71%)
>     * UDP RX: same bandwidth with -10% CPU load (99% -> 89%)
> 
>   * RZ/G2UL:
>     * UDP RX: +4200% bandwidth (1.23Mbps -> 53Mbps)
> 
>   * RZ/G3S:
>     * UDP RX: +425% bandwidth (1.23Mbps -> 6.46Mbps)
> 
> The improvement of UDP RX bandwidth for the single core SoCs (RZ/G2UL &
> RZ/G3S) is particularly critical.
> 
> Signed-off-by: Paul Barker <paul.barker.ct@...renesas.com>

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

[...]

> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
> index 71de2a7aa27c..9c6392ade2f1 100644
> --- a/drivers/net/ethernet/renesas/ravb.h
> +++ b/drivers/net/ethernet/renesas/ravb.h
> @@ -1054,6 +1054,7 @@ struct ravb_hw_info {
>  	u32 rx_max_desc_use;
>  	u32 rx_desc_size;
>  	unsigned aligned_tx: 1;
> +	unsigned needs_irq_coalesce:1;	/* Needs software IRQ coalescing */

   Perhaps something shorter, like coalesce_irqs?

[...]

MBR, Sergey