linux-kernel - Re: [PATCH 1/4] usbnet: smsc95xx: add kconfig for turbo mode

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Message-ID: <20181002124618.GD9155@lunn.ch>
Date:   Tue, 2 Oct 2018 14:46:18 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:     netdev@...r.kernel.org, oneukum@...e.com, davem@...emloft.net,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel@...ts.codethink.co.uk
Subject: Re: [PATCH 1/4] usbnet: smsc95xx: add kconfig for turbo mode

On Tue, Oct 02, 2018 at 10:26:42AM +0100, Ben Dooks wrote:
> Add a configuration option for the default state of turbo mode
> on the smsc95xx networking driver. Some systems it is better
> to default this to off as it causes significant increases in
> soft-irq load.
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
> ---
>  drivers/net/usb/Kconfig    | 9 +++++++++
>  drivers/net/usb/smsc95xx.c | 2 +-
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/usb/Kconfig b/drivers/net/usb/Kconfig
> index 418b0904cecb..a32f1a446ce9 100644
> --- a/drivers/net/usb/Kconfig
> +++ b/drivers/net/usb/Kconfig
> @@ -351,6 +351,15 @@ config USB_NET_SMSC95XX
>  	  This option adds support for SMSC LAN95XX based USB 2.0
>  	  10/100 Ethernet adapters.
>  
> +config USB_NET_SMSC95XX_TURBO
> +	bool "Use turbo receive mode by default"
> +	depends on USB_NET_SMSC95XX
> +	default y
> +	help
> +	  This options sets the default turbo mode settings for the
> +	  driver's receive path. These can also be altered by the
> +	  turbo_mode module parameter.
> +

Hi Ben

Is it worth adding a comment here why you would want to turn it off?
To reduce soft-irq load?

Thanks
	Andrew