netdev - Re: [PATCH] Add a network activity LED trigger

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Date:	Wed, 18 Jul 2007 14:41:22 +0100
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Florian Fainelli <florian.fainelli@...ecomint.eu>
Cc:	netdev@...r.kernel.org, rpurdie@...ys.net
Subject: Re: [PATCH] Add a network activity LED trigger

On Wed, 18 Jul 2007 15:27:38 +0200
Florian Fainelli <florian.fainelli@...ecomint.eu> wrote:

> Hi all,
> 
> This patch adds a new LED trigger, based on network activity. It gathers 
> activity from net/core/dev.c and can be used as a LED trigger by 
> specifying "network-activity". Further version should allow the user to 
> specify the network interface to bind a LED to. This trigger is a "simple" 
> trigger as defined by the LED subsystem.
> 
> Signed-off-by: Florian Fainelli <florian.fainelli@...ecomint.eu>
> -- 

You are slowing down the network receive path even if LED is not used.

Doing mod_timer() is expensive, on a busy system you would be adding
another lock roundtrip and list operation for each incoming packet.
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