linux-kernel - Re: [PATCH v2 net-next 1/4] net: implement support for low latency socket polling

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Message-ID: <20130520162227.GD24555@two.firstfloor.org>
Date:	Mon, 20 May 2013 18:22:27 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
Cc:	Dave Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Don Skidmore <donanld.c.skidmore@...el.com>,
	e1000-devel@...ts.sourceforge.net,
	Willem de Bruijn <willemb@...gle.com>,
	Andi Kleen <andi@...stfloor.org>, HPA <hpa@...or.com>,
	Eliezer Tamir <eliezer@...ir.org.il>
Subject: Re: [PATCH v2 net-next 1/4] net: implement support for low latency
 socket polling

> diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
> index f98ca63..cfcf0ea 100644
> --- a/Documentation/networking/ip-sysctl.txt
> +++ b/Documentation/networking/ip-sysctl.txt
> @@ -19,6 +19,11 @@ ip_no_pmtu_disc - BOOLEAN
>  	Disable Path MTU Discovery.
>  	default FALSE
>  
> +ip_low_latency_poll - INTEGER
> +	Low latency busy poll timeout. (needs CONFIG_INET_LL_RX_POLL)
> +	Approximate time in ms to spin waiting for packets on the device queue.
> +	default 0

Can you document the suggested value here?

Also I would add something like "may increase power usage"

The other thing I would add is a linuxmib statistic counter so that
we can see the polling happens.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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