linux-kernel - Re: [PATCH 1/2] NET: Multiple queue network device support

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Date:	Fri, 23 Feb 2007 11:19:11 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	"Sreenivasa Honnur" <Sreenivasa.Honnur@...erion.com>
Cc:	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	"David Miller" <davem@...emloft.net>,
	"Garzik, Jeff" <jgarzik@...ox.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	"Peter Waskiewicz Jr" <peter.p.waskiewicz.jr@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Kok, Auke" <auke@...-projects.org>,
	"Ronciak, John" <john.ronciak@...el.com>
Subject: Re: [PATCH 1/2] NET: Multiple queue network device support

On Fri, 23 Feb 2007 04:00:55 -0500
"Sreenivasa Honnur" <Sreenivasa.Honnur@...erion.com> wrote:

> Fucntion "map_queue" returns queue index as '0'. There is no support to
> return different queue indexes.
> 
> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
> On Behalf Of Kok, Auke
> Sent: Friday, February 09, 2007 5:40 AM
> To: David Miller; Garzik, Jeff; netdev@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Cc: Kok, Auke; Peter Waskiewicz Jr; Brandeburg, Jesse; Kok, Auke;
> Ronciak, John
> Subject: [PATCH 1/2] NET: Multiple queue network device support
> 
> 
> From: Peter Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
> 
> Added an API and associated supporting routines for multiqueue network
> devices.  This allows network devices supporting multiple TX queues to
> configure each queue within the netdevice and manage each queue
> independantly.  Changes to the PRIO Qdisc also allow a user to map
> multiple flows to individual TX queues, taking advantage of each queue
> on the device.
> 
> Signed-off-by: Peter Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
> Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
> ---

>  
> +config NET_MULTI_QUEUE_DEVICE
> +	bool "Multiple queue network device support (EXPERIMENTAL)"
> +	depends on NET_SCHED && EXPERIMENTAL
> +	help
> +	  Saying Y here will add support for network devices that have
> more than
> +	  one physical TX queue and/or RX queue.
> +
> +	  Multiple queue devices will require qdiscs that understand how
> to
> +	  queue to multiple targets.  The default packet scheduler will
> default
> +	  to the first queue in a device.  In other words, if you need
> the
> +	  ability to spread traffic across queues, your queueing
> discipline
> +	  needs to know how to do that.
> +
> +	  Note that saying Y here will give preferential treatment to
> multiple
> +	  queue devices in the network stack.  A slight drop in
> single-queue
> +	  device performance may be seen.
> +
> +	  Say N here unless you know your network device supports
> multiple
> +	  TX and/or RX queues.
> +

This should not be a user visible configuration option.
It should either: always be part of the kernel API
or be selected by drivers that need/want it.

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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