netdev - Re: [PATCH] ifb: add multi-queue support

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Message-ID: <412e6f7f0911131528i3105648y49213143e12f2522@mail.gmail.com>
Date:	Sat, 14 Nov 2009 07:28:42 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>,
	Tom Herbert <therbert@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] ifb: add multi-queue support

On Sat, Nov 14, 2009 at 12:15 AM, Stephen Hemminger
<shemminger@...tta.com> wrote:
> On Fri, 13 Nov 2009 17:38:56 +0800
> Changli Gao <xiaosuo@...il.com> wrote:
>>
>> Oh, :) . I know more than one companies use kernel threads to forward
>> packets, and there isn't explicit extra overhead at all. And as you
>> know, as throughput increases, NAPI will bind the NIC to a CPU, and
>> softirqd will be waked up to do the work, which should be done in
>> SoftIRQ context. At that time, there isn't any difference between my
>> approach and the current kernel's.
>>
> Why not make IFB a NAPI device. This would get rid of the extra soft-irq
> round trip from going through netif_rx().  It would also behave like
> regular multi-queue recieive device, and eliminate need for seperate
> tasklets or threads.
>

It needs to send remote SoftIRQ, as Receiving Packet Steering, and we
must support a extra interface to map load to CPUs.

-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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