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

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Message-ID: <412e6f7f0911131542w1029893cmd07599660b810ed5@mail.gmail.com>
Date:	Sat, 14 Nov 2009 07:42:12 +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 7:32 AM, Stephen Hemminger
<shemminger@...tta.com> wrote:
> On Sat, 14 Nov 2009 07:28:42 +0800
> Changli Gao <xiaosuo@...il.com> wrote:
>
>> On Sat, Nov 14, 2009 at 12:15 AM, Stephen Hemminger
>>
>> It needs to send remote SoftIRQ, as Receiving Packet Steering, and we
>> must support a extra interface to map load to CPUs.
>>
>
> But it still could use NAPI to avoid causing excess packet overhead.
> The softirq could be equivalent of hardirq in network device.
>

Yea, the overhead of SoftIRQ is less than kernel threads, and I'll try
to find a way to solve both flexibility and efficiency. Maybe I need
some real NIC drivers as examples. Is there a standard API to bind RQs
of NIC to CPUs, such as ioctl or setsockopt?


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