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

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Date:	Sat, 14 Nov 2009 21:30:52 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Jarek Poplawski <jarkao2@...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 8:53 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Changli Gao a écrit :
>> 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?
>
> Thats a good question... napi is bound to a cpu, and you'll need
> things that were done by Tom Herbert in its RPS patch, to
> be able to deleguate work to remote cpus napi contexts.
>
> But if we consider RPS being close to be committed, shouldnt
> IFB use its, in order to not duplicate changes ?
>
> Or, if you prefer, once RPS is in, we dont need to change IFB, since
> RPS will already split the load to multiple cpus before entering IFB.
>
>

I had known RPS before I began my IFB work, so I added Tom to the CC
list, but I don't know if RPS will be in the mainline. Since there
isn't any core change in IFB as is in RPS, I think it is easier to
merge IFB into the mainline. If RPS is merged before IFB-MQ, I'll give
IFB-MQ up, and vice versa I think.

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