linux-kernel - Re: [PATCH 1/3] Kernel interfaces for multiqueue aware socket

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Date:	Thu, 16 Dec 2010 09:28:15 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Fenghua Yu <fenghua.yu@...el.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Fastabend, John R" <john.r.fastabend@...el.com>,
	"Tang, Xinan" <xinan.tang@...el.com>,
	Junchang Wang <junchangwang@...il.com>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] Kernel interfaces for multiqueue aware socket

On Thu, Dec 16, 2010 at 9:14 AM, Fenghua Yu <fenghua.yu@...el.com> wrote:
>
> SKF_AD_QUEUE doesn't know number of rx queues. Thus user application can't
> specify right SKF_AD_QUEUE.

It is wrong. AFAIK, you can get the queue number through
/sys/class/net/eth*/queues/ or /proc/interrupts


>
> SKF_AD_QUEUE only works for rx. There is no queue bound interfaces for tx.

Do you really need queue number? The packets must be already spreaded
among CPUs, I think you means the current CPU number. Please see
SKF_AD_CPU added by Eric.

>
> I can change the patch set to use SKF_AD_QUEUE by removing the set rx queue
> interface and still keep interfaces of
> #define SIOGNUMRXQUEUE 0x8939  /* Get number of rx queues. */
> #define SIOGNUMTXQUEUE 0x893A  /* Get number of tx queues. */
> #define SIOSTXQUEUEMAPPING     0x893C  /* Set tx queue mapping. */
> #define SIOGRXQUEUEMAPPING     0x893D  /* Get rx queue mapping. */
> #define SIOGTXQUEUEMAPPING     0x893E  /* Get tx queue mapping. */
>
>>
>> Also your AF_PACKET patch only address mmaped sockets.
>>
> The new patch set will use SKF_AD_QUEUE for rx. So it won't be limited to mmaped
> sockets.
>

If you turn to SKF_AD_QUEUE, I think no patch for kernel is needed.


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