netdev - Re: pre-fetching skb for delayed send

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Date:	Fri, 06 Jul 2012 21:15:29 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Benjamin LaHaise <bcrl@...ck.org>
CC:	netdev <netdev@...r.kernel.org>
Subject: Re: pre-fetching skb for delayed send

On 07/06/2012 04:52 PM, Benjamin LaHaise wrote:
> On Fri, Jul 06, 2012 at 04:10:40PM -0700, Ben Greear wrote:
>> So, is there an easy way to pre-fetch an skb and it's related pages?
>
> One trick would be to store the pointers to the skbs in an array rather than
> relying on a list of skbs.  That would enable you to issue prefetches for
> multiple skbs from a single cache line of the array, rather than relying
> upon the slow chasing of pointers guaranteed to cache miss in a list.

Well, to start with..I at least know the next skb to transmit,
so I figured I'd prefetch it before starting tx of the current
skb.

My question is more basic though:  Given an skb, how do you prefetch
it...do you just prefetch the skb pointer, or do you need to dig into
the guts of the skb?

Thanks,
Ben

>
> 		-ben
>


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com


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