netdev - Re: [PATCH] sky2: skb recycling

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Message-ID: <48FDCC3B.6020806@baidu.com>
Date:	Tue, 21 Oct 2008 20:34:03 +0800
From:	Terry <hanfang@...du.com>
To:	Robert Olsson <robert@...ur.slu.se>
CC:	Robert Olsson <Robert.Olsson@...a.slu.se>,
	Eric Dumazet <dada1@...mosbay.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Jeff Garzik <jgarzik@...ox.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: skb recycling



Robert Olsson wrote:
> Terry writes:
>  > Hi 
>  >     yeah. In the forwarding scenario , skb recycling should boost the 
>  > performance by avoiding slowpath slub alloc/free .But if  using 
>  > multiqueue hardware and assigning proper  cpu affinities  could  make it 
>  > always in the fastpath of slub  alloc/free, which is faster?
>
>  For perfect setup with monotone work like forwarding you can make the skb 
>  recycling a little faster.
>
>  If you have many active NIC's and the recycling list is per device the situation
>  it's probably different...
>
>  Cheers.
> 						--ro
>   

Yeah,it's different. So I am considering X-NICs  skb recycling like the 
"global" recycler you mentioned.It may help. But it may introduce some 
race-conditions too.

Rgds.

Terry

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