netdev - Re: [PATCH 2/2] net: Update alloc frag to reduce get/put page usage and recycle pages

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Date:	Thu, 12 Jul 2012 02:29:27 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	jeffrey.t.kirsher@...el.com, alexander.duyck@...il.com,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH 2/2] net: Update alloc frag to reduce get/put page
 usage and recycle pages

On Wed, 2012-07-11 at 17:18 -0700, Alexander Duyck wrote:
> This patch does several things.
> 
> First it reorders the netdev_alloc_frag code so that only one conditional
> check is needed in most cases instead of 2.
> 
> Second it incorporates the atomic_set and atomic_sub_return logic from an
> earlier proposed patch by Eric Dumazet allowing for a reduction in the
> get_page/put_page overhead when dealing with frags.
> 
> Finally it also incorporates the page reuse code so that if the page count
> is dropped to 0 we can just reinitialize the page and reuse it.
> 
> Cc: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> ---


Hmm, I was working on a version using order-3 pages if available.

(or more exactly 32768 bytes chunks)

I am not sure how your version can help with typical 1500 allocations
(2 skbs per page)


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