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

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Message-Id: <20120711.181108.265166900708992139.davem@davemloft.net>
Date:	Wed, 11 Jul 2012 18:11:08 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	alexander.h.duyck@...el.com, netdev@...r.kernel.org,
	jeffrey.t.kirsher@...el.com, alexander.duyck@...il.com,
	edumazet@...gle.com
Subject: Re: [PATCH 2/2] net: Update alloc frag to reduce get/put page
 usage and recycle pages

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 12 Jul 2012 02:29:27 +0200

> 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)

I'd like you two to sort things out before I apply anything, thanks :)
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