netdev - Re: [v2 PATCH] net: Update alloc frag to reduce get/put page usage and recycle pages

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Date:	Fri, 13 Jul 2012 02:59:40 -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, edumazet@...gle.com,
	alexander.duyck@...il.com
Subject: Re: [v2 PATCH] net: Update alloc frag to reduce get/put page usage
 and recycle pages

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 13 Jul 2012 11:06:34 +0200

> On Thu, 2012-07-12 at 17:23 -0700, Alexander Duyck wrote:
>> This patch is meant to help improve performance by reducing the number of
>> locked operations required to allocate a frag on x86 and other platforms.
>> This is accomplished by using atomic_set operations on the page count
>> instead of calling get_page and put_page.  It is based on work originally
>> provided by Eric Dumazet.
>> 
>> In addition it also helps to reduce memory overhead when using TCP.  This
>> is done by recycling the page if the only holder of the frame is the
>> netdev_alloc_frag call itself.  This can occur when skb heads are stolen by
>> either GRO or TCP and the driver providing the packets is using paged frags
>> to store all of the data for the packets.
>> 
>> Cc: Eric Dumazet <edumazet@...gle.com>
>> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
 ...
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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