netdev - Re: [PATCH] net: introduce alloc_skb

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Message-Id: <20101016.115342.71098036.davem@davemloft.net>
Date:	Sat, 16 Oct 2010 11:53:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	sgruszka@...hat.com, romieu@...zoreil.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net: introduce alloc_skb_order0

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 11 Oct 2010 23:17:47 +0200

> [PATCH net-next] r8169: use 50% less ram for RX ring
> 
> Using standard skb allocations in r8169 leads to order-3 allocations (if
> PAGE_SIZE=4096), because NIC needs 16383 bytes, and skb overhead makes
> this bigger than 16384 -> 32768 bytes per "skb"
> 
> Using kmalloc() permits to reduce memory requirements of one r8169 nic
> by 4Mbytes. (256 frames * 16Kbytes). This is fine since a hardware bug
> requires us to copy incoming frames, so we build real skb when doing
> this copy.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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