netdev - Re: [PATCH net-next] netlink: autosize skb lengthes

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Message-ID: <20140310094123.GA2396@casper.infradead.org>
Date:	Mon, 10 Mar 2014 09:41:23 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] netlink: autosize skb lengthes

On 03/07/14 at 12:02pm, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> One known problem with netlink is the fact that NLMSG_GOODSIZE is
> really small on PAGE_SIZE==4096 architectures, and it is difficult
> to know in advance what buffer size is used by the application.
> 
> This patch adds an automatic learning of the size.
> 
> First netlink message will still be limited to ~4K, but if user used
> bigger buffers, then following messages will be able to use up to 16KB.
> 
> This speedups dump() operations by a large factor and should be safe
> for legacy applications.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Thomas Graf <tgraf@...g.ch>
> Google-Bug-Id: 13305844

Acked-by: Thomas Graf <tgraf@...g.ch>
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