netdev - Re: [PATCH] net: Use NLMSG_DEFAULT_SIZE in combination with nlmsg

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Date:	Thu, 28 Jun 2012 16:55:49 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Jiri Pirko <jpirko@...hat.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Sergey Lapin <slapin@...fans.org>,
	Johannes Berg <johannes@...solutions.net>,
	Lauro Ramos Venancio <lauro.venancio@...nbossa.org>,
	Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH] net: Use NLMSG_DEFAULT_SIZE in combination with
 nlmsg_new()

On Thu, 2012-06-28 at 15:57 +0200, Thomas Graf wrote:
> Using NLMSG_GOODSIZE results in multiple pages being used as
> nlmsg_new() will automatically add the size of the netlink
> header to the payload thus exceeding the page limit.

On the other hand, this limits to 3776 bytes for each recvmsg() call.

Maybe this can add a regression if one of the file needed to store more
than 3776 bytes in the answer ?

For GFP_KERNEL allocations, I am not sure we really need to limit to
order-0 pages...

Unless you can point a real bug, this patch is not for net tree, but
net-next.



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