netdev - Re: [PATCH v2] ipv6: Don't depend on per socket memory for neighbour discovery messages

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Date:	Tue, 3 Sep 2013 09:18:35 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Stephen Warren <swarren@...dotorg.org>
Subject: Re: [PATCH v2] ipv6: Don't depend on per socket memory for neighbour
 discovery messages

On Tue, Sep 3, 2013 at 8:37 AM, Thomas Graf <tgraf@...g.ch> wrote:
> Allocating skbs when sending out neighbour discovery messages
> currently uses sock_alloc_send_skb() based on a per net namespace
> socket and thus share a socket wmem buffer space.
>
> If a netdevice is temporarily unable to transmit due to carrier
> loss or for other reasons, the queued up ndisc messages will cosnume
> all of the wmem space and will thus prevent from any more skbs to
> be allocated even for netdevices that are able to transmit packets.
>
> The number of neighbour discovery messages sent is very limited,
> use of alloc_skb() bypasses the socket wmem buffer size enforcement
> while the manual call to skb_set_owner_w() maintains the socket
> reference needed for the IPv6 output path.
>
> This patch has orginally been posted by Eric Dumazet in a modified
> form.
>
> Signed-off-by: Thomas Graf <tgraf@...g.ch>
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Cc: Stephen Warren <swarren@...dotorg.org>
> Cc: Fabio Estevam <festevam@...il.com>

I don't get the system hang that I used to see with the previous
version on my ARM board, so

Tested-by: Fabio Estevam <fabio.estevam@...escale.com>
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