linux-kernel - Re: [PATCH 1/1] Per socket value for max datagram queue length

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Message-ID: <20140122152036.GB7269@order.stressinduktion.org>
Date:	Wed, 22 Jan 2014 16:20:36 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Dan Ballard <dan@...dstab.net>
Cc:	Lennart Poettering <lennart@...ttering.net>, kay.sievers@...y.org,
	Arnd Bergmann <arnd@...db.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	Neil Horman <nhorman@...driver.com>,
	Li Zefan <lizefan@...wei.com>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] Per socket value for max datagram queue length

On Wed, Jan 22, 2014 at 07:11:20AM -0800, Dan Ballard wrote:
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 5393b4b..1ff69d1 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -915,6 +915,10 @@ set_rcvbuf:
>                                          sk->sk_max_pacing_rate);
>                 break;
> 
> +       case SO_MAX_DGRAM_QLEN:
> +               sk->sk_max_ack_backlog = val;
> +               break;
> +

Shouldn't the backlog be capped for unprivileged users to some configurable
value? I even think that max_dgram_qlen should be the upper bound.

I guess it is not that serious as socket read accounting does account all
packets which sit in the backlog queue.

Greetings,

  Hannes

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