netdev - Re: [PATCH] socket: increase default maximum listen queue length

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Message-ID: <20110320113921.GA3038@nuttenaction>
Date:	Sun, 20 Mar 2011 12:39:21 +0100
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] socket: increase default maximum listen queue length

* Eric Dumazet | 2011-03-20 09:30:17 [+0100]:

>Hmm, real problem is not the 'maximum queue value', but the minimum one.
>
>If application says : listen(fd, 10), you are stuck.
>
>128 or 256 is way too small on some servers, where admin can tune
>in /etc/sysctl.conf :
>
>net.core.somaxconn = 8192
>net.ipv4.tcp_max_syn_backlog = 8192
>
>But application also needs to use : listen(fd, 8192)

I know Eric, I wrote the patch. ;-) The used naming goes like this:

The system limits (somaxconn & tcp_max_syn_backlog) specify a _maximum_, the
user cannot exceed this limit with listen(2). The backlog argument for listen
on the other hand specify a _minimum_. But the patch increased the default
maximum, therefore I named it in this way.
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