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

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Message-ID: <1300613784.2831.142.camel@edumazet-laptop>
Date:	Sun, 20 Mar 2011 10:36:24 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rémi Denis-Courmont <remi@...lab.net>
Cc:	Hagen Paul Pfeifer <hagen@...u.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] socket: increase default maximum listen queue length

Le dimanche 20 mars 2011 à 11:04 +0200, Rémi Denis-Courmont a écrit :
> Le dimanche 20 mars 2011 10:30:17 Eric Dumazet, vous avez écrit :
> > 
> > But application also needs to use : listen(fd, 8192)
> 
> Application should pass INT_MAX anyway, unless it has a specific limit, e.g. 
> it can only handle one connection at time.
> 

You'll be surprised how few of them do that actually

ss -a | head
State      Recv-Q Send-Q      Local Address:Port          Peer Address:Port   
LISTEN     0      8                       *:imaps                    *:*       
LISTEN     0      8                       *:pop3s                    *:*       
LISTEN     0      50                      *:mysql                    *:*       
LISTEN     0      8                       *:pop3                     *:*       
LISTEN     0      8                       *:imap2                    *:*       
LISTEN     0      511                     *:www                      *:*       


Yes, Apache itself uses 511 as its default listenbacklog

You'll need to change 

ListenBacklog 8192



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