netdev - Re: PROBLEM: Linux kernel 2.6.31 IPv4 TCP fails to open huge amount of outgoing connections (unable to bind ... )

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Message-ID: <20100421182723.GA17202@ioremap.net>
Date:	Wed, 21 Apr 2010 22:27:23 +0400
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ben Greear <greearb@...delatech.com>,
	David Miller <davem@...emloft.net>,
	Gaspar Chilingarov <gasparch@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: PROBLEM: Linux kernel 2.6.31 IPv4 TCP fails to open huge amount of outgoing connections (unable to bind ... )

On Wed, Apr 21, 2010 at 01:27:33PM +0200, Eric Dumazet (eric.dumazet@...il.com) wrote:
> Here is the patch I use now and my test application is now able to open
> and connect 1000000 sockets (ulimit -n 1000000)
> 
> Trick is bind_conflict() must refuse a socket to bind to a port on a non
> null IP if another socket already uses same port on same IP.
> 
> Plus the previous patch sent (check a conflict before exiting the search
> loop)
> 
> What do you think ?

Looks good, but do we want to check only reused socket's address there?
What if one of the sockets does not have reuse option turned on, will it
break?

-- 
	Evgeniy Polyakov
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