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: <4BCE33B9.8050101@candelatech.com>
Date:	Tue, 20 Apr 2010 16:07:37 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Gaspar Chilingarov <gasparch@...il.com>
CC:	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 04/20/2010 03:17 PM, Gaspar Chilingarov wrote:

> I would be grateful for hints where to look in the source -- may be I
> can produce some working patches for it.

I've opened 40,000 connections to/from my machine (over external interfaces)
on a slightly hacked .31 kernel.  This is 80,000 sockets total.  I bind
to local IP and port range, as well as SO_BINDTODEVICE.

I'm using a 64-bit system with 12GB of RAM, quad-core i7 3.3Ghz, etc.

It takes a lot of RAM to do this but you can probably use less RAM in user-space
than I am.  Be sure to set your socket buffer sizes small.

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com
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