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: <x2s46c8cb3e1004201620k1112add9pd1c326205be4d625@mail.gmail.com>
Date:	Wed, 21 Apr 2010 04:20:11 +0500
From:	Gaspar Chilingarov <gasparch@...il.com>
To:	Ben Greear <greearb@...delatech.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 ... )

Opening that amount of incoming connections in not a problem at all.

I'm speaking of outgoing connections.

What kind of hack do you have on your kernel?

Thanks in advance,
Gaspar

2010/4/21 Ben Greear <greearb@...delatech.com>:
> 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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