[erlang-questions] tcp_close during async accept

Valentin Micic <>
Wed Jul 8 14:41:04 CEST 2009


In my experience, a backlog value is rarely an issue in practice (although
testing may be another matter). What's more often a problem when you do
high-volume testing is number of file descriptors (e.g. maybe you did change
it in ERTS but not at kernel level, or vice-versa), or even value for
TIME_WAIT period etc. What makes you believe that the problem is with
backlog?
 
V.

-----Original Message-----
From:  [mailto:] On
Behalf Of Trevor Woollacott [ MTN - Innovation Centre ]
Sent: 08 July 2009 12:45 PM
To: Joel Reymont
Cc: 
Subject: RE: [erlang-questions] tcp_close during async accept

I'm not sure for Max OSX, but I think it is 128. Although that wouldn't
explain why only half of your 700 connections are successful. Maybe there is
a fudge factor involved in the calculation of the actual backlog value, or
maybe the listener process isn't accepting connections quickly enough?
I know for Windows Sockets 1.1 the maximum value is 5, and some versions of
Windows (such as Windows 2000 Server) allow a backlog value of up to 200.

> -----Original Message-----
> From: Joel Reymont [mailto:]
> Sent: Tuesday, 07 July 2009 04:31 PM
> To: Trevor Woollacott [ MTN - Innovation Centre ]
> Cc: Erlang Users' List
> Subject: Re: [erlang-questions] tcp_close during async accept
>
>
> On Jul 7, 2009, at 12:10 PM, Trevor Woollacott [ MTN - Innovation
> Centre ] wrote:
>
> > What OS are you using? Maybe the maximum backlog on your platform is
> > less than 1024?
>
>
> Mac OSX 10.5.7
>
> ---
> Mac hacker with a performance bent
> http://www.linkedin.com/in/joelreymont


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