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Re: Cygwin PostgreSQL Regression Test Problems (Revisited)

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Jason(dot)Tishler(at)dothill(dot)com, Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp>, pgsql-ports(at)postgresql(dot)org
Subject: Re: Cygwin PostgreSQL Regression Test Problems (Revisited)
Date: 2001-04-02 22:01:48
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-ports
> I wrote:
> > I still suspect there's something else going on here, anyway.  SOMAXCONN
> > is nominally 5 on quite a lot of Unixen, but we've only heard reports of
> > transient "make check" connect failures on Windows.  Why is Windows so
> > much more prone to show this problem?
> Hm, maybe I need to take this back.  Some poking around shows that
> SOMAXCONN is defined as 128 on Linux, 20 on HPUX, which are the
> platforms I've tested most.  As an experiment I reduced the listen()
> parameter to 5 on HPUX, and bingo: I get connection-refused failures
> in "make check".  So it seems that Windows' behavior is not so out of
> line after all.  We would probably see similar failures on BSD-derived
> systems, since BSD systems traditionally set SOMAXCONN to 5.  (Any
> BSD partisans able to check this?)

BSDi 4.01 has:

	 * Maximum queue length specifiable by listen.
	 * The kernel has a configurable limit;
	 * the non-kernel value is the traditional one.
	#ifndef KERNEL
	#define SOMAXCONN   64  /* XXX, really run-time settable */
	#ifndef _POSIX_SOURCE
	#define SOMAXCONN_DFLT  64

and sysctl has:

	net.socket.maxconn = 64

that can be easily changed.

  Bruce Momjian                        |
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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