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Mail Archives: cygwin-developers/2002/07/29/15:52:14

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Message-ID: <3D459CEC.35B29D99@ieee.org>
Date: Mon, 29 Jul 2002 15:52:12 -0400
From: "Pierre A. Humblet" <Pierre DOT Humblet AT ieee DOT org>
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To: Conrad Scott <Conrad DOT Scott AT dsl DOT pipex DOT com>
CC: cygwin-developers AT cygwin DOT com
Subject: Re: TCP problems
References: <010901c23724$96e5d430$6132bc3e AT BABEL> <3D4581E4 DOT BB580995 AT ieee DOT org> <005801c23730$02304170$6132bc3e AT BABEL> <3D459257 DOT 240C79DC AT ieee DOT org> <009c01c23736$4a61a4b0$6132bc3e AT BABEL>

Conrad Scott wrote:

> > > It's a really simple server: blocking accept,
> > > read/write on the new file descriptor, then shutdown/close it
> and
> > > back to a blocking accept.  And it still hits the WASENOBUFS
> wall
> > > eventually (altho' it can be delayed by registry patches to
> > > increase various TCP parameters).
> >
> > How long/how many accepts (more or less) is "eventually".
> 
> On my lovely little win98/SE box: one hundred connections minus a
> few.

On my Win98 the exim mail server accepts hundreds of connections
(over hours, days and weeks) without problems....
One hundred is about the default max # simultaneous tcp connections.
Does netstat -an show them, e.g. in TIME_WAIT?
If they happen in a short time (minutes) you may be hitting the
default linger timeout. Have you tried setting linger ON with a 0
timeout?

> Nicholas Wourms (my (un)willing test accomplice) reported "~3
> minutes" of run time before hitting the same error: so he's
> getting a thousand or so (?) connections by the sounds of it.

Win98 or ME? If it's ME that reminds of the Xserver problem
we had a year ago.

Pierre

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