Date: Fri, 29 Aug 2008 01:18:37 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Robert Watson" <rwatson@FreeBSD.org> Cc: freebsd-hackers@freebsd.org Subject: Re: lighttpd failing to accept new connections ( connection reset ) Message-ID: <78454DA58F8C48F8A31196BD2E407110@multiplay.co.uk> References: <A4FCC80B7CC742C393346F1FFE7AA18F@multiplay.co.uk> <alpine.BSF.1.10.0808282320200.92688@fledge.watson.org>
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----- Original Message -----
From: "Robert Watson" <rwatson@FreeBSD.org>
> The connections getting reset without application notification is a classic
> symptom of a full listen queue. A couple of questions:
Yep thats what I thought.
> (1) What FreeBSD version?
7.0-RELEASE-p2 (amd64)
> (2) Are you using accept filters?
The modules there but not loaded, so no.
> (3) If possibly, are you able to instrument lighthttpd so that you can trigger
> it to query SO_LISTENQLIMIT, SO_LISTENQLEN, and SO_LISTENINCQLEN on the
> listen socket once things have gone wrong? The respectively (and perhaps
> obviously) querye the current administrative limit on queue depth, the
> number queue depth on completed connections, and the current queue depth
> on incomplete connections. The last of these will only be used with
> accept filters on recent FreeBSD network stacks (since the syncache was
> added).
>
> Hopefully doing (3) will allow us to try to determine whether it's indeed the
> case that somehow the listen queue or event handling has gotten "wedged" in
> some way.
This should be possible, I'll have a look, assuming the kgdb stuff doesn't
turn up the required results.
Regards
Steve
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