From: Willy Tarreau <willy@w.ods.org>
To: Karthik Arumugham <kernel@karthik.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: New connections stall with 20k+ open sockets
Date: Mon, 29 Jul 2002 10:48:33 +0200 [thread overview]
Message-ID: <20020729084833.GA6841@alpha.home.local> (raw)
In-Reply-To: <Pine.LNX.4.44.0207281510550.9012-100000@neural.psychosis.net>
On Sun, Jul 28, 2002 at 03:37:47PM -0400, Karthik Arumugham wrote:
> I've been having an issue where when the server goes past 20k connections or
> so, it'll start ignoring syn packets on the most heavily used ports. I've
> experienced this under 2.4.18 and older 2.4 kernels, and I'm currently
> running 2.5.29. Distribution is Debian unstable (not that that should matter
> here). I'm using a Netgear GA620 gig-e card, x86 architecture.
I've had such a behaviour with an HTTP reverse proxy I wrote, until I
realized that when you have thousands of connections, the select() call
slows down a bit, and the accept() was not called often enough to catch
all the new connections. I simply solved the problem by calling as many
accept() as possible each time the listen socket wakes up. I'm pretty
sure you are in such a situation.
Cheers,
Willy
prev parent reply other threads:[~2002-07-29 8:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-28 19:37 New connections stall with 20k+ open sockets Karthik Arumugham
2002-07-29 8:48 ` Willy Tarreau [this message]
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