Date: Mon, 18 Jun 2007 05:21:09 +1000 From: Peter Jeremy <peterjeremy@optushome.com.au> To: "M. Warner Losh" <imp@bsdimp.com> Cc: net@freebsd.org Subject: Re: Issue with huge numbers of connections Message-ID: <20070617192109.GG22547@turion.vk2pj.dyndns.org> In-Reply-To: <20070617.130238.-1435629453.imp@bsdimp.com> References: <20070617.114133.778151882.imp@bsdimp.com> <46757818.5030005@joeholden.co.uk> <20070617.130238.-1435629453.imp@bsdimp.com>
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--tThc/1wpZn/ma/RB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2007-Jun-17 13:02:38 -0600, "M. Warner Losh" <imp@bsdimp.com> wrote: >Doing the math on 10^9 connections in a week translates to ~1650/s, so we'd >expect there are on the order of 100-200 connections steady state at any >time. I suspect that the peak load may be up to 100 times that, which is >still only 20000 connections. The hangs don't seem to hang at a peak, but >randomly. Note that the TCP state machine includes a 2xMSL (128 second) timeout after the connection closes before the kernel releases the TCP control block. There may not be many connections open but at 1650 connections per second, there are about 200,000 control blocks in TCPS_TIME_WAIT - far more if the load is peaky. --=20 Peter Jeremy --tThc/1wpZn/ma/RB Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFGdYml/opHv/APuIcRAivWAJ4mHAwI4CH/xLvNKSJo5N1D2BGGJwCfdG78 VkRBP3W/3Wdd5Z3BsLw461U= =mfwv -----END PGP SIGNATURE----- --tThc/1wpZn/ma/RB--
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