From owner-freebsd-net@FreeBSD.ORG Mon Dec 26 18:15:32 2005 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C04B216A41F for ; Mon, 26 Dec 2005 18:15:32 +0000 (GMT) (envelope-from skylar@cs.earlham.edu) Received: from quark.cs.earlham.edu (cs.earlham.edu [159.28.230.3]) by mx1.FreeBSD.org (Postfix) with ESMTP id C472643D5C for ; Mon, 26 Dec 2005 18:15:29 +0000 (GMT) (envelope-from skylar@cs.earlham.edu) Received: from [192.168.0.11] (CPE-67-48-232-40.new.res.rr.com [67.48.232.40]) (authenticated bits=0) by quark.cs.earlham.edu (8.13.4/8.13.3) with ESMTP id jBQIFMEn003486 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 26 Dec 2005 13:15:23 -0500 (EST) (envelope-from skylar@cs.earlham.edu) Message-ID: <43B03332.2010904@cs.earlham.edu> Date: Mon, 26 Dec 2005 12:15:14 -0600 From: Skylar Thompson Organization: Earlham College Computer Science Department User-Agent: Debian Thunderbird 1.0.7 (X11/20051017) X-Accept-Language: en-us, en MIME-Version: 1.0 To: freebsd-net@freebsd.org X-Enigmail-Version: 0.93.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigF65FB0995D74227B5B2C8E01" X-Greylist: Sender succeded SMTP AUTH authentication, not delayed by milter-greylist-1.6 (quark.cs.earlham.edu [159.28.230.3]); Mon, 26 Dec 2005 13:15:24 -0500 (EST) X-Virus-Scanned: ClamAV 0.87.1/1218/Mon Dec 26 08:46:59 2005 on quark.cs.earlham.edu X-Virus-Status: Clean X-Scanned-By: MIMEDefang 2.52 on 159.28.230.3 X-Spam-Status: No, score=0.1 required=8.0 tests=RCVD_IN_SORBS_DUL autolearn=no version=3.0.4 X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on quark.cs.earlham.edu Subject: DHCP oddity X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: skylar@cs.earlham.edu List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Dec 2005 18:15:32 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigF65FB0995D74227B5B2C8E01 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit While doing some network stress-tests from a dual-CPU x86 FreeBSD 5.4 server, I noticed that a "ping -f" drives dhcpd's CPU usage way up. I put dhcpd into debug mode and didn't get any error messages. I then ran dhcpd with strace, and saw loads of these messages when I started the ping flood: select(8, [?], [?], [?], NULL) = 1 () gettimeofday({...}, NULL) = 0 recvfrom(4, 0xbfbfe090, 1500, 0, {...}, [?]) = 84 select(8, [?], [?], [?], NULL) = 1 () gettimeofday({...}, NULL) = 0 recvfrom(4, 0xbfbfe090, 1500, 0, {...}, [?]) = 84 Does anyone know why this would happen? -- -- Skylar Thompson (skylar@cs.earlham.edu) -- http://www.cs.earlham.edu/~skylar/ --------------enigF65FB0995D74227B5B2C8E01 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFDsDM2sc4yyULgN4YRAna3AJ9sR2svv4iI5CFsnIYH6nCNYVlTKACeLXS9 xrdkNDcbEPUz4iI4AIVQOkU= =Zsdw -----END PGP SIGNATURE----- --------------enigF65FB0995D74227B5B2C8E01--