From owner-freebsd-questions Thu Feb 20 8:23:19 2003 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B583D37B401 for ; Thu, 20 Feb 2003 08:23:18 -0800 (PST) Received: from bragi.housing.ufl.edu (bragi.housing.ufl.edu [128.227.47.18]) by mx1.FreeBSD.org (Postfix) with ESMTP id D8E6843FAF for ; Thu, 20 Feb 2003 08:23:17 -0800 (PST) (envelope-from WillS@housing.ufl.edu) content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-MimeOLE: Produced By Microsoft Exchange V6.0.6249.0 Subject: network tuning Date: Thu, 20 Feb 2003 11:23:17 -0500 Message-ID: <0E972CEE334BFE4291CD07E056C76ED8DB2B69@bragi.housing.ufl.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: network tuning Thread-Index: AcLY/JpujqPgV96RSZKZkQs1L3WB8Q== From: "Will Saxon" To: Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG I am trying to use ntop in the 'border filter' mode to get some = statistics on that link, which is a gigE link typically seeing = 40-120Mbps sustained traffic (varies throughout the day). The capturing = interface is an intel pro/100+ server adapter, plugged into another port = on the switch set to mirror the gigE interface. Obviously there ought to be some drops due to serialization differences, = etc. But ntop is reporting upwards of 2/3 packets dropped in the kernel = and running tcpdump on that interface for any length of time reports = usually 50% drops in the kernel. I have enabled the link0 processing offload onto the nic, changed the = nmbclusters sysctl, and raised all of the send/recvspace sysctl's. I = read the tuning manpage, and applied whatever looked applicable with no = discernable results. The system is running FreeBSD 4.8-PRERELEASE. Machine is a dual p3 = 1.4GHz with 2.2GB ram and 1 15krpm IBM SCSI drive on a LSI/symbios logic = u160 card. It is using a via chipset tyan tiger 230T, which is = understandably nothing special.=20 Is there something else I should try, besides getting a gigE card (and = gbic) to try again? I feel like I am not setting something up correctly. -Will To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message