From owner-freebsd-questions Sat Jan 30 16:32:34 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id QAA13507 for freebsd-questions-outgoing; Sat, 30 Jan 1999 16:32:34 -0800 (PST) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from allegro.lemis.com (allegro.lemis.com [192.109.197.134]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id QAA13501 for ; Sat, 30 Jan 1999 16:32:30 -0800 (PST) (envelope-from grog@freebie.lemis.com) Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by allegro.lemis.com (8.9.1/8.9.0) with ESMTP id LAA10631 for ; Sun, 31 Jan 1999 11:02:26 +1030 (CST) Received: (from grog@localhost) by freebie.lemis.com (8.9.2/8.9.0) id LAA57703 for questions@FreeBSD.org; Sun, 31 Jan 1999 11:02:25 +1030 (CST) Date: Sun, 31 Jan 1999 11:02:25 +1030 From: Greg Lehey To: FreeBSD Questions Subject: Excessive collisions on Ethernet Message-ID: <19990131110224.I8473@freebie.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.1i WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In the last few days I've noticed a really high number of collisions on my Ethernet. There are only 5 machines on the network, 3 of which are barely active, yet I see: (allegro, running 2.2.6-STABLE) ed0 1500 00.00.c0.44.a5.68 43729816 45 43861788 12 977828 ed0 1500 widecast allegro 43729816 45 43861788 12 977828 (freebie, running 4.0-CURRENT) Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll ed2 1500 00.80.48.e6.a0.61 11976144 12 13389307 0 988340 ed2 1500 widecast freebie 11976144 12 13389307 0 988340 (panic, running 3.0-CURRENT) ep0 1500 00.a0.24.37.0c.bd 267 0 286 1 0 ep0 1500 widecast panic 267 0 286 1 0 (papillon, running an old 3.0-CURRENT) zp0 1500 00.60.97.40.fb.e1 734161 11 544548 60 0 zp0 1500 widecast papillon 734161 11 544548 60 0 (yana, running 2.2.6-RELEASE) ed0 1500 00.00.b4.33.6d.a2 8097 19 5948 0 43 ed0 1500 widecast yana 8097 19 5948 0 43 The low values for panic and yana are because of a power fail last night: these two machines aren't on a UPS. I tried an ftp from panic, copying a file of 45 MB from freebie. The transfer ran at about 1 MB/s with about 450 collisions per second on the freebie side, none on the panic side. Here are the values before and after: freebie: Ipkts Ierrs Opkts Oerrs Coll before 11978350 13 13392678 0 989089 after 11994616 13 13424921 0 1009912 diff 16266 0 32243 0 20823 panic: Ipkts Ierrs Opkts Oerrs Coll before 480 0 651 1 0 after 32143 0 16679 1 0 diff 31663 0 16028 0 0 Looking at these results (40% collision rate on freebie), it would seem that something is seriously wrong in the network. On the other hand, allegro also shows a large number of collisions. At the moment I'm suspecting the (3 month old) Ethernet board in freebie, but I was wondering if there were other reasons which might apply. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message