From owner-freebsd-hackers Mon May 10 11:40:16 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from apollo.backplane.com (apollo.backplane.com [209.157.86.2]) by hub.freebsd.org (Postfix) with ESMTP id 2989E15199 for ; Mon, 10 May 1999 11:40:14 -0700 (PDT) (envelope-from dillon@apollo.backplane.com) Received: (from dillon@localhost) by apollo.backplane.com (8.9.3/8.9.1) id LAA69281; Mon, 10 May 1999 11:37:57 -0700 (PDT) (envelope-from dillon) Date: Mon, 10 May 1999 11:37:57 -0700 (PDT) From: Matthew Dillon Message-Id: <199905101837.LAA69281@apollo.backplane.com> To: "Pedro J. Lobo" Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: What is a "transmit underflow"? References: Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG :Hi, all. : :I've got two FreeBSD boxes (3.1-R) working as routers, one with two 4-port :ZNYX 10/100 ethernet cards and the other with one of those cards. The :cards have DEC chips (21140A). : :The routers are working perfectly, but from time to time I get the :following messages: : :de0: abnormal interrupt: transmit underflow (raising TX threshold to 96|256) :de1: abnormal interrupt: transmit underflow (raising TX threshold to 96|256) : :What do they mean? Everything seems to be OK, but I'd like to know wether :I have to worry about this or not. : :TIA, : : Pedro. : :Pedro José Lobo Perea Tel: +34 91 336 78 19 Don't worry about it, it happens with most tulip-based cards. The cards seem to have a hard time staging DMA but the device driver takes care of it. We have some machines that bump it all the way up to 1024. de0: enabling 100baseTX port de0: enabling Full Duplex 100baseTX port ... de0: abnormal interrupt: transmit underflow (raising TX threshold to 96|256) ... de0: abnormal interrupt: transmit underflow (raising TX threshold to 8|512) ... de0: abnormal interrupt: transmit underflow (raising TX threshold to 1024) -Matt Matthew Dillon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message