From owner-freebsd-questions Sun Jan 27 13: 3:31 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mta06-svc.ntlworld.com (mta06-svc.ntlworld.com [62.253.162.46]) by hub.freebsd.org (Postfix) with ESMTP id DD7D837B404 for ; Sun, 27 Jan 2002 13:03:28 -0800 (PST) Received: from neildesk.neilmcgann.co.uk ([213.107.105.120]) by mta06-svc.ntlworld.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with ESMTP id <20020127210325.WOVY7000.mta06-svc.ntlworld.com@neildesk.neilmcgann.co.uk>; Sun, 27 Jan 2002 21:03:25 +0000 Message-Id: <5.1.0.14.0.20020127203502.00a32240@pop.ntlworld.com> X-Sender: neil.mcgann@pop.ntlworld.com X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Sun, 27 Jan 2002 21:04:20 +0000 To: Kent Stewart From: Neil McGann Subject: Re: UDMA and 100Mbit NIC speed issues Cc: freebsd-questions@FreeBSD.ORG In-Reply-To: <3C52539A.3090704@owt.com> References: <5.1.0.14.0.20020125204321.00a0f4c0@pop.ntlworld.com> <3C51D185.2090600@owt.com> <5.1.0.14.0.20020125235403.00a1f930@pop.ntlworld.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed 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 Hi Kent, I fixed the problem by hacking /usr/src/sys/dev/ata/ata-dma.c to prevent the 82C686B southbridge being set higher than UDMA66. It works just fine at UDMA66 - 11Mb/s down/7Mb/s upload. Shame there isn't a cleaner way of tweaking disk parameters since the BIOS settings are ignored. There's either a bug in the 82C686B driver at >66, a chipset/pci parameter issue - or it could be simply due to the PCI slots and southbridge sharing the same physical PCI bus on my mobo. Realistically 100Mb/sec is flat out for 33MHz PCI and trying to get some bandwidth for the NIC may just not be do-able. Neil To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message