Date: Sun, 27 Jan 2002 21:04:20 +0000 From: Neil McGann <neil@neilmcgann.co.uk> To: Kent Stewart <kstewart@owt.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: UDMA and 100Mbit NIC speed issues Message-ID: <5.1.0.14.0.20020127203502.00a32240@pop.ntlworld.com> 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>
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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
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