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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


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