Date: Wed, 5 Jan 2005 16:04:09 -0800 From: Tom Samplonius <tom.samplonius@gmail.com> To: freebsd-stable@freebsd.org Subject: Re: SATA/UDMA100 support on ATI RS300 chipset? Message-ID: <ff2e0a1a0501051604361b9075@mail.gmail.com> In-Reply-To: <ff2e0a1a050105160211f908f8@mail.gmail.com> References: <ff2e0a1a05010500212b4bf5d8@mail.gmail.com> <41DC0DFB.60503@jim-liesl.org> <ff2e0a1a050105103834a71191@mail.gmail.com> <41DC6B4C.5000502@jim-liesl.org> <ff2e0a1a050105160211f908f8@mail.gmail.com>
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On Wed, 05 Jan 2005 15:33:48 -0700, secmgr <security@jim-liesl.org> wrote: > That would be ASUS who would have embedded the 3COM chip. probably > special order, which is why it didn't report back something recognized. > The ATI chipset is pretty new vs the more tried and known > nVIDIA/SiS/VIA/AMD [South|North]bridges and the Intel hubs > > Running current can be "exciting". Since you seem to have networking > covered, you may want to look at a SATA pci card thats "known" to > freebsd. In theory, the box has two slots. > > jim The 3com chip is not recognized, since it very new. It is mostly used in laptops. SATA drives attached to the ATI RS300 works fine in 5.3-RELEASE, except that FreeBSD detects the disk as UDMA33, and performance isn't good. PATA disks have better performance on the Pundit-R, even though they are also detected as UDMA33. In fact, I wonder if PATA disks are actually operating at UDMA66 or UDMA100, but FreeBSD doesn't know this, as it it is treating the ATI controller as a generic ATA controller. The reason why I suspect this, is that my PATA disk can do 30MB/s read, and I don't think it is possible to get 30MB/s through a UDMA33 connection, especially with the ATA/IDE overhead. The question I have is, can I trick FreeBSD by adding the device ids for the ATI chipset, at least for IDE? It appears that all of the nVIDIA/SiS/VIA/AMD [South|North]bridges are fairly similar as far as the drivers are concerned. Tom
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