Messages in this thread | | | Date | Wed, 21 Mar 2001 19:14:04 -0700 | From | TimO <> | Subject | Re: Only 10 MB/sec with via 82c686b chipset? |
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egger@suse.de wrote: > > On 20 Mar, SodaPop wrote: > > > I have an IWill KK-266R motherboard with an athlon-c 1200 > > processor in it, and for the life of me I can't get more than > > 10 MB/sec through the on-board ide controller. Yes, all the > > appropriate support is turned on in the kernel to enable dma > > and specific chipset support, and yes, I think I have all > > relevant patches and a reasonable kernel. > > Yes, actually I'm seeing the same on a KT133 board from Elitegroup. > Although here I get a bit more: 15 MB/s > > > I noted a number of other interesting things; one, that -X33, > > -X34, and -X64 through -X69 all have the same 10 MB/sec transfer > > rate, and two, that the 10 MB/sec transfer rate can be linearly > > increased to 12 MB/sec by raising the system bus from 100 mhz to > > 120 mhz (all components are safely rated at 133, no overclocking > > involved.) > > Duh, before making such a claim you should consider the fact that > this is overclocking your PCI/AGP bus and I have yet to see any > graphic cards/IDE controllers/other devices which are rated for > 37MHz PCI bus speed. > > -- > > Servus, > Daniel
Actually this depends on the MB. On mine for instance (Athlon also, but not IWill), the PCI bus is a quotient of the oscillator and the FSB is a multiple of the PCI and the CPU & ev6 are multiples of the FSB. Memory speed is also a multibple of PCI. In this case increasing the FSB doesn't increase the PCI. Mine has two crystals 100/133 jumper con- figurable.
Anyway this is probably getting way off-topic; although I'd kinda like to see Dennis' output of both buffered and sustained output. Looks kinda like a hw config problem. Mine for comparison:
Maxtor 13.4 Gig 5400rpm ATA66 Buffered: ~170 - 175 MB Sustained: ~24 MB inner ~26 MB outer PCI: 33 FSB: 100 Memory 128M@133 CPU: 750Mhz EV6: 200
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