Regarding the overclocking of the PCI bus, I was not aware of this. The
documentation led me to believe the pci clock was fixed, however further
experimentation indicates that's clearly not the case. Thanks.
Regarding the fix: I installed an Ensonique AudioPci sound card, and
experienced horrible distortion, crackling, and high pitched chirps any
time I tried to use the device. I noticed that various interrupts were
causing chunks of the real audio to sometimes slip through; on a whim I
tried ping flooding a nearby machine and the sound quality improved
greatly.
Putting two and two together, it occurred to me that the motherboard was
having irq/interrupt routing problems. The disks could not get reasonable
throughput because the interrupts were getting choked or held up, and the
sound card couldn't properly function either.
Wonder of wonders, I flashed the bios to the latest and greatest version.
Current data transfer rates are 35.7 MB/sec on both udma drives, exactly
as expected and darn close to the continuous read limits of the disks.
The audio also started working, flawlessly.
There are other issues however - the athlon now runs significantly hotter
at idle for one, but the most serious is that the K7 kernel optimizations
cause horrendous kernel panics and crashes. I'm running now on a kernel
compiled for 386, which seems to be stable. I'll attempt to build other
kernels to see if I can figure out whats going on.
Net result: IWill KK266 motherboards have bios problems, it may be a good
idea to upgrade the bios.
-dennis T
On Wed, 21 Mar 2001 [EMAIL PROTECTED] 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
>
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