Messages in this thread | | | Date | Thu, 22 Mar 2001 20:38:18 -0600 (CST) | From | SodaPop <> | Subject | Re: Only 10 MB/sec with via 82c686b - FIXED |
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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 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 >
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