On Wed, Jan 31, 2001 at 07:46:31PM -0500, Byron Stanoszek wrote:
> > yea i know. . same mode i also had a big problem with DMA timeouts on
> > 2.4 so .. i dont know what's up with 2.4 and my motherboard ... 2.2
> > hasn't shown a single irq or DMA error yet since going back to it.
> > currently 2.2.19-pre7 is using UDMA4 i just flashed the bios today so ..
> > hopefully that should have fixed any problems. I get 24MB/s each according
> > to hdparm -t on my hdd's and both are on the same channel. This is much
> > better than i ever got with 2.4 even when only one drive was on a channel.
> > Right now my k7-2 750 is at 849mhz with a FSB of 114Mhz and PCI at 34Mhz.
> > my nbench performance under 2.2 is comparable to results for 1Ghz t-bird's so
> > i'm happy with 2.2. The only thing that would make me want to upgrade would
> > be latency patches. I'm convinced 2.4 has performance issues so i guess i'll
> > be using 2.2 until 2.5 begins. Is it really only 1 or 2 people having
> > this Via corruption problem? i doubt it's a bios problem because wouldn't
> > 2.2 be effected by a bios bug if 2.4 is? In either case the changelogs dont
> > show any fixes for it.
>
> If your FSB is running at 114 MHz, you should try the kernel parameter
> idebus=37 to get DMA working correctly. Otherwise you'll see an ide-reset error
> on bootup because the instructions are too fast. The VIA driver on 2.2 doesn't
> correctly program the PCI card, so you don't see weird behavior running 2.2
> with a faster PCI clock.
>
> (Note: 1.14 * 33 = 37.6 PCI Clk)
It's 38:
114 / 3 == 38 == 1.14 * 33.333333
But definitely it isn't 34 or the default 33.
--
Vojtech Pavlik
SuSE Labs