Re: Mobo dying hard with DMA support

Andrew Morton (andrewm@uow.edu.au)
Mon, 05 Jun 2000 03:23:14 +1000

Dan Hollis wrote:
>
> On Sun, 4 Jun 2000, Andrew Morton wrote:
> > Dan Hollis wrote:
> > > HPT366 on BP6 is horribly broken, forget this controller as if it never
> > > existed. Get a cheap PDC20262 and use it instead.
> > Cheery little counterpoint: my HPT366/BP6 consistently gets ~20
> > Mbytes/sec using UDMA66 and has done so with rock-solidity for every
> > kernel between 2.3.4x and present (although I missed test1-ac6).
> > The 2.2 patches work nicely as well. I use the -QQ beta BIOS.
>
> SMP?

Yes. Overclocked 500->565!

> And which drives on the HPT366? Manufacturer and model #...

2 x Seagate ST313021A (13 gig) on a single 80-way cable.

> If you want some real fun, put some CDROM/CDRW on the HPT366 channels and
> then try to enable DMA (UDMA or regular DMA), instant lockup... no fun at
> all...

I seem to recall that this machine fails mysteriously with 'nosmp
noapic'. But it's only used for two things: compiling kernels and
running fsck. Does both these quite well.

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