On Thu, Jan 03, 2002 at 02:45:05PM -0600, Richard Rauch wrote:
> > It's possible that NetBSD doesn't use DMA for you disk on the tower.
> > Can you post your dmesg to see what chipset this is exactly ?
> 
> Sure.  Here are ~20 relavent lines from near the top.  (The rest can be
> provided if really desired.)  Note that it claims to be using DMA.
> 
> 
> pchb0: VIA Technologies product 0x0305 (rev. 0x02)
> ppb0 at pci0 dev 1 function 0: VIA Technologies product 0x8305 (rev. 0x00)
> pci1 at ppb0 bus 1
> pci1: i/o space, memory space enabled
> pcib0 at pci0 dev 7 function 0
> pcib0: VIA Technologies VT82C686A (Apollo KX133) PCI-ISA Bridge (rev. 0x22)
> pciide0 at pci0 dev 7 function 1: VIA Tech VT82C586A IDE Controller (rev. 0x10)
> pciide0: bus-master DMA support present
> pciide0: primary channel configured to compatibility mode
> wd0 at pciide0 channel 0 drive 0: <Maxtor 52049H4>
> wd0: drive supports 16-sector pio transfers, lba addressing
> wd0: 19541 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 40020624 sectors
> wd0: 32-bit data port
> wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5
> pciide0: primary channel interrupting at irq 14
> wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (using DMA data transfers)
> pciide0: secondary channel configured to compatibility mode
> atapibus0 at pciide0 channel 1
> cd0 at atapibus0 drive 0: <ATAPI 48X CDROM, 48XCDROM Ver3.30, VER-3.3> type 5 cdrom removable

Hum, OK. 1.5.x has problems with this chipset which may explain your
slowdowns. This should be fixed in -current, but back-porting it to 1.5
involves more than just pciide. I'll try to get something done, though.

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
--