I have this hardware:

pciide0 at pci0 dev 13 function 0: Acard ATP860-A Ultra66 IDE Controller
(rev. 0x01)
pciide0: bus-master DMA support present
pciide0: primary channel wired to native-PCI mode
pciide0: using irq 23 for native-PCI interrupt
wd0 at pciide0 channel 0 drive 0: <WDC WD205BA>
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 19574 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 40088160 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
wd0(pciide0:0:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
(using DMA data transfers)
pciide0: secondary channel wired to native-PCI mode
wd1 at pciide0 channel 1 drive 0: <WDC WD307AA>
wd1: drive supports 16-sector PIO transfers, LBA addressing
wd1: 29333 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 60074784 sectors
wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
wd1(pciide0:1:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
(using DMA data transfers)

in a macppc system running a relatively recent -current kernel (circa May
16).  (In case you can't immediately decode the dmesg output, that's a
Sonnet Tempo ATA-66 Mac-compatible card with one drive on each channel.)

I was doing a cvs update of the netbsd 'src' module to one of the two
drives, and I decided to do a simple throughput test ('cat /dev/zero >foo')
on the other one at the same time.  The machine seemed to pause for a bit (I
was accessing it remotely), and when it came back I had a couple dozen of
these in my logs:

May 23 17:41:45 macppc /netbsd: pciide0:0:0: lost interrupt
May 23 17:41:45 macppc /netbsd:         type: ata tc_bcount: 8192 tc_skip: 0
May 23 17:41:45 macppc /netbsd: pciide0:1:0: lost interrupt
May 23 17:41:45 macppc /netbsd:         type: ata tc_bcount: 65536 tc_skip:
0
May 23 17:41:55 macppc /netbsd: pciide0:0:0: lost interrupt
May 23 17:41:55 macppc /netbsd:         type: ata tc_bcount: 8192 tc_skip: 0
May 23 17:41:55 macppc /netbsd: pciide0:1:0: lost interrupt
May 23 17:41:55 macppc /netbsd:         type: ata tc_bcount: 65536 tc_skip:
0

The errors weren't fatal; the machine's still up.  I've unmounted all
filesystems residing on one of the two drives for my own peace of mind.
(The drive is new and has nothing on it yet.)

Any ideas what's going on here?  Is anyone out there using both channels of
this model adapter under heavy load?

Thanks,
-- monroe
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Monroe Williams                                         monroe@pobox.com