NetBSD-9.99.77's piixide, misses (lot's of) interupts on DELL Poweredge R310

Hello,

I tried to test-run 9.99.77's XEN3_DOM0 kernel on a DELL PowerEdge R310
that runs NetBSD-6.1.5's XEN3_DOM0 just fine. (dmesg excerpt below)

9.99.77, however, produces lots of 

piixide0:0:0: lost interupt
[some timestamp] type ata tc_bcount: [some multiple of 512] tc_skip: 0
and 
piixide0:1:0: lost interupt
[some timestamp] type ata tc_bcount: [some multiple of 512] tc_skip: 0

Boot progress is at roughly one or two transactions per minute.

We had to repower the machine, so no full dmesg of this is available.
Any guess as to what kernel variant I should try to get this going?

Regards
	-is


dmesg from 6.1.5:
[...]
hypervisor0 at mainbus0: Xen version 4.5.3
VIRQ_DEBUG interrupt using event channel 1
[...]
pcib0 at pci0 dev 31 function 0: vendor 0x8086 product 0x3b14 (rev. 0x05)
piixide0 at pci0 dev 31 function 2: Intel 3400 Serial ATA Controller (rev. 0x05)
piixide0: bus-master DMA support present
piixide0: primary channel configured to native-PCI mode
piixide0: using ioapic0 pin 20, event channel 6 for native-PCI interrupt
atabus0 at piixide0 channel 0
piixide0: secondary channel configured to native-PCI mode
atabus1 at piixide0 channel 1
piixide1 at pci0 dev 31 function 5: Intel 3400 Serial ATA Controller (rev. 0x05)
piixide1: bus-master DMA support present
piixide1: primary channel wired to native-PCI mode
piixide1: using ioapic0 pin 21, event channel 7 for native-PCI interrupt
atabus2 at piixide1 channel 0
piixide1: secondary channel wired to native-PCI mode
atabus3 at piixide1 channel 1