Re: PDC20265 / 2.5.10 / Alpha (Miata) - unexpected interrupt flood

[Martin Dalecki <dalecki@evision-ventures.com>]

Uz.ytkownik Jurriaan on Alpha napisa?:
> I'm running linux-2.5.10 on my Miata Alpha system, and I get a *lot* of
> messages like this:
> 
> ide: unexpected interrupt 1 44
> 
> The limiting in drivers/ide/ide.c works fine, I never get more than 1 a
> second or something like that. Still, 1 per second is a lot.
> 
> dmesg (system parameters/ide messages):
> 
> Linux version 2.5.10 (root@alpha) (gcc version 2.95.4 20011002 (Debian prerelease)) #1 Fri Apr 26 09:54:57 CEST 2002
> Booting on Miata using machine vector Miata from SRM
> Command line: ro root=/dev/sda1 video=tdfx:1600x1200-16@85,nohwcursor
> memcluster 0, usage 1, start        0, end      236
> memcluster 1, usage 0, start      236, end   196607
> memcluster 2, usage 1, start   196607, end   196608
> freeing pages 236:384
> freeing pages 839:196607
> reserving pages 839:842
> pci: cia revision 1 (pyxis)
> On node 0 totalpages: 196607
> zone(0): 196607 pages.
> zone(1): 0 pages.
> zone(2): 0 pages.
> Kernel command line: ro root=/dev/sda1 video=tdfx:1600x1200-16@85,nohwcursor
> HWRPB cycle frequency bogus.  Estimated 499787208 Hz
> Calibrating delay loop... 990.32 BogoMIPS
> Memory: 1553416k/1572856k available (2280k kernel code, 17552k reserved, 676k data, 376k init)
> pci: passed tb register update test
> pci: passed sg loopback i/o read test
> pci: passed pte write cache snoop test
> pci: failed valid tag invalid pte reload test (mcheck; workaround available)
> pci: passed pci machine check test
> pci: tbia workaround enabled
> Uniform Multi-Platform E-IDE driver ver.:7.0.0
> ide: system bus speed 33MHz
> CMD Technology Inc PCI0646: IDE controller on PCI slot 00:04.0
> CMD Technology Inc PCI0646: chipset revision 1
> CMD Technology Inc PCI0646: not 100% native mode: will probe irqs later
> CMD Technology Inc PCI0646: chipset revision 0x01, MultiWord DMA Limited, IRQ workaround enabled
> CMD Technology Inc PCI0646: simplex device:  DMA disabled
> ide0: CMD Technology Inc PCI0646 Bus-Master DMA was disabled by BIOS
> CMD Technology Inc PCI0646: simplex device:  DMA disabled
> ide1: CMD Technology Inc PCI0646 Bus-Master DMA was disabled by BIOS
> Promise Technology, Inc. 20265: IDE controller on PCI slot 01:0a.0
> Promise Technology, Inc. 20265: chipset revision 2
> Promise Technology, Inc. 20265: not 100% native mode: will probe irqs later
> Promise Technology, Inc. 20265: ROM enabled at 0x20020000
> Promise Technology, Inc. 20265: (U)DMA Burst Bit DISABLED Primary PCI Mode Secondary PCI Mode.
> Promise Technology, Inc. 20265: FORCING BURST BIT 0x00 -> 0x01 ACTIVE
>     ide2: BM-DMA at 0x9000-0x9007, BIOS settings: hde:pio, hdf:pio
>     ide3: BM-DMA at 0x9008-0x900f, BIOS settings: hdg:DMA, hdh:pio
> hdg: IBM-DTLA-307045, ATA DISK drive
> ide3 at 0x9048-0x904f,0x9056 on irq 44
> hdg: 90069840 sectors (46116 MB) w/1916KiB Cache, CHS=89355/16/63, UDMA(100)
> Partition check:
>  hdg: [PTBL] [5606/255/63] hdg1 hdg2
> 
> Has anything changed? I ran 2.4.x since 2.4.10 or so on this machine

Yes. This message has been added. It's harmless.
It will happen if the interrupt in question is shared
among different devices for example.