Re: What determines which interrupts are shared under Linux?

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Sergei Shtylyov wrote:
Hello,

I have identified that the disks that are shared on ide2, ide3 do funny
things when both are being heavily used (dma_expiry), this is an older driver versions but I have experienced it before with a lot newer driver, and a bios adjustment previously fixed a similar issue, so that may be what is needed in this case also, I am not sure how they fixed it, but I suspect that the setup the interrupt
to not be shared.

   I doubt that your suspicions are justified.

  I have a large number of machines and under heavy loads all
seem to duplicate the issue, and it always happens with the disks on ide2/ide3,
never on the disk connected to ide4.

   BTW, you never named your particular IDE hardware.

NVIDIA, CK804 chipset.

And the disks are on the sata part, and are found as e g and i so if
they are in legacy mode, it would make me suspect that the disks believe
they are on separate channels, and the performance characteristics appear
to confirm that as the disks don't seem to interfere with each other.


           CPU0       CPU1       CPU2       CPU3
  0:   56616921    5359998    7002142     938817          XT-PIC  timer
  1:          8         88         96          0    IO-APIC-edge  i8042
  2:          0          0          0          0          XT-PIC  cascade
  4:       2091        100        208       2477    IO-APIC-edge  serial
  8:          0          0          0          0    IO-APIC-edge  rtc
  9:          0          0          0          0   IO-APIC-level  acpi
20: 0 0 0 0 IO-APIC-level ehci_hcd 21: 0 950 401419 414482 IO-APIC-level ide4, ohci_hcd 22: 1165 1704243 576247 6796 IO-APIC-level ide2, ide3
 47:      65971          0          0          0   IO-APIC-level  eth0
NMI:          1          1          1          1
LOC:   69904264   69877733   69879541   69901903
ERR:          0
MIS:        105

MBR, Sergei

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