Messages in this thread | | | Date | Fri, 05 Dec 2008 14:04:21 +0100 | From | Eric Dumazet <> | Subject | Re: MSI changes in .28 |
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Ingo Molnar a écrit : > The MSI IRQ number is a pure software detail that was already non-stable > due to device detection ordering, etc. It's counted back from NR_IRQS, > and the sizing of NR_IRQS changed (upwards) in 2.6.28 - that's what you > see. > > The fact that MSI numbers goes back from NR_IRQs i consider a (minor) > misbehavior: it should not count down but should count up - and it should > not go to unreasonably high numbers if possible - that is confusing to > users when the sizing of NR_IRQS changes to to a higher NR_CPUS for > example. > > A better (because more human-compatible) numbering scheme is to start > counting upwards from the high end of physical interrupt lines. We've > done that in the for-.29 sparseirq tree - there we'll start counting from > 256 upwards in essence. (the first 256 IRQs are GSI interrupts) > > Maybe it should be counted starting at 1000? That might be an even more > human-friendly numbering scheme.
I agree a better scheme would be good, given some distros use NR_CPUS=256
I had a (legacy & buggy) program that segfaulted when parsing /proc/stat on new kernel (NR_CPUS=64)
$ cat /proc/stat cpu 386 0 534 38332 1193 0 7 0 0 cpu0 26 0 101 4757 195 0 0 0 0 cpu1 32 0 29 4884 142 0 1 0 0 cpu2 32 0 93 4727 218 0 1 0 0 cpu3 35 0 55 4829 141 0 1 0 0 cpu4 58 0 53 4810 135 0 0 0 0 cpu5 112 0 47 4755 137 0 0 0 0 cpu6 47 0 95 4754 100 0 0 0 0 cpu7 40 0 57 4813 123 0 0 0 0 intr 38370 123 4 0 0 0 0 0 0 0 0 0 0 5 0 0 0 0 0 0 0 0 0 93 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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cat /proc/stat|wc 15 2406 4980 $ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 0: 122 0 1 0 0 0 0 0 IO-APIC-edge timer 1: 1 1 0 0 0 0 1 1 IO-APIC-edge i8042 9: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi acpi 12: 0 0 1 1 1 2 0 0 IO-APIC-edge i8042 14: 0 0 0 0 0 0 0 0 IO-APIC-edge ide0 15: 0 0 0 0 0 0 0 0 IO-APIC-edge ide1 16: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi uhci_hcd:usb1 17: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi uhci_hcd:usb2 18: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi uhci_hcd:usb3 19: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi uhci_hcd:usb4 22: 11 13 11 10 13 13 9 13 IO-APIC-fasteoi uhci_hcd:usb5 2292: 49 44 119 121 111 110 140 142 PCI-MSI-edge eth1 2293: 6 6 4 9 7 10 7 5 PCI-MSI-edge eth0 2294: 637 638 564 557 570 563 549 539 PCI-MSI-edge cciss0 NMI: 0 0 0 0 0 0 0 0 Non-maskable interrupts LOC: 5053 4982 3564 3552 3069 3256 3541 2363 Local timer interrupts RES: 62 83 33 78 150 204 75 179 Rescheduling interrupts CAL: 55 69 66 64 60 60 63 60 Function call interrupts TLB: 267 192 253 194 440 354 435 387 TLB shootdowns TRM: 0 0 0 0 0 0 0 0 Thermal event interrupts SPU: 0 0 0 0 0 0 0 0 Spurious interrupts ERR: 0 MIS: 0
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