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Date: Fri, 05 Dec 2008 14:04:21 +0100
From: Eric Dumazet <dada1@...mosbay.com>
To: Ingo Molnar <mingo@...e.hu>
CC: Frans Pop <elendil@...net.nl>,
Linus Torvalds <torvalds@...ux-foundation.org>, rjw@...k.pl,
greg@...ah.com, jbarnes@...tuousgeek.org, lenb@...nel.org,
linux-kernel@...r.kernel.org, tiwai@...e.de,
akpm@...ux-foundation.org, ink@...assic.park.msu.ru,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: MSI changes in .28
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 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 771 39 4602 0 0 0 0 0 0 0 0 0
ctxt 110659
btime 1228482025
processes 5163
procs_running 1
procs_blocked 1
$ 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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