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Somewhat random question about IRQ sharing [ANSWERED]
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paulbiz
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Joined: 01 Feb 2004
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Location: St. Louis, Missouri, USA

PostPosted: Sat Jan 26, 2008 2:40 am    Post subject: Somewhat random question about IRQ sharing [ANSWERED] Reply with quote

Hi,

I'm running an ~amd64 Gentoo system. An Intel Core 2 Duo E6600 processor and NForce 680i-based Abit motherboard. During my most recent boot-up, I noticed the hardware list in the POST process showing a few devices sharing IRQs. I never really paid much attention to it before, and my system is generally running fine. Is there a danger to this arrangement of IRQ sharing or a benefit from working on spreading the load around in a different way? I googled but it seems advice in this area is very hardware specific as well as being old (which doesn't make it wrong). Here's my /proc/interrupts:

Code:
foo@e6600 ~ $ cat /proc/interrupts
           CPU0       CPU1
  0:        173          0   IO-APIC-edge      timer
  1:          2          0   IO-APIC-edge      i8042
  2:          0          0    XT-PIC-XT        cascade
  5:        197        576   IO-APIC-fasteoi   sata_nv, ohci1394, HDA Intel
  6:          5          0   IO-APIC-edge      floppy
  8:          0          0   IO-APIC-edge      rtc
 10:      70346          0   IO-APIC-fasteoi   sata_nv, ohci_hcd:usb2, nvidia
 11:      15006     104858   IO-APIC-fasteoi   sata_sil24, sata_nv, ehci_hcd:usb1, ndiswrapper
315:      64564          0   PCI-MSI-edge      eth2
316:       4433      61157   PCI-MSI-edge      eth1
NMI:          0          0   Non-maskable interrupts
LOC:     671033     670961   Local timer interrupts
RES:        518        853   Rescheduling interrupts
CAL:        111        234   function call interrupts
TLB:       2622       2840   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
SPU:          0          0   Spurious interrupts
ERR:          0


(I am using sys-apps/irqbalance)

Thanks.


Last edited by paulbiz on Sat Jan 26, 2008 7:11 pm; edited 1 time in total
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gentoo_ram
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Joined: 25 Oct 2007
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Location: San Diego, California USA

PostPosted: Sat Jan 26, 2008 6:40 am    Post subject: Reply with quote

You're concerned about which devices are sharing which IRQs? There really isn't anything you can do about it. What decides which devices are sharing is based on how they are wired on the motherboard. You can't "select" it. Are you really having any troubles? If not, don't worry about it. There's nothing you can do about it anyway. :D
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kimmie
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Joined: 08 Sep 2004
Posts: 531
Location: Australia

PostPosted: Sat Jan 26, 2008 7:51 am    Post subject: Reply with quote

Yep, except that if the devices aren't on the motherboard, ie. they're in expansion slots, changing the slot will usually change the IRQ. But like gentoo_ram says, don't worry about it unless you've got a problem.
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paulbiz
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Location: St. Louis, Missouri, USA

PostPosted: Sat Jan 26, 2008 7:04 pm    Post subject: Reply with quote

Okay, thanks. I figured that, but was curious to see if I was wrong. :) I had brief flashbacks to old DOS days, setting IRQ by dip switches, etc. Bad bad bad. :P
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