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PostPosted: Wed May 03, 2006 10:28 pm 
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Joined: Tue Jan 18, 2005 2:07 am
Posts: 1532
Location: California
When I look in /proc/interupt I see that my Nvida FX5200 card has been assigned to IRQ 11. When I look in /proc/pci I see that both the FX5200 card and the IDE controller have been assigned to IRQ 11. Will this sharing of the IRQ cause any stability or performance problems? Also, is there a reason that the use if IRQ 11 for the IDE controller only shows up in /proc/pci, and not in /proc/interupts?

I cannot seem to find any way to get them on separate IRQs. When i disabled IRQ 11 in the bios, they both moved to IRQ10. Thanks for any insights you can provide.

Marc

Code:
root@mythhd:/proc# cat interrupts
           CPU0       CPU1
  0:      32062          0          XT-PIC  timer
  1:         10          0          XT-PIC  i8042
  2:          0          0          XT-PIC  cascade
  5:          0          0          XT-PIC  ivtv0
  7:         90          0          XT-PIC  ohci1394
  8:          1          0          XT-PIC  rtc
 10:        627          0          XT-PIC  eth0, EMU10K1
 11:       4712          0          XT-PIC  nvidia
 12:        102          0          XT-PIC  i8042
 14:       9028          0          XT-PIC  ide0
 15:        133          0          XT-PIC  ide1
NMI:          0          0
LOC:      32009      32008
ERR:          0
MIS:          0


Code:
root@mythhd:/proc# cat pci
PCI devices found:
  Bus  0, device   0, function  0:
    Host bridge: Silicon Integrated Systems [SiS] SiS 645xx (rev 81).
      Master Capable.  Latency=32.
      Non-prefetchable 32 bit memory at 0xd8000000 [0xdbffffff].
  Bus  0, device   1, function  0:
    PCI bridge: PCI device 1039:0003 (Silicon Integrated Systems [SiS]) (rev 0).
      Master Capable.  Latency=64.  Min Gnt=14.
  Bus  0, device   2, function  0:
    ISA bridge: Silicon Integrated Systems [SiS] SiS85C503/5513 (LPC Bridge) (rev 37).
  Bus  0, device   2, function  1:
    SMBus: Silicon Integrated Systems [SiS] SiS961/2 SMBus Controller (rev 0).
      I/O at 0x10c0 [0x10df].
  Bus  0, device   2, function  5:
    IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev 0).
      IRQ 11.
      Master Capable.  Latency=128.
      I/O at 0x4000 [0x400f].
  Bus  0, device   4, function  0:
    Ethernet controller: Silicon Integrated Systems [SiS] SiS900 PCI Fast Ethernet (rev 145).
      IRQ 10.
      Master Capable.  Latency=32.  Min Gnt=52.Max Lat=11.
      I/O at 0xe400 [0xe4ff].
      Non-prefetchable 32 bit memory at 0xe2024000 [0xe2024fff].
  Bus  0, device  10, function  0:
    FireWire (IEEE 1394): Texas Instruments TSB12LV23 IEEE-1394 Controller (rev 0).
      IRQ 7.
      Master Capable.  Latency=64.  Min Gnt=3.Max Lat=4.
      Non-prefetchable 32 bit memory at 0xe2026000 [0xe20267ff].
      Non-prefetchable 32 bit memory at 0xe2020000 [0xe2023fff].
  Bus  0, device  11, function  0:
    Multimedia video controller: Internext Compression Inc iTVC16 (CX23416) MPEG-2 Encoder (rev 1).
      IRQ 5.
      Master Capable.  Latency=64.  Min Gnt=128.Max Lat=8.
      Prefetchable 32 bit memory at 0xdc000000 [0xdfffffff].
  Bus  0, device  13, function  0:
    Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 7).
      IRQ 10.
      Master Capable.  Latency=32.  Min Gnt=2.Max Lat=20.
      I/O at 0xe800 [0xe81f].
  Bus  0, device  13, function  1:
    Input device controller: Creative Labs SB Live! MIDI/Game Port (rev 7).
      Master Capable.  Latency=32.
      I/O at 0xec00 [0xec07].
  Bus  1, device   0, function  0:
    VGA compatible controller: nVidia Corporation NV34 [GeForce FX 5200] (rev 161).
      IRQ 11.
      Master Capable.  Latency=248.  Min Gnt=5.Max Lat=1.
      Non-prefetchable 32 bit memory at 0xe0000000 [0xe0ffffff].
      Prefetchable 32 bit memory at 0xd0000000 [0xd7ffffff].


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 Post subject: IRQ 18
PostPosted: Wed May 26, 2010 2:57 am 
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Joined: Mon Dec 18, 2006 1:20 pm
Posts: 98
Location: Krakow, Poland, EU
Hi,

Same question regarding Ethernet adapter, AC'97 sound card, and DVB capture card, all sticking on the very same IRQ 18, when there is plenty of free IRQs elsewhere (from 0 to 23 with an APIC chipset, I guess).

As it did not for you, tuning the BIOS did not changed anything for me neither. Tried to assign IRQ #10 to PCI slot where DVB card is plugged; the card stays glued to IRQ 18. Toggled that BIOS option plug-and-play OS had just no effect.

Here is lspci -vnn output:
Code:
00:02.7 Multimedia audio controller [0401]: Silicon Integrated Systems [SiS] AC'97 Sound Controller [1039:7012] (rev a0)
   Subsystem: ASUSTeK Computer Inc. Device [1043:8095]
   Flags: bus master, medium devsel, latency 32, IRQ 18
   I/O ports at 9400 [size=256]
   I/O ports at 9000 [size=128]
   Capabilities: [48] Power Management version 2
   Kernel driver in use: Intel ICH
   Kernel modules: snd-intel8x0

00:0f.0 Ethernet controller [0200]: Broadcom Corporation BCM4401 100Base-T [14e4:4401] (rev 01)
   Subsystem: ASUSTeK Computer Inc. A7V8X motherboard [1043:80a8]
   Flags: bus master, fast devsel, latency 32, IRQ 18
   Memory at e0000000 (32-bit, non-prefetchable) [size=8K]
   Capabilities: [40] Power Management version 2
   Kernel driver in use: b44

00:13.0 Multimedia controller [0480]: Philips Semiconductors SAA7146 [1131:7146] (rev 01)
   Subsystem: KNC One Device [1894:003a]
   Flags: bus master, medium devsel, latency 32, IRQ 18
   Memory at df800000 (32-bit, non-prefetchable) [size=512]
   Kernel driver in use: budget_av
   Kernel modules: snd-aw2, budget-av

According to a few comments floating around, IRQ sharing over PCI bus should have no consequence, if PCI cards have been correctly designed. In case of design flaw, cards' signalisation may interfere when sharing the same IRQ. It means: no valid answer at our level. :cry:

I found your may '06 post by chance; I am not used to deter old thread; but this bump by 4 years is a quite nice one. :wink:


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