bad sharing IRQ

Alexander Apprich a.apprich at science-computing.de
Thu Sep 9 08:15:32 UTC 2004


Hi Roberto,

Roberto Felloni wrote:
> Hi to all, 
> Hi Alexander, and sorry for my delay 
> (some hardware problems).

No problem, most of us have been there too ;-)

> 
> On Mon, 06 Sep 2004 14:46:59 +0200, Alexander Apprich
> <a.apprich at science-computing.de> wrote:
> 
>>Hi Roberto,
>>
>>Roberto Felloni wrote:
>>
>>>Hi to all user.
>>>I newbye for this list and for Linux World's too.
>>>
>>
>>Welcome!
>>
>>
>>>My recent upgrade of RedHat 7.3 on Fedore Core 2 have some problems.
>>
>>Did you really upgrade, or a clean install?
>>
> 
> 
> You are right!
> Is not an update, but a new installation to cover older RH7.3;
> is an installation type server (for my future domestic network).
> 
> 
>>>The first and more important is a problem of sharing of the same IRQ
>>>from eth0 and sound card.
>>>
>>
>>Do you really have to share an IRQ for sound and eth0?
>>
> 
> 
> Yes, I think so.
> 
> 
>>>(I prefer to use shell for my operation, not GUI)
>>>Someone, kindly, can advise me where and what file of configuration I
>>>do modify ?
>>>... and what kind of modification I must do ?
>>>
>>
>>What is the ouput of (as root)
>>
>>   /sbin/lspci -v
> 
> 
> is this:
> ---------------------------------------------------------------------------------------------------
> 00:00.0 Host bridge: VIA Technologies, Inc. VT82C693A/694x [Apollo
> PRO133x] (rev 02)
> 	Subsystem: Asustek Computer, Inc.: Unknown device 8023
> 	Flags: bus master, medium devsel, latency 0
> 	Memory at e4000000 (32-bit, prefetchable)
> 	Capabilities: [a0] AGP version 2.0
> 
> 00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo
> MVP3/Pro133x AGP] (prog-if 00 [Normal decode])
> 	Flags: bus master, 66Mhz, medium devsel, latency 0
> 	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
> 	Capabilities: [80] Power Management version 2
> 
> 00:04.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super
> South] (rev 22)
> 	Subsystem: Asustek Computer, Inc.: Unknown device 8023
> 	Flags: bus master, stepping, medium devsel, latency 0
> 
> 00:04.1 IDE interface: VIA Technologies, Inc.
> VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 10)
> (prog-if 8a [Master SecP PriP])
> 	Flags: bus master, stepping, medium devsel, latency 32
> 	I/O ports at d800 [size=16]
> 	Capabilities: [c0] Power Management version 2
> 
> 00:04.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
> Controller (rev 10) (prog-if 00 [UHCI])
> 	Subsystem: VIA Technologies, Inc. (Wrong ID) USB Controller
> 	Flags: bus master, medium devsel, latency 32, IRQ 9
> 	I/O ports at d400 [size=32]
> 	Capabilities: [80] Power Management version 2
> 
> 00:04.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
> Controller (rev 10) (prog-if 00 [UHCI])
> 	Subsystem: VIA Technologies, Inc. (Wrong ID) USB Controller
> 	Flags: bus master, medium devsel, latency 32, IRQ 9
> 	I/O ports at d000 [size=32]
> 	Capabilities: [80] Power Management version 2
> 
> 00:04.4 Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super
> ACPI] (rev 30)
> 	Flags: medium devsel, IRQ 9
> 	Capabilities: [68] Power Management version 2
> 
> 00:04.5 Multimedia audio controller: VIA Technologies, Inc. VT82C686
> AC97 Audio Controller (rev 20)
> 	Flags: medium devsel, IRQ 10
---->                        ^^^^^^^
> 	I/O ports at b800
> 	I/O ports at b400 [size=4]
> 	I/O ports at b000 [size=4]
> 	Capabilities: [c0] Power Management version 2
> 
> 00:0c.0 VGA compatible controller: S3 Inc. ViRGE/DX or /GX (rev 01)
> (prog-if 00 [VGA])
> 	Subsystem: S3 Inc. ViRGE/DX
> 	Flags: bus master, medium devsel, latency 32, IRQ 11
> 	Memory at dc000000 (32-bit, non-prefetchable) [size=768K]
> 	Expansion ROM at 00010000 [disabled]
> 
> 00:0d.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL-8139/8139C/8139C+ (rev 10)
> 	Subsystem: Realtek Semiconductor Co., Ltd. RT8139
> 	Flags: bus master, medium devsel, latency 32, IRQ 9
----->                                                ^^^^^^
> 	I/O ports at a400
> 	Memory at db800000 (32-bit, non-prefetchable) [size=256]
> 	Capabilities: [50] Power Management version 2
> ---------------------------------------------------------------------------------------------------
> 


Okay, here we go.

Your soundcard (Multimedia audio controller: VIA Technologies, Inc.
VT82C686 AC97 Audio) uses IRQ10, and you network card (Ethernet
controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+)
uses IRQ9.

So now I'm wondering where exactly your problem is?! Does one of these
not work?

This is a snip of an /sbin/lspci -v on my system, and I have these
3 components all using the same IRQ. Never had an problem with that.

00:0d.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] 
(rev 0c)
         Subsystem: Intel Corp. EtherExpress PRO/100 S Desktop Adapter
         Flags: bus master, medium devsel, latency 32, IRQ 11

00:11.1 IDE interface: VIA Technologies, Inc. VT82C586/B/686A/B PIPC Bus 
Master IDE (rev 06) (prog-if 8a [Master SecP PriP])
         Subsystem: Asustek Computer, Inc. VT8233A Bus Master 
ATA100/66/33 IDE
         Flags: bus master, stepping, medium devsel, latency 32, IRQ 11

01:00.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4 MX 
440] (rev a3) (prog-if 00 [VGA])
         Subsystem: Micro-Star International Co., Ltd.: Unknown device 8470
         Flags: bus master, 66Mhz, medium devsel, latency 248, IRQ 11


>>
>>>(sorry for my english)
>>>Thank's in advantage
>>>
>>>bye by roberto
>>>
>>>
>>
>>Alex
>>
> 
>  
> Many thank's for your interest.
> bye

Alex
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