WinXP PCI IRQs different than Bios PCI IRQs

[labdog]

Hi all,

I have a problem with the Windows XP PCI IRQs.
they are almost all set to IRQ 9 in Windows XP.
That seems to me very strange & some non sens but despite of my system works fine.

Here is my PCI Listing IRQs from the Bios when booting & in Windows XP:

<b>------------------------- BIOS ---- WINDOWS XP</b>
IDE controller ------------ 14/15 -------- 14/15
Serial bus controller ------ 9 ------------ <b>9</b>
Multimedia device -------- 9 ------------ <b>9</b> (sb Live!)
Input device ------------- NA ----------- 12
Mass storage controller --- 5 ------------ <b>9</b> (Adaptec 2940 UW)
Mass storage controller --- 10 ----------- <b>9</b> (onboard Promise raid)
Display controller --------- 11 ----------- <b>9</b> (AIW Radeon)


My ring is:

<i>Asus A7v133 Raid
TB 1.333@1.533
Infineon CAS2 256Mb
IBM 60GXP
AIW Radeon AGP
sb Live!
Adaptec 2940 UW</i>


thanks all who know something about this problem.



if you know you don't know, the way could be more easy.

 

[Toejam31]

It's not a problem; it's a feature!

<A HREF="http://www.microsoft.com/windowsxp/home/using/productdoc/en/default.asp?url=/WINDOWSXP/home/using/productdoc/en/pnp_acpi.asp" target="_new">Using Plug and Play with ACPI hardware</A>

<A HREF="http://support.microsoft.com/default.aspx?scid=kb;EN-US;q252420" target="_new">General Description of IRQ Sharing in Windows</A>

The second link is also applicable for WinXP.

Toejam31

<font color=red>My Rig:</font color=red> <A HREF="http://www.anandtech.com/mysystemrig.html?rigid=6847" target="_new"><font color=green>Toejam31's Tantalizing Tantric Toy</font color=green></A>
____________________________________________________________

<font color=purple>"Procrastination on your part does not constitute an emergency on my part."</font color=purple>

 

[labdog]

<blockquote><font size=1>En réponse à:</font><hr><p>In Windows, some or all of the devices on your ACPI motherboard may be listed when you view the resources in Device Manager as using the same IRQ (IRQ 9) (to view the list of resources click either Resources by type , or Resources by connection on the View menu). You cannot change the IRQ setting because the setting is unavailable. This occurs because Windows takes advantage of the ACPI features of the motherboard, including advanced PCI sharing. IRQ 9 is used by the PCI bus for IRQ steering. This feature lets you add more devices without generating IRQ conflicts.<p><hr></blockquote><p>ok, thanks.


if you know you don't know, the way could be more easy.

 

[labdog]

<blockquote><font size=1>En réponse à:</font><hr><p>In Windows, some or all of the devices on your ACPI motherboard may be listed when you view the resources in Device Manager as using the same IRQ (IRQ 9) (to view the list of resources click either Resources by type , or Resources by connection on the View menu). You cannot change the IRQ setting because the setting is unavailable. This occurs because Windows takes advantage of the ACPI features of the motherboard, including advanced PCI sharing. IRQ 9 is used by the PCI bus for IRQ steering. This feature lets you add more devices without generating IRQ conflicts.<p><hr></blockquote><p>ok, thanks.



if you know you don't know, the way could be more easy.

 

[labdog]

<A HREF="http://www.microsoft.com/windowsxp/home/using/productdoc/en/default.asp?url=/WINDOWSXP/home/using/productdoc/en/pnp_acpi.asp" target="_new">http://www.microsoft.com/windowsxp/home/using/productdoc/en/default.asp?url=/WINDOWSXP/home/using/productdoc/en/pnp_acpi.asp</A>

<A HREF="http://support.microsoft.com/default.aspx?scid=kb;EN-US;q252420" target="_new">http://support.microsoft.com/default.aspx?scid=kb;EN-US;q252420</A>

if you know you don't know, the way could be more easy.

 

[labdog]

<blockquote><font size=1>En réponse à:</font><hr><p>ACPI IRQS Steering to IRQ 9<p><hr></blockquote><p>but is this mechanism involve a decrease in terms of performances ?

there is a method to bypass ACPI, is to disable it in the Bios.

with this method, can we increase WinXP performances ?

in other words is ACPI has an impact on the WinXP performances ?

What do you think about ?

thanks.



if you know you don't know, the way could be more easy.

 

[Toejam31]

I have not seen any evidence that there is a decrease in the performance level of any kind of hardware or software with ACPI handling the system resources, or because advanced PCI sharing is enabled. In fact, I am under the impression that the reverse is true.

<A HREF="http://www.intel.com/ebusiness/products/mobile/initiatives/ar420.htm" target="_new">ACPI OS- Benefits to Users</A>

The virtual elimination of IRQ conflicts with ACPI makes Plug and Play a workable feature since it was first introduced to consumers, and that in itself is an excellent reason to avoid using a Standard HAL, as long as your hardware is ACPI-compatible.

Microsoft highly recommends against disabling ACPI except for those situations in which you have no other choice.

You mentioned that your system is working fine. Then, IMHO, you have absolutely nothing to worry about, in terms of performance, or otherwise.

Toejam31

<font color=red>My Rig:</font color=red> <A HREF="http://www.anandtech.com/mysystemrig.html?rigid=6847" target="_new"><font color=green>Toejam31's Tantalizing Tantric Toy</font color=green></A>
____________________________________________________________

<font color=purple>"Procrastination on your part does not constitute an emergency on my part."</font color=purple>