Re: [LAU] HW upgrade - new computer

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To: Len Ovens <len@...>
Cc: linux-audio-user <linux-audio-user@...>
Date: Thursday, May 1, 2014 - 7:53 am

Len Ovens wrote:

Device 00:1c.3 is one of the PCIe ports of the southbridge.
Device 04:00 is the ASM1083 PCIe/PCI bridge.
Devices 05:xx are the chips on the PCI cards.

Bus 00: is the "root complex", i.e., CPU/northbridge/southbridge.
Bus 04: is the PCIe connection between the southbridge and the ASM1083.
Bus 05: is the PCI bus.

"[04-05]" means that both buses are reachable through this bridge.

> So it sounds like you are saying that the PCIe devices are assigned

There are different kinds of interrupts. 0-15 are ISA-compatible
interrupts; the next four or eight can be used for PCI interrupts.
(The interrupt controller (IOAPIC) has only a limited number of
interrupt lines.)

Message-signaled interrupts (MSIs) are implemented with a different
mechanism and do not need to go through the IOAPIC; you can have any
number of them, and they are never shared between devices.

> Looking at /proc/interrupts, I see that ahci (which from lspci seems

Yes, it's an MSI.

> (and why do I have an ISA bridge?)

Because you have ISA devices. (Intel likes to call them "legacy", but
they are still there.)

> I would guess that if I installed a PCIe card that was PCI HW with

Yes.

Regards,
Clemens
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Messages in current thread:
[LAU] HW upgrade - new computer, Len Ovens, (Mon Apr 28, 4:31 am)
Re: [LAU] HW upgrade - new computer, Ivan K, (Mon Apr 28, 12:59 pm)
Re: [LAU] HW upgrade - new computer, Len Ovens, (Mon Apr 28, 9:26 pm)
Re: [LAU] HW upgrade - new computer, Clemens Ladisch, (Mon Apr 28, 7:52 am)
Re: [LAU] HW upgrade - new computer, Len Ovens, (Mon Apr 28, 9:04 pm)
Re: [LAU] HW upgrade - new computer, Clemens Ladisch, (Wed Apr 30, 8:23 am)
Re: [LAU] HW upgrade - new computer, Len Ovens, (Wed Apr 30, 11:49 pm)
Re: [LAU] HW upgrade - new computer, Clemens Ladisch, (Thu May 1, 7:53 am)
Re: [LAU] HW upgrade - new computer, Kevin Cosgrove, (Mon Apr 28, 5:47 pm)
Re: [LAU] HW upgrade - new computer, Gene Heskett, (Mon Apr 28, 11:17 am)
Re: [LAU] HW upgrade - new computer, Raphaƫl Mouneyres, (Mon Apr 28, 7:29 am)
Re: [LAU] HW upgrade - new computer, Len Ovens, (Mon Apr 28, 8:55 pm)
Re: [LAU] HW upgrade - new computer, Kevin Cosgrove, (Mon Apr 28, 8:58 pm)
Re: [LAU] HW upgrade - new computer, Len Ovens, (Tue Apr 29, 12:26 am)
Re: [LAU] HW upgrade - new computer, Joe Hartley, (Mon Apr 28, 12:04 pm)
Re: [LAU] HW upgrade - new computer, Len Ovens, (Mon Apr 28, 9:09 pm)