linux-kernel - 2.6.21-rt9 problem : xruns

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Date:	Fri, 29 Jun 2007 13:24:56 +0200 (CEST)
From:	<skyball000@...esurf.fr>
To:	<linux-kernel@...r.kernel.org>
Subject: 2.6.21-rt9 problem : xruns

Hi,

I've recently compiled a "vanilla" 2.6.21 kernel, patched with Ingo Molnar's
rt-8 patch, as I was unable to compile with rt-7.

I needed it because I'm using audio applications (tests were made with
FrugalWare, but I don't think it's a distro issue).

Everything was allright until I changed my motherboard for an  Asrock
4coreDual-Vsta (I formerly used a Nforce4 one), with VIA PT880 Ultra chipset.

I've justed switched the hardware, as Linux is neat enough to boot without
having to reinstall the whole OS.

Since, I get tons of xruns when using RT applications, and the only solution
I've found to "fix" it was to disable ACPI at boot time.
Moreover, I get this message at boot time :
PCI: BIOS bug: MCFG area@...00000 is not E820 reserved
PCI: not using MMCONFIG

I've also tested this hardware setup with a UbuntoStudio kernel (2.6.19),
and everything works flawlessy (no XRUNS, no kernel messages) !

So here is my question (I'd like to understand what's happening) :
   - is it a kernel (or patch) issue ?
   - is it a bad chipset support in the latest kernel versions ?
   - could this be related to BIOS issues only (I've tried all available
versions without any change) ?
   - should I use special settings in the ".config" in order to avoid these
problems ?

I wasn't able to detect what causes these XRUNS, so if anyone has clues ...

Regards
skb

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