2.6.21-rt9 problem : xruns

2.6.21-rt9 problem : xruns

[skyball000]

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@e0000000 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

Re: 2.6.21-rt9 problem : xruns

[Guennadi Liakhovetski]

On Fri, 29 Jun 2007 skyball000@freesurf.fr wrote:

> 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.

Interestingly, this looks very similar to a problem I had... Could you, 
please, verify if acpid is running (with ACPI configured on), and if yes - 
stop it and retest for xruns?

Thanks
Guennadi

> Moreover, I get this message at boot time :
> PCI: BIOS bug: MCFG area@e0000000 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
> 
> 
> 
> 
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

---
Guennadi Liakhovetski

Re: 2.6.21-rt9 problem : xruns

[skyball000]

> On Fri, 29 Jun 2007 skyball000@freesurf.fr wrote:
>
>> 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.
>
> Interestingly, this looks very similar to a problem I had... Could you,
>  please, verify if acpid is running (with ACPI configured on), and if
> yes -  stop it and retest for xruns?
>
> Thanks
> Guennadi
>
I've only seen a "kacpid" (unkillable), managed to stop ACPI services with
init scripts but xruns are still there (a few less).

>> Moreover, I get this message at boot time :
>> PCI: BIOS bug: MCFG area@e0000000 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
>>
>>
>>
>>
>>
>> -
>> To unsubscribe from this list: send the line "unsubscribe
>> linux-kernel" in the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at  http://www.tux.org/lkml/
>>
>
> ---
> Guennadi Liakhovetski