RTAI, IRQ and harddrive

[Paolo Mantegazza]

Pierre Pomiers wrote:
> Gilles Chanteperdrix wrote:
> 
>> From your setup, your hard disk drive seems to be using some kind of
>> DMA, what happens if you use a PIO mode ?
>>  
>>
> How can I do that, from the boot option ? or with hdparm ?
> 
>> One more question: did you try disabling APM, ACPI, USB, etc...
>>  
>>
> APM and ACPI are disabled (as I already experienced strange thing with 
> them)... but for USB, I can't disable it as my Linux has to handle a 
> digital camera in background.
> 

That might be bad. Look at RTAI email archives, there should be a hint 
to disabling USB to avoid large latencies from my department.

Paolo.