[mythtv-users] DMA problems again

[Craig Meyer]

1) Acpi and Apic are two different things. Apic is used primarly on newer
and SMP machines for the purpose of stearing extra IRQ's. It allows newer
computers to use over 16 IRQS and SMP machines to make intterupt requests
with both processors. ACPI is support for extra power extensions for
better power saving etc.... If your having a DMA problem, shut off APIC
and not ACPI.

2) Someone mentioned before in this thread that the 2.4 series kernel does
not have support for shutting off APIC durring the boot sequence. He is
mistaken, this is not just a 2.6 series option. I have been forced to use
that boot option on my BP6 SMP machine for over a year now with a 2.4
series kernel because otherwise the machine simply will not run Linux
correctly. I have never recompiled the kernel for this system. If you
can't find the command, write me personally and I will check my lilo.conf
for the correct append mesg (note: I think its noapic)

-Craig


> FYI,
>
> I have had major timing problems with kernel space programs when acpi is
> enabled. LIRC's modules were flaking out everytime a command was sent.
>
>
>
>
>
> Tony Maro <tony at maro.net>
> Sent by: mythtv-users-bounces at mythtv.org
> 01/12/2004 08:16 AM
> Please respond to
> Discussion about mythtv <mythtv-users at mythtv.org>
>
>
> To
> Discussion about mythtv <mythtv-users at mythtv.org>
> cc
>
> Subject
> Re: [mythtv-users] DMA problems again
>
>
>
>
>
>
> Torsten Schenkel wrote:
>> On Sun, 2004-01-11 at 22:11, Tony Maro wrote:
>>
>>
>>>The disable apic support suggestion is likely the correct answer.  You
>>>have two options, either recompile your kernel removing the "local APIC
>>>support" or disable it at boot with your boot manager.
>>
>>
>> You can disable APIC at boot time, to disable local APIC, which is most
>> likely to be causing problems, you have to recompile the kernel. Kernel
>> 2.6. has a boot time option, 2.4. hasn't.
>>
>>
>>>I googled this and found many different options suggested for boot time
>>>to disable APIC, so I just put them all into my line and these problems
>>>went away.
>>>
>>>in lilo.conf look for the kernel you are booting and make sure the
>>>following entries are in your "append" line:
>>>
>>>noapic nolapic pci=noacpi acpi=off
>>
>>
>> nolapic is a 2.6 kernel option, 2.4. will neglect it.
>
> I wasn't aware of that - again, it's just what I googled... ;-)
>
> So the "noapic" and/or noacpi entries fixed it for me.
>
> -Tony
>
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