Re: [Xenomai] 3.14.17 patch initial ram disk hangup

["Yogi A. Patel" <yapatel@gatech.edu>]

On 05/24/2015 03:01 AM, Jan Kiszka wrote:
> On 2015-05-22 22:47, Yogi A. Patel wrote:
>> Hi -
>>
>> I have a Dell OptiPlex 9020 running 3.14.17. I am trying to get this system to run 3.14.17 with xenomai (using the 3.14.17 patch in the xenomai 2.6.4 source).
>>
>> The computer hangs when I select the kernel at “Loading initial ram disk”. I tried booting into recovery mode and go the following output:
>>
>> Kernel panic - not syncing: timer doesn’t work through Interrupt-remapped IO-APIC.
> Please turn off CONFIG_IRQ_REMAP or boot the kernel with intremap=off.
> This feature is not yet compatible with I-pipe. I guess we should encode
> this into the x86 patch.
>
> Jan
>
>> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.14.17-xenomai-2.6.4.
>>
>> I’m having a hard time finding the source of the error. I’ve attached my config file. Any suggestions appreciated!
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>> Yogi
>>
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>

I tried Jan's suggestion and it works with the 3.14.17-x84-6 ipipe patch 
- I can boot in get to a desktop/etc. However, the latencies are all 
over the place. I am seeing worst-case latencies anywhere between 2us-50us.

I tried Gilles' suggestion, too - and compiled with 3.14.17-x86-9 ipipe 
patch. Same thing as above.

I read around online about interrupt remapping - and I can't seem to 
find anything that hints at why this turning it off would cause the 
latencies to be all over the place.

Any thoughts/guidance appreciated!

Yogi