[LITMUS^RT] domU crashes (RT-Xen)

[Sisu Xi]

Hi, Thijs:

For our paper, we installed 64bit Ubuntu 12.04 as Dom0, Xen version is 4.3
(on github).
For guest domain, we use Linux 3.0 with corresponding Litmus patch. It runs
ok without problem.

A quick way to test is switch to Xen default credit scheduler, and see if
the guest domain still crashes. If not, then it is RT-Xen's problem. Please
attach the xl dmesg information in this case.

Also, I noticed you are using rtspin for the workload. As I remembered,
rtspin would scale the workload. For example, if a VCPU with budget of 5
and period of 10, and you run a rtspin with wcet of 5 and period of 10.
When you use xentop to see the actual workload, it is 5/10 * 5/10 = 0.25.
In our experiment, we use the base_task.c provided by litmus.

Hope this helps.

Thanks.

Sisu


On Mon, Apr 28, 2014 at 7:56 AM, Thijs Raets <thijsraets at gmail.com> wrote:

> Hi,
>
> I'm running a virtual machine with 6 VCPU's with the following task set:
> ./rtspin 12 601 120 -w &
> ./rtspin 478 634 120 -w &
> ./rtspin 334 636 120 -w &
> ./rtspin 128 644 120 -w &
> ./rtspin 460 645 120 -w &
> ./rtspin 10 662 120 -w &
> ./rtspin 103 666 120 -w &
> ./rtspin 276 678 120 -w &
> ./rtspin 137 691 120 -w &
>
> When I release this task set, my system crashes. I calculated the MPR
> interface and 6 VCPUs should be enough. Also /dev/litmus/log does not give
> me any usable information. I would like to test my virtual machine for real
> time behavior, so it's ok if deadlines are missed, a crash however is
> unacceptable. Can anyone help (how can I avoid this behavior or what could
> be the problem)?
> Thanks in advance,
>
> Thijs
>
> _______________________________________________
> litmus-dev mailing list
> litmus-dev at lists.litmus-rt.org
> https://lists.litmus-rt.org/listinfo/litmus-dev
>
>


-- 


Sisu Xi, PhD Candidate

http://www.cse.wustl.edu/~xis/
Department of Computer Science and Engineering
Campus Box 1045
Washington University in St. Louis
One Brookings Drive
St. Louis, MO 63130
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