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jlelli / sched-deadline-archive

An implementation of the popular Earliest Deadline First (EDF) scheduling algorithm or the Linux kernel. It is still experimental code, and it is still continuously being improved, but it already is a fully-working solution for supporting typical real-time applications in GNU/Linux environments.
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SCHED_DEADLINE will freeze the system on a kernel patched with PREEMP_RT #10

Closed facontidavide closed 10 years ago

facontidavide commented 10 years ago

The title says it all. I used rt-app to create a periodic task and my PC freezes completely when the kernel used is patched with PREEMPT_RT.

Any clues? Any suggestion about how I can debug this problem?

claudioscordino commented 10 years ago

How much bandwidth does the SCHED_DEADLINE taskset consume ? 100% ?

facontidavide commented 10 years ago

I launched it with 33%

rt-app -t 3000:1000:d

On Thu, Apr 24, 2014 at 12:35 PM, Claudio notifications@github.com wrote:

How much bandwidth does the SCHED_DEADLINE taskset consume ? 100% ?

Reply to this email directly or view it on GitHubhttps://github.com/jlelli/sched-deadline/issues/10#issuecomment-41265554 .

Davide Faconti

Icarus Technology SLU http://www.icarustechnology.com

NIF: B64096571

tel. +34666722156

Rbla de Catalunya 38, 8ª planta

08007, Barcelona, Spain

www.icarustechnology.com

claudioscordino commented 10 years ago

Which kernel are you using ? Any way of trying 3.14 ? (which already has SCHED_DEADLINE merged)

facontidavide commented 10 years ago

I am trying kernel 3.14... otherwise SCHED_DEADLINE won't be there ;)

The description of what I did can be found here: http://www.icarusrobotics.com/?p=1187 You will find debian packages to install yourself the kernel I am using on your Ubuntu machine (if you have one). But, in short, I used

On Thu, Apr 24, 2014 at 12:40 PM, Claudio notifications@github.com wrote:

Which kernel are you using ? Any way of trying 3.14 ? (which already has SCHED_DEADLINE merged)

— Reply to this email directly or view it on GitHubhttps://github.com/jlelli/sched-deadline/issues/10#issuecomment-41265960 .

Davide Faconti

Icarus Technology SLU http://www.icarustechnology.com

NIF: B64096571

tel. +34666722156

Rbla de Catalunya 38, 8ª planta

08007, Barcelona, Spain

www.icarustechnology.com

jlelli commented 10 years ago

Saw the same here. 3.14-rt1 has problems running SCHED_DEADLINE tasks (note that it is the first release on top of 3.14). It is not an rt-app problem, though. Hope to find out a solution soon.

Thanks!