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Date: Thu, 07 Aug 2014 21:44:18 +0200
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai] real-time guarantee issues on xenomai 2.6.2.1
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To: Ludovic Righetti <ludovic.righetti@tuebingen.mpg.de>, Paul Janzen <pcj@xenomai.sez.to>, xenomai@xenomai.org

On 08/07/2014 09:35 PM, Ludovic Righetti wrote:
> 
>> I suspect you could run any loop, like cat /proc/interrupts, and see the
>> same issue. Are you running with a frame buffer in the no-x mode?
>>
> that's what I thought too, but /proc/interrupts or /proc/xenomai/sched
> (or others) do not seem to create any issue (below the output for
> interrupts, watching other /proc/ files give similar results).
> 
> Let me check about the fb.
> 

Just for kicks, could you try this patch ? it does NOT fix anything,
only maybe papering over an issue we don't know about yet:

diff --git a/ksrc/nucleus/sched.c b/ksrc/nucleus/sched.c
index 3391f4a..16d96d3 100644
--- a/ksrc/nucleus/sched.c
+++ b/ksrc/nucleus/sched.c
@@ -877,7 +877,7 @@ static int vfile_stat_next(struct
xnvfile_snapshot_iterator *it, void *data)
 		 * We are done with actual threads, scan interrupt
 		 * descriptors.
 		 */
-		goto scan_irqs;
+		return 0;

 	thread = link2thread(priv->curr, glink);
 	priv->curr = nextq(&nkpod->threadq, priv->curr);

> ludovic
> 
> 
> 
> 
> RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat
> best|--lat worst
> RTD|     -2.322|     -1.053|      7.677|       0|     0|    
> -2.322|      7.677
> RTD|     -2.321|     -1.062|      8.224|       0|     0|    
> -2.322|      8.224
> RTD|     -2.322|     -1.058|      7.195|       0|     0|    
> -2.322|      8.224
> RTD|     -2.320|     -1.050|      7.070|       0|     0|    
> -2.322|      8.224
> RTD|     -2.321|     -1.056|      7.389|       0|     0|    
> -2.322|      8.224
> RTD|     -2.323|     -1.060|      6.365|       0|     0|    
> -2.323|      8.224
> RTD|     -2.320|     -1.050|      8.547|       0|     0|    
> -2.323|      8.547
> RTD|     -2.320|     -1.051|      8.097|       0|     0|    
> -2.323|      8.547
> RTD|     -2.320|     -1.062|      7.406|       0|     0|    
> -2.323|      8.547
> RTD|     -2.321|     -1.054|      9.558|       0|     0|    
> -2.323|      9.558
> RTD|     -2.321|     -1.061|      6.994|       0|     0|    
> -2.323|      9.558
> RTD|     -2.321|     -1.064|      5.545|       0|     0|    
> -2.323|      9.558
> 


-- 
Philippe.