[Xenomai-help] Pool Size of RT queues

[Xenomai-help] Pool Size of RT queues

[Laurent.POYART]

Hi, 

I'm using xenomai 2.4-rc5 with a linux kernel 2.6.23. I have got a problem
with a simple test in which I try to create a RT queue using the native API:
 	RT_QUEUE theQueue;
	int err = rt_queue_create(&theQueue,"myRtQueue",2048,10,Q_FIFO); 
With the previous parameters, I get an error err=-EINVAL. I have
instrumented the xenomai code to find the problem.  rt_queue_create calls
the function xnheap_init_mapped with my poolsize of 2048 and with a
PAGE_SIZE of 4096. The xnheap_init_mapped function calls xnheap_init which
generates the EINVAL when running the following test (extrated from
ksrc/nucleus/heap.c): 
	if(hdrsize + 2 * pagesize > heapsize) return -EINVAL; 
I have extracted the values of the local variables: hdrsize=32, pagesize =
4096, heapsize = 8192. 
I succeed in creating the queue by using a big poolsize. I don't really
understand if there is a constraint when creating a queue or if I get the
error because of a bad configuration. I just find this strange to have to
create the queue with a big pool even if I just need a small one. 
Does anybody already encounter this kind of problem?

L.Poyart 

Re: [Xenomai-help] Pool Size of RT queues

[Philippe Gerum]

Laurent.POYART@fr.thalesgroup.com wrote:
> Hi, 
> 
> I'm using xenomai 2.4-rc5 with a linux kernel 2.6.23. I have got a problem
> with a simple test in which I try to create a RT queue using the native API:
>  	RT_QUEUE theQueue;
> 	int err = rt_queue_create(&theQueue,"myRtQueue",2048,10,Q_FIFO); 
> With the previous parameters, I get an error err=-EINVAL. I have
> instrumented the xenomai code to find the problem.  rt_queue_create calls
> the function xnheap_init_mapped with my poolsize of 2048 and with a
> PAGE_SIZE of 4096. The xnheap_init_mapped function calls xnheap_init which
> generates the EINVAL when running the following test (extrated from
> ksrc/nucleus/heap.c): 
> 	if(hdrsize + 2 * pagesize > heapsize) return -EINVAL; 
> I have extracted the values of the local variables: hdrsize=32, pagesize =
> 4096, heapsize = 8192. 
> I succeed in creating the queue by using a big poolsize. I don't really
> understand if there is a constraint when creating a queue or if I get the
> error because of a bad configuration. I just find this strange to have to
> create the queue with a big pool even if I just need a small one. 
> Does anybody already encounter this kind of problem?
>

Upgrade to 2.4.0.


> L.Poyart 
> 
> 
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> Xenomai-help mailing list
> Xenomai-help@domain.hid
> https://mail.gna.org/listinfo/xenomai-help
> 


-- 
Philippe.