Re: userspace latency test hang on rtai4.0

Hard periodic mode timing has to be forgotten with Linux 3.x onward.
To avoid problems like yours in the new 5.0 version, i.e. the actual 
Vulcano CVS,  the related functions are kept for compatibility but are 
voided.

Paolo

On 04/21/2016 08:41 AM, Neeraj Agrawal wrote:
>
> Hi,
>
> Setup Env:
>
> -rtai4.0 (on x86)
>
> -Linux version 3.8.13
>
> -[ 1371.585504] SYSINFO: CPUs 4, LINUX APIC IRQ 4352, TIM_FREQ 
> 6234609, CLK_FREQ 2893274000, CPU_FREQ 2893274000
>
> -[ 1371.586653] RTAI_APIC_TIMER_IPI: RTAI DEFINED 4354, VECTOR 4354; 
> LINUX_APIC_TIMER_IPI: RTAI DEFINED 4352, VECTOR 4352
>
> -CONFIG_RTAI_TSC is true
>
> Experiment :
>
> Default usermode latency test runs fine ($./run)
>
> However on setting ‘TIMER_MODE’ to 1 (in latency.c) get a hang.
>
> On further debugging and running only $./latency, I could see that 
> hang is coming from :-
>
> rt_task_make_periodic(task, expected = rt_get_tscnt() + 10*period, 
> period);
>
> On replacing rt_get_tscnt with rt_get_time in the above line, there is 
> no hang.
>
> I could not explain this, as rt_get_tscnt does not lead to hang when 
> ‘TIMER_MODE’ is 0.
>
> Regards
>
> Neeraj
>
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