Re: Vulcano Test

Felix Frey <[email protected]>
Newsgroups gmane.linux.real-time.rtai
Message-ID <[email protected]> 
Updated CVS and test again.

So far, I get the same results.

When I put your calibration values (1715/2225) in my latencies file then
I get much more reasonable latency values:

RTAI Testsuite - USER latency (all data in nanoseconds)
2016/03/31 15:10:22
RTH| lat min| ovl min| lat avg| lat max| ovl max| overruns
RTD| 1110| 1110| 3643| 7019| 7019| 0
RTD| 2500| 1110| 3671| 5681| 7019| 0
RTD| 1749| 1110| 3664| 6475| 7019| 0
RTD| 1906| 1110| 3657| 6631| 7019| 0


Now I played with the period and time values. The latter one has no
influence, however, the effect of the period value is interesting
and not expected, I think:

Period=20000  ->  KernelLatency 4551, UserLatency 5104
Period=50000  ->  KernelLatency 4443, UserLatency 4760
Period=100000 ->  KernelLatency 4522, UserLatency 5042
Period=200000 ->  KernelLatency 20973, UserLatency 23225
Period=1000000 -> KernelLatency 35829, UserLatency 48231
Period=2000000 -> KernelLatency 87183, UserLatency 110500

Putting the values of the 1st line (4551/5104) into the latencies file
still produces negative latencies:

RTAI Testsuite - USER latency (all data in nanoseconds)
2016/03/31 15:42:22
RTH| lat min| ovl min| lat avg| lat max| ovl max| overruns
RTD| -1468| -1468| 781| 3692| 3692| 0
RTD| -1362| -1468| 769| 2432| 3692| 0
RTD| -1529| -1529| 777| 3602| 3692| 0
RTD| -1398| -1529| 765| 3000| 3692| 0


By the way, when I changed the time value to 5s, the output remains like
this (TIME is wrong):

AFTER USER CALIBRATION (ns): KernelLatency 4568, UserLatency 5060
(CALIBRATION: PERIOD 100000 (ns), TIME 1015577174 (ns)).


attached my rtai_config.h

Felix


Am 31.03.2016 um 15:39 schrieb Paolo Mantegazza:
> That's (calibration) something really strange. Just wondering why on a
> machine like yours I get:
> SYSINFO - # CPUs: 2, TIMER NAME: 'lapic', TIMER IRQ: 2305, TIMER FREQ:
> 8308369,
> CLOCK NAME: 'tsc', CLOCK FREQ: 997204000, CPU FREQ: 997204000, LINUX
> TIMER IRQ:
> 2305.
> RTAI[malloc]: global heap size = 2097152 bytes, <TLSF>.
> , kstacks pool size = 524288 bytes.
> RTAI[sched]: hard timer type/freq = lapic/8308369(Hz); timing: oneshot;
> black/red timed lists.
> RTAI[sched]: Linux timer freq = 1000 (Hz), TimeBase freq = 997204000 hz.
> RTAI[sched]: timer setup = 120 ns, resched latency = 0 ns.
> RTAI[usi]: enabled.
> USERMODE CHECK: OK.
> USERMODE CHECK PROVIDED (ns): KernelLatency -1, UserLatency -1.
> AFTER KERNEL CALIBRATION (WITH RTAI TASK, ns): KernelLatency 1715,
> UserLatency -1 (CALIBRATION: PERIOD 100000 (ns), TIME 1009367042 (ns)).
> USERMODE USER SPACE CALIBRATION: OK.
> AFTER USER CALIBRATION (ns): KernelLatency 1715, UserLatency 2225
> (CALIBRATION:
> vi list    PERIOD 100000 (ns), TIME 1014464466 (ns)).
> FINAL CALIBRATION SUMMARY (ns): KernelLatency 1715, UserLatency 2225.
> 
> with
> 
> RTAI Testsuite - USER latency (all data in nanoseconds)
> 2016/03/31 15:32:32
> RTH|    lat min|    ovl min|    lat avg|    lat max|    ovl max| overruns
> RTD|        121|        121|        609|       6424| 6424|          0
> RTD|        434|        121|        548|       3984| 6424|          0
> ^CRTD|        434|        121|        548|       3984| 6424|          0
> 
>>>> S = 98.696, EXECTIME = 0.0325566
> 
> Since I've consistent results on two other machines, up to 3.3 GHz, I'm
> let asking you to help me in seeing what goes wrong.
> In such a view edits "latencies" file, found in subdir calibrate of your
> installation directory, putting my figures above in it and checking what
> you get with the test.
> Then you can play configuring with the period and calibration duration
> to see if they provide a change, and report the outcomes.
> BTW, send me the rtai_config.h that produced those results.
> 
> Paolo
> 
> On 03/31/2016 03:15 PM, Felix Frey wrote:
>> Just tested vulcano CVS with kernel 4.1.18
>> (on AMD GX-210, x86_64, 2 cores)
>>
>> Running userspace latency test gives:
>>
>> RTAI Testsuite - USER latency (all data in nanoseconds)
>> 2016/03/31 14:02:43
>> RTH| lat min| ovl min| lat avg| lat max| ovl max| overruns
>> RTD| -19935| -19935| -18063| -14615| -14615| 0
>> RTD| -19723| -19935| -18050| -15267| -14615| 0
>> RTD| -19514| -19935| -18060| -15083| -14615| 0
>> RTD| -20177| -20177| -18063| -15137| -14615| 0
>> RTD| -19828| -20177| -18060| -15116| -14615| 0
>>
>> These are the kernel messages:
>>
>> [ 1319.188664] RTAI[hal]: mounted. ISOL_CPUS_MASK: 0, LINUX CPU ISOLATED
>> MAP: ffffffff81e61c20).
>> [ 1319.197214] SYSINFO - # CPUs: 2, TIMER NAME: 'lapic', TIMER IRQ:
>> 4353, TIMER FREQ: 6238209, CLOCK NAME: 'tsc', CLOCK FREQ: 998088000, CP
>> U FREQ: 998088000, LINUX TIMER IRQ: 4353.
>> [ 1319.248508] RTAI[malloc]: global heap size = 2097152 bytes, <BSD>.
>> [ 1319.254814] , kstacks pool size = 524288 bytes.
>> [ 1319.259457] RTAI[sched]: hard timer type/freq = lapic/6238209(Hz);
>> timing: oneshot; linear timed lists.
>> [ 1319.268913] RTAI[sched]: Linux timer freq = 250 (Hz), TimeBase freq =
>> 998088000 hz.
>> [ 1319.276593] RTAI[sched]: timer setup = 160 ns, resched latency = 0 ns.
>> [ 1319.284973] USERMODE CHECK: OK.
>> [ 1319.288155] USERMODE CHECK PROVIDED (ns): KernelLatency -1,
>> UserLatency -1.
>> [ 1320.331572] AFTER KERNEL CALIBRATION (WITH RTAI TASK, ns):
>> KernelLatency 21009, UserLatency -1 (CALIBRATION: PERIOD 200000 (ns),
>> TIME 10
>> 36380956 (ns)).
>> [ 1321.362282] USERMODE USER SPACE CALIBRATION: OK.
>> [ 1321.366937] AFTER USER CALIBRATION (ns): KernelLatency 21009,
>> UserLatency 23941 (CALIBRATION: PERIOD 200000 (ns), TIME 1021744803
>> (ns)).
>> [ 1321.379211] FINAL CALIBRATION SUMMARY (ns): KernelLatency 21009,
>> UserLatency 23941.
>> [ 1334.500839] RTAI[malloc]: unloaded.
>> [ 1334.600674] RTAI[sched]: unloaded (forced hard/soft/hard transitions:
>> traps 0, syscalls 0).
>> [ 1334.623217] I-pipe: head domain RTAI unregistered.
>> [ 1334.628084] RTAI[hal]: unmounted.
>>
>>
>> The latency values are probably not what they are expected to.
>> In my opinion the calibration delivers much too high values
>> (21009/23941).
>> Any ideas??
>>
>> Felix
>>
>> _______________________________________________
>> Rtai mailing list
>> [email protected]
>> https://mail.rtai.org/cgi-bin/mailman/listinfo/rtai
> 
> _______________________________________________
> Rtai mailing list
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> https://mail.rtai.org/cgi-bin/mailman/listinfo/rtai
>

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