Vulcano Test

Felix Frey <[email protected]> Thu, 31 Mar 2016 15:15:39 +0200
Newsgroups	gmane.linux.real-time.rtai
Message-ID	<[email protected]>
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

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