> But more importantly, since, the time when we print the result is so > imprecise, some variations are normal, so, chances are that the 2% > variation is normal. >
Ok. Here is a switchtest with Xenomai 2.4.9 on PPC-Kernel 2.4.25 and indeed fluctuation is again about 2%. But the number of context switches is just about 25% of switchtest from Xeno 2.5.6 on a PPC-2.6.34. Did you change the tasks period from 2.4.9 to 2.5.6? So, if the gurus say this variation is within the normal bandwidth it is ok for me. >Spare time has become a luxury over the last months. I'll try to find a >time slot next week to have a look at this again. Tanks a lot! I don´t dare to say, but I am on vacation for the rest of this and the next week, so I only can do testing as of 4. of July again. Roderik ---------------------------------------------------------------------------- Xenomai 2.4.9 on PPC-2.4.25: RW24:/fat/sbin # switchtest == Testing FPU check routines... r0: 1 != 2 r1: 1 != 2 r2: 1 != 2 r3: 1 != 2 r4: 1 != 2 r5: 1 != 2 r6: 1 != 2 r7: 1 != 2 r8: 1 != 2 r9: 1 != 2 r10: 1 != 2 r11: 1 != 2 r12: 1 != 2 r13: 1 != 2 r14: 1 != 2 r15: 1 != 2 r16: 1 != 2 r17: 1 != 2 r18: 1 != 2 r19: 1 != 2 r20: 1 != 2 r21: 1 != 2 r22: 1 != 2 r23: 1 != 2 r24: 1 != 2 r25: 1 != 2 r26: 1 != 2 r27: 1 != 2 r28: 1 != 2 r29: 1 != 2 r30: 1 != 2 r31: 1 != 2 == FPU check routines: OK. == Threads: sleeper_ufps-0 rtk-1 rtk-2 rtk_fp-3 rtk_fp-4 rtk_fp_ufpp-5 rtk_fp_ufpp-6 rtup-7 rtup-8 rtup_ufpp-9 rtup_ufpp-10 rtus-11 rtus-12 rtus_ufps-13 rtus_ufps-14 rtuo-15 rtuo-16 rtuo_ufpp-17 rtuo_ufpp-18 rtuo_ufps-19 rtuo_ufps-20 rtuo_ufpp_ufps-21 rtuo_ufpp_ufps-22 RTT| 00:00:01 RTH|ctx switches|-------total RTD| 1150| 1150 RTD| 1150| 2300 RTD| 1173| 3473 RTD| 1173| 4646 RTD| 1150| 5796 RTD| 1173| 6969 RTD| 1150| 8119 RTD| 1173| 9292 RTD| 1150| 10442 RTD| 1173| 11615 RTD| 1173| 12788 RTD| 1150| 13938 RTD| 1173| 15111 RTD| 1173| 16284 RTD| 1150| 17434 RTD| 1150| 18584 RTD| 1150| 19734 RTD| 1173| 20907 RTD| 1150| 22057 RTD| 1150| 23207 RTD| 1150| 24357 RTT| 00:00:22 RTH|ctx switches|-------total RTD| 1173| 25530 RTD| 1173| 26703 RTD| 1173| 27876 RTD| 1173| 29049 RTD| 1150| 30199 RTD| 1150| 31349 RTD| 1150| 32499 RTD| 1173| 33672 RTD| 1173| 34845 RTD| 1173| 36018 RTD| 1150| 37168 RTD| 1150| 38318 RTD| 1150| 39468 RTD| 1173| 40641 RTD| 1150| 41791 RTD| 1150| 42941 RTD| 1173| 44114 RTD| 1150| 45264 RTD| 1150| 46414 RTD| 1150| 47564 RTD| 1173| 48737 RTT| 00:00:43 RW24:/fat/sbin # cat /proc/xenomai/version 2.4.9 RW24:/fat/sbin # cat /proc/xenomai/sched CPU PID PRI PERIOD TIMEOUT TIMEBASE STAT NAME 0 0 -1 0 0 master R ROOT 0 0 99 200000000 45608637 master D rt-watchdog RW24:/fat/sbin # cat /proc/xenomai/stat CPU PID MSW CSW PF STAT %CPU NAME 0 0 0 38989 0 00500080 98.3 ROOT 0 0 0 701 0 00000084 0.0 rt-watchdog 0 0 0 14730 0 00000000 0.1 IRQ256: [timer] RW24:/fat/sbin # > -----Ursprüngliche Nachricht----- > Von: Gilles Chanteperdrix [mailto:gilles.chanteperd...@xenomai.org] > Gesendet: Dienstag, 21. Juni 2011 13:33 > An: Wildenburg, Roderik RAEK1 MRA > Cc: r...@xenomai.org; xenomai-help@gna.org > Betreff: Re: AW: AW: [Xenomai-help] Xenomai 2.5.6 with PPC-Kernel 2.4.25 > > On 06/21/2011 01:22 PM, roderik.wildenb...@manroland.com wrote: > >> 2% off seems a lot for a transient load, and this would not happen on a > >> periodic basis anyway. This needs to be investigated. Could you run > >> switchtest in nofpu mode? > > > > Still fluctuates about 2% (see !! mark) but now more erratic. The reduced > number of context switches is caused by the reduced number of tasks? > > switchest works by switching context between several tasks. One of this > task does sleep, in order to avoid starving linux, and also prints the > numbers approximately every second. > > When there are less task, we enter the sleeping task more often, so, > yes, there are less context switches. > > But more importantly, since, the time when we print the result is so > imprecise, some variations are normal, so, chances are that the 2% > variation is normal. > > -- > Gilles. -------------------------------------------------------- manroland AG Vorsitzender des Aufsichtsrates: Hanno C. Fiedler Vorstand: Gerd Finkbeiner (Vorsitzender), Dr. Ingo Koch, Dr. Markus Rall, Paul Steidle Sitz der Gesellschaft: Offenbach am Main, Registergericht: Amtsgericht Offenbach HRB-Nr. 42592 USt-Ident-Nr. DE 250200933 _______________________________________________ Xenomai-help mailing list Xenomai-help@gna.org https://mail.gna.org/listinfo/xenomai-help
