On Thursday 10 January 2008 14:17, Wolfgang Grandegger wrote: > Hi Robert, > > Robert Schwebel wrote: > > Wolfgang, > > > > On Wed, Jan 09, 2008 at 11:51:07PM +0100, Robert Schwebel wrote: > >> Throwing in the versions from 2.6.23.3-rt5 doesn't help, the effect > >> stays the same. So I assume it is a side effect. > > > > Can you test the following patch by John Stulz (thanks to John for the > > quick help on irc!), which fixes the issues on my board: > > > > ----------8<---------- > > Index: linux-2.6.24-rc5/arch/powerpc/kernel/time.c > > =================================================================== > > --- linux-2.6.24-rc5.orig/arch/powerpc/kernel/time.c > > +++ linux-2.6.24-rc5/arch/powerpc/kernel/time.c > > @@ -773,7 +773,7 @@ void update_vsyscall(struct timespec *wa > > stamp_xsec = (u64) xtime.tv_nsec * XSEC_PER_SEC; > > do_div(stamp_xsec, 1000000000); > > stamp_xsec += (u64) xtime.tv_sec * XSEC_PER_SEC; > > - update_gtod(clock->cycle_last, stamp_xsec, t2x); > > + update_gtod(clock->cycle_last-clock->cycle_accumulated, stamp_xsec, > > t2x); } > > > > void update_vsyscall_tz(void) > > ----------8<---------- > > > > With this patch ontop of 2.6.24-rc5-rt1 plus the board support patches > > for the phyCORE-MPC5200B-tiny, I get this result from cyclictest, again > > under "(while true; do hackbench 10; done) &" load: > > > > T: 0 ( 867) P:80 I: 10000 C: 105002 Min: 31 Act: 48 Avg: > > 51 Max: 92 > > Unfortunately, it doesn't really help on my Icecube board. > > bash-3.00# ./cyclictest -n -p80 -i1000 > 129.85 93.18 38.05 4/45 6354 > 130.41 162.23 83.05 3/49 8395 > T: 0 ( 4621) P:80 I:1000 C: 477097 Min: 25 Act: 64 Avg: 67 Max: > 286 > > bash-3.00# ./hackbench 10 > Time: 95.402 > > Could you run your cyclictest much longer? > > And hackbench takes ages, already without running cyclictest: Did your read http://lkml.org/lkml/2007/12/7/181 ? Don't know if it is relevant here. Juergen -- Dipl.-Ing. Juergen Beisert | http://www.pengutronix.de Pengutronix - Linux Solutions for Science and Industry Handelsregister: Amtsgericht Hildesheim, HRA 2686 Vertretung Sued/Muenchen, Germany Phone: +49-8766-939 228 | Fax: +49-5121-206917-9 - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
