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 Robert -- Robert Schwebel | http://www.pengutronix.de OSADL Testlab @ Pengutronix | http://www.osadl.org - 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
