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
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