Hi Wolfgang, On Tue, Jan 08, 2008 at 11:13:11AM +0100, Wolfgang Grandegger wrote: > I gave -rt another try on my Icecube-MPC5200 board with > patch-2.6.24-rc5-rt1 Unfortunately, I only have 2.6.23.1-rt5 for the phyCORE-MPC5200B-tiny (400 MHz) at the moment, but I can refactor it to match your version. > and this time I got it working with the attached little patch fixing > an oops in the serial driver. Unfortunately, cyclictest reports rather > high latencies up to 500 us under load: Can you elaborate which load you are using? > # ./cyclictest -n -p80 -t1 -i10000 > 3.55 2.82 1.55 2/45 9971 > > T: 0 ( 922) P:80 I:10000 C: 64228 Min: 28 Act: 71 Avg: 78 Max: 502 This is on an idle system: ----------8<---------- root@phyCORE-MPC5200B-tiny:~ cyclictest -n -p80 -t1 -i10000 -l 64228 1.96 1.85 1.18 1/47 572 T: 0 ( 534) P:80 I: 10000 C: 64228 Min: 21 Act: 39 Avg: 38 Max: 77 ----------8<---------- This is under ping -f load: ----------8<---------- root@phyCORE-MPC5200B-tiny:~ cyclictest -n -p80 -t1 -i10000 -l 64228 2.64 2.25 1.60 1/47 632 T: 0 ( 594) P:80 I: 10000 C: 64228 Min: 24 Act: 41 Avg: 44 Max: 82 ----------8<---------- And under "(while true; do hackbench 10; done) &" load: ----------8<---------- 367.51 329.66 189.94 7/449 4284 T: 0 ( 1439) P:80 I: 10000 C: 64228 Min: 28 Act: 48 Avg: 49 Max: 88 ----------8<---------- Doesn't look too bad. rsc -- 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
