Robert Schwebel wrote: > 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. You are obviously using a 2.6.23.1 with private patches for MPC5200 as there is no FEC driver or no clock event support in that version. The _official_ 2.6.24-rc5 finally builds fine and works for my Icecube-Eval-Board :-). Yes, it would make sense to add board support for the phyCORE-MPC5200B-tiny for that 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? "while ls; do ls; done" in a telnet window, "ping -f <host-ip>" and the cache calibrator. >> # ./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. Some time in the past I also measured much better values and likely there is a problem with the official version. Wolfgang. - 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
