On 07/29/2011 01:10 PM, Hinko Kocevar wrote:
Hi,
I've build linux-3.0-rt6 for my ARM platform (XCEP). Running cycletest
on vanilla, preempt and rt6 kernel build reviles the following results.
I would expect better rt6 performance.
Note that last test actually looks quite promising, but it happened once
in 5 test runs :(
Mike Galbraith pointed me into the right direction with the heads up
about the ksoftirqd/0 process that hogged the CPU for a short moment,
enough to make cycletest 'Max' column numbers high.
Reading some googled results about the ksoftirqd made me suspicious
about the network traffic
-http://www.gossamer-threads.com/lists/quagga/dev/17725
Since I'm running my board of the NFS rootfs I opted for using -q switch
with the cycletest. The result was 5/5 test runs with best 'Max' column :)
$ ssh root@192.168.11.132 /shared/utils/cyclictest -t 10 -p 80 -n -D 30 -q
WARNING: Most functions require kernel 2.6
T: 0 ( 707) P:80 I:1000 C: 29001 Min: 16 Act: 129 Avg: 203 Max:
504
T: 1 ( 708) P:79 I:1500 C: 19333 Min: 16 Act: 217 Avg: 204 Max:
602
T: 2 ( 709) P:78 I:2000 C: 14500 Min: 16 Act: 89 Avg: 163 Max:
575
T: 3 ( 710) P:77 I:2500 C: 11600 Min: 16 Act: 195 Avg: 222 Max:
590
T: 4 ( 711) P:76 I:3000 C: 9666 Min: 16 Act: 395 Avg: 358 Max:
697
T: 5 ( 712) P:75 I:3500 C: 8285 Min: 16 Act: 115 Avg: 263 Max:
767
T: 6 ( 713) P:74 I:4000 C: 7249 Min: 16 Act: 265 Avg: 262 Max:
637
T: 7 ( 714) P:73 I:4500 C: 6443 Min: 17 Act: 74 Avg: 220 Max:
734
T: 8 ( 715) P:72 I:5000 C: 5797 Min: 17 Act: 353 Avg: 294 Max:
730
T: 9 ( 716) P:71 I:5500 C: 5264 Min: 18 Act: 207 Avg: 264 Max:
696
--
Hinko Kocevar
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