Hi! On unloaded x60 system, 2.6.24-rc3 (tainted-pavel-so if someone can reproduce it, it would be helpful):
[EMAIL PROTECTED]:~$ while true; do time sleep 0.01; done 0.00user 0.00system 0.01 (0m0.013s) elapsed 30.71%CPU 0.00user 0.00system 0.02 (0m0.024s) elapsed 8.36%CPU 0.00user 0.00system 0.01 (0m0.013s) elapsed 15.53%CPU 0.00user 0.00system 0.02 (0m0.026s) elapsed 7.75%CPU 0.00user 0.00system 0.01 (0m0.013s) elapsed 23.34%CPU 0.00user 0.00system 0.20 (0m0.207s) elapsed 1.45%CPU 0.00user 0.00system 0.01 (0m0.013s) elapsed 15.59%CPU 0.00user 0.00system 0.23 (0m0.230s) elapsed 1.30%CPU 0.00user 0.00system 0.01 (0m0.013s) elapsed 15.61%CPU 0.00user 0.00system 0.20 (0m0.201s) elapsed 1.48%CPU 0.00user 0.00system 0.01 (0m0.013s) elapsed 15.50%CPU 0.00user 0.00system 0.19 (0m0.190s) elapsed 1.05%CPU 0.00user 0.00system 0.01 (0m0.013s) elapsed 23.37%CPU 0.00user 0.00system 0.04 (0m0.049s) elapsed 4.09%CPU 0.00user 0.00system 0.01 (0m0.013s) elapsed 23.35%CPU 0.00user 0.00system 0.01 (0m0.017s) elapsed 11.89%CPU 0.00user 0.00system 0.01 (0m0.013s) elapsed 23.38%CPU 0.00user 0.00system 0.08 (0m0.081s) elapsed 3.71%CPU 0.00user 0.00system 0.01 (0m0.013s) elapsed 23.33%CPU 0.00user 0.00system 0.01 (0m0.019s) elapsed 15.92%CPU nohz=off helps a lot. while true; do time sleep 0.0; done does not have unexpected latencies. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/