I'm running 2.6.33-rt on a powerpc platform(upgraded from 2.6.18-rt), the main application is a multi-thread program. I use procps 3.2.7 to check cpu usage, load avg etc. 2.6.33 beats 2.6.18 all around, including latency, hackbench, etc. however my pthread app always takes 13% cpu (top reports cpu 87% idle, i.e. 100%-13%=87%) while it's running and waiting for input on 2.6.33-rt, on 2.6.18-rt it's <1% cpu usage(top reports 97% idle percentage). when I disable high-res from 2.6.33-rt, cpu usage is the same but 'top' now reports 96% idle, looks like it ignores the fact that my application is using 13% cpu(I suspect the idle rate should still be 100%-13%=87%, but it's not when high-res is disabled). both kernel uses 1000HZ, 2.6.18 does not have high-res implemented. I'm trying to find the cause of the 13% cpu usage on 2.6.33, and if it has anything to do with high-res timer. Interestingly, 2.6.33 has only half the load avg comparing to 2.6.18 while my application is waiting for input, even though the application uses more cpu time but the system load is lower, which is good news. Still, why am my application suddenly showing a high cpu usage on this new rt kernel? any suggestion is appreciated, xianghua -- 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
