Il Wed, Aug 22, 2007 at 08:02:07AM +0300, Avi Kivity ha scritto: > Luca Tettamanti wrote: > > > Actually I'm having troubles with cyclesoak (probably it's calibration), > > numbers are not very stable across multiple runs... > > > > I've had good results with cyclesoak; maybe you need to run it in > runlevel 3 so the load generated by moving the mouse or breathing > doesn't affect meaurements.
This is what I did, I tested with -no-grapich in text console. > > The guest is an idle kernel with HZ=1000. > > > > Can you double check this? The dyntick results show that this is either > a 100Hz kernel, or that there is a serious bug in dynticks. Ops I sent the wrong files, sorry. This is QEMU, with dynticks and HPET: % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 52.10 0.002966 0 96840 clock_gettime 19.50 0.001110 0 37050 timer_gettime 10.66 0.000607 0 20086 timer_settime 10.40 0.000592 0 8985 2539 sigreturn 4.94 0.000281 0 8361 2485 select 2.41 0.000137 0 8362 gettimeofday ------ ----------- ----------- --------- --------- ---------------- 100.00 0.005693 179684 5024 total % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 93.37 0.025541 3 10194 10193 select 4.82 0.001319 0 33259 clock_gettime 1.10 0.000301 0 10195 gettimeofday 0.71 0.000195 0 10196 10194 sigreturn ------ ----------- ----------- --------- --------- ---------------- 100.00 0.027356 63844 20387 total And this KVM: % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 42.66 0.002885 0 45527 24 ioctl 25.62 0.001733 0 89305 clock_gettime 13.12 0.000887 0 34894 timer_gettime 7.97 0.000539 0 18016 timer_settime 4.70 0.000318 0 12224 7270 rt_sigtimedwait 2.79 0.000189 0 7271 select 1.86 0.000126 0 7271 gettimeofday 1.27 0.000086 0 4954 rt_sigaction ------ ----------- ----------- --------- --------- ---------------- 100.00 0.006763 219462 7294 total % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 49.41 0.004606 0 59900 27 ioctl 24.14 0.002250 0 31252 21082 rt_sigtimedwait 9.65 0.000900 0 51856 clock_gettime 8.44 0.000787 0 17819 select 4.42 0.000412 0 17819 gettimeofday 3.94 0.000367 0 10170 rt_sigaction ------ ----------- ----------- --------- --------- ---------------- 100.00 0.009322 188816 21109 total Luca -- Runtime error 6D at f000:a12f : user incompetente