Here's the kernel with CPU_IDLE disabled: http://people.linaro.org/~rsalveti/linux-image-3.1.0-1402-linaro-lt- omap_3.1.0-1402.5_armel.deb
But I was also able to get some fast timings with it sometimes: CLOCK_REALTIME tsdiff=166351318.000000 ns (1322121994/667296966 -> 1322121994/500945648 gettimeofday tvdiff=166351.000000 us (1322121994/667296 -> 1322121994/500945 result=0.225014 CLOCK_REALTIME tsdiff=72937012.000000 ns (1322121994/744903167 -> 1322121994/671966155 gettimeofday tvdiff=72937.000000 us (1322121994/744903 -> 1322121994/671966 result=0.225014 CLOCK_REALTIME tsdiff=169189457.000000 ns (1322121995/11504731 -> 1322121994/842315274 gettimeofday tvdiff=169189.000000 us (1322121995/11504 -> 1322121994/842315 result=0.225014 But please check and see if you're able to reproduce it at your enviroment. -- You received this bug notification because you are a member of TI OMAP Developers, which is subscribed to linaro-landing-team-ti. https://bugs.launchpad.net/bugs/873453 Title: odd timing behaviour on panda Status in Linaro Texas Instruments Landing Team: New Status in Linaro Ubuntu Evaluation Builds: New Bug description: I've got a set of benchmarks that use clock_gettime like: clock_gettime(CLOCK_REALTIME, &tbefore); for(l=0;l<numloops;l++) { dostuff } clock_gettime(CLOCK_REALTIME, &tafter); nsdiff=(double)(tafter.tv_nsec - tbefore.tv_nsec); nsdiff+=1000000000.0 *(tafter.tv_sec - tbefore.tv_sec); and I've just reinstalled our local panda to using Linaro 11.09 (kernel 3.0.0-1404-linaro-lt-omap) and it's starting to get weird timing artifacts. For example: smarter_strlen_ldrd: ,102400, loops of ,62, bytes=6.054688 MB, transferred in ,3936768.000000 ns, giving, 1537.984331 MB/s smarter_strlen_ldrd: ,102400, loops of ,32, bytes=3.125000 MB, transferred in ,0.000000 ns, giving, inf MB/s smarter_strlen_ldrd: ,102400, loops of ,16, bytes=1.562500 MB, transferred in ,4180909.000000 ns, giving, 373.722557 MB/s Now there is no way that loop took 0.000000 ns! Running the same binary on an older installation runs fine. Dave To manage notifications about this bug go to: https://bugs.launchpad.net/linaro-landing-team-ti/+bug/873453/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~tiomap-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~tiomap-dev More help : https://help.launchpad.net/ListHelp
