On Thu, 2008-01-10 at 23:44 +0100, Guillaume Chazarain wrote: > David Dillow <dillowda@xxxxxxxx> wrote: > > > At the moment, I'm not sure how to track this farther, or how to fix it > > properly. Any advice would be appreciated. > > Just out of curiosity, could you try the appended cumulative patch and > report .clock_warps, .clock_overflows and .clock_underflows as you did. With those patches, CONFIG_NO_HZ works just fine. Patched kernel, nohz=off: now at 214257.820809 msecs .clock : 214212.727559 .idle_clock : 0.000000 .prev_clock_raw : 244569.402345 .clock_warps : 0 .clock_overflows : 577 .clock_underflows : 213887 .clock_deep_idle_events : 4 .clock_max_delta : 0.999830 Patched kernel, nohz=on: now at 248931.524381 msecs .clock : 248745.808465 .idle_clock : 0.000000 .prev_clock_raw : 270911.098507 .clock_warps : 0 .clock_overflows : 69 .clock_underflows : 784 .clock_deep_idle_events : 4 .clock_max_delta : 100.639397 Running my disk test, blktrace is getting the proper timestamps now with CONFIG_NO_HZ. Thanks! -- Dave Dillow National Center for Computational Science Oak Ridge National Laboratory (865) 241-6602 office - To unsubscribe from this list: send the line "unsubscribe linux-btrace" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
