On Thu, Mar 03 2016, Sitsofe Wheeler wrote: > On 3 March 2016 at 03:03, Vladislav Bolkhovitin <vst@xxxxxxxx> wrote: > > For those who asked about perf profiling, it remained the same as before with the CPU > > consumption is all about timekeeping and memset: > > > > - 55.74% fio fio [.] clock_thread_fn > > clock_thread_fn > > Perhaps this is what is already included above but could you use the > -g option on perf to collect it into a call-graph and post the top > results? The above looks like a side effect of using gtod_cpu, it'll burn one core. For the original poster - did you verify whether using gtod_cpu was faster than using the CPU clock source in each CPU? -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
