On 05/03/2015 09:23 AM, Mike Galbraith wrote: > Below are v4.1-rc1-172-g6c3c1eb3c35e + patches measurements. > > 100M * stat() on isolated cpu > > NO_HZ_FULL off inactive housekeeper nohz_full > real 0m14.266s 0m14.367s 0m20.427s 0m27.921s > user 0m1.756s 0m1.553s 0m1.976s 0m10.447s > sys 0m12.508s 0m12.769s 0m18.400s 0m17.464s > (real) 1.000 1.007 1.431 1.957 > 1.000 1.000 > > real 0m20.423s 0m27.930s +rik 1,2 > user 0m2.072s 0m10.450s > sys 0m18.304s 0m17.471s > vs off 1.431 1.957 > vs prev 1.000 1.000 > > real 0m20.256s 0m27.803s +paolo 1,2 (2 > missing prototypes) > user 0m1.884s 0m10.551s > sys 0m18.353s 0m17.242s > vs off 1.419 1.948 > vs prev .991 .995 > > real 0m19.122s 0m26.946s +rik 3 > user 0m1.896s 0m10.292s > sys 0m17.198s 0m16.644s > vs off 1.340 1.888 > vs prev .944 .969
I'm convinced. Time to try the remote sampling of CPU use statistics, and lighten up the RCU overhead of context tracking. I should be able to start on the remote sampling of CPU use statistics this week. -- All rights reversed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
