https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287872
--- Comment #8 from Eugene Grosbein <eu...@freebsd.org> --- I tried to use hwpmc(4) to profile the kernel: # kenv kern.hwpmc.logbuffersize=64 # kenv kern.hwpmc.nbuffers_pcpu=512 # kldload hwpmc Then removed all vlans, stopped devd, recreated vlans. Then: # pmcstat -S inst_retired.any_p -O devd.out & # service devd start # kill -INT %1 # pmcstat -R devd.out -g And "gprof -l /boot/kernel/kernel inst_retired.any_p/kernel.gmon" shows the following: % cumulative self self total time seconds seconds calls ms/call ms/call name 44.5 131231.00 131231.00 28705 4571.71 4571.71 lock_delay [2] 22.6 197818.00 66587.00 67341 988.80 988.80 DELAY [19] 3.1 207038.00 9220.00 2875 3206.96 3807.34 pmap_remove_pages <cycle 4> [36] 1.4 211181.00 4143.00 1134 3653.44 7948.42 pmap_enter_quick_locked [38] 1.3 215064.00 3883.00 956 4061.72 4138.80 get_pv_entry [48] 1.3 218829.00 3765.00 1053 3575.50 4107.77 pmap_enter [45] 1.0 221869.00 3040.00 1639 1854.79 4229.11 pmap_try_insert_pv_entry [39] Above profiling for stock /sbin/ifconfig using netlink. Below for /sbin/ifconfig rebuilt without netlink and same profiling procedure: % cumulative self self total time seconds seconds calls ms/call ms/call name 11.1 581.00 581.00 422 1376.78 1376.78 counter_u64_fetch [16] 8.7 1037.00 456.00 226 2017.70 2017.70 DELAY [25] 6.6 1383.00 346.00 375 922.67 1037.36 pmap_remove_pages [26] 6.2 1709.00 326.00 187 1743.32 1743.32 strncmp [28] 3.2 1875.00 166.00 10 16600.00 21475.00 rtsock_msg_buffer [49] 2.6 2013.00 138.00 86 1604.65 1889.35 pmap_enter [52] 2.3 2134.00 121.00 512 236.33 2146.13 sysctl_iflist [7] 2.3 2253.00 119.00 124 959.68 1009.98 get_pv_entry [57] 2.1 2361.00 108.00 220 490.91 1000.49 pmap_try_insert_pv_entry [48] -- You are receiving this mail because: You are the assignee for the bug.
