Hi, On Wed, 2019-06-12 at 14:03 +0200, Jiri Pirko wrote: > I did simple prifiling using perf. Output on 5.1 kernel: > 77.85% tc [kernel.kallsyms] [k] tcf_chain_tp_find > 3.30% tc [kernel.kallsyms] [k] > _raw_spin_unlock_irqrestore > 1.33% tc_pref_scale.s [kernel.kallsyms] [k] do_syscall_64 > 0.60% tc_pref_scale.s libc-2.28.so [.] malloc > 0.55% tc [kernel.kallsyms] [k] mutex_spin_on_owner > 0.51% tc libc-2.28.so [.] > __memset_sse2_unaligned_erms > 0.40% tc_pref_scale.s libc-2.28.so [.] > __gconv_transform_utf8_internal > 0.38% tc_pref_scale.s libc-2.28.so [.] _int_free > 0.37% tc_pref_scale.s libc-2.28.so [.] __GI___strlen_sse2 > 0.37% tc [kernel.kallsyms] [k] idr_get_free > > Output on net-next: > 39.26% tc [kernel.vmlinux] [k] lock_is_held_type
It looks like you have lockdep enabled here, but not on the 5.1 build. That would explain such a large perf difference. Can you please double check? thanks, Paolo
