glebius c150a0f6fa Existense of PCB route caching doesn't allow us to use new fast route
lookup KPI in ip_output() like it is already used in ip_forward().
However, when there is no PCB provided we can use fast KPI, gaining
performance advantage.

Typical case when ip_output() is called without a PCB pointer is a
sendto(2) on a not connected UDP socket. In practice DNS servers do
this.

Reviewed by:	melifaro
Differential Revision:	https://reviews.freebsd.org/D19804
2019-05-08 23:39:24 +00:00
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