CVSROOT: /cvs
Module name: src
Changes by: henn...@cvs.openbsd.org 2009/08/12 09:58:20
Modified files:
sys/net : if.c
Log message:
dlg deferred calling interfaces' if_start routine so we call them less,
which does pay out, performance wise. one of the conditions to call the
interfaces' if_start routine immediately was "send queue is full".
on a very busy (hammered) machine this will itroduce too much latency
since we spend almost all cpu time in interrupt handlers and softnet,
so the softint actually doing the if_start gets called to seldom and
the queue full check is what triggers the actual transmit.
change the logic to call if's if_start routing immediately when there are
at least 8 packets (or in case if maxlen being smaller than 8, maxlen)
8 chose because it shows best performance in my test setup here.
ok dlg
