device polling and high load averages

[peceka]

Hi,

I've got:
fw3# uname -r
5.4-RELEASE-p7

in my kernel config i've set:
options         HZ=1000
options         DEVICE_POLLING

fw3# cat /etc/rc.conf | grep ifconfig
ifconfig_em0="inet 192.168.1.251 netmask 255.255.255.0 polling"

fw3# cat /etc/sysctl.conf | grep poll
kern.polling.enable=1
kern.polling.idle_poll=1

And all the time i've got:
fw3# uptime
11:22AM  up  1:59, 1 user, load averages: 1.00, 1.00, 0.96

from top:
last pid: 88131;  load averages:  1.00,  1.00,  0.96
24 processes:  1 running, 23 sleeping
CPU states:  0.0% user,  0.0% nice, 99.2% system,  0.8% interrupt,  0.0% idle

But this machine do nothing, just pure FBSD system. So why there is
such high load aver.?

Best regards,
p.