atheros card with lots of Ierrs in `netstat -i`

hi there,

`netstat -i` reports:

Name    Mtu Network       Address              Ipkts Ierrs Idrop    Opkts
Oerrs  Coll
ath0   2290 <Link#1>      00:0f:b5:82:07:c8  6046435 691159     0   654080
0     0
lo0   16384 <Link#2>                         1280796     0     0  1280796
0     0
lo0   16384 your-net      localhost.otaku    1280796     -     -  1280796
-     -
wlan0  1500 <Link#3>      00:0f:b5:82:07:c8   821650     0     0   635461
20     0
wlan0  1500 192.168.1.0   localhost.otaku     821223     -     -   635140
-     -

are the Ierrs for ath0 normal or is this something to worry about? i'm running
HEAD (r205561) on amd64. this is my card:

ath0_at_pci0:5:1:0:        class=0x020000 card=0x5a001385 chip=0x0013168c
rev=0x01 hdr=0x00
    vendor     = 'Atheros Communications Inc.'
    device     = '802.11a/b/g Wireless Adapter (AR2312)'
    class      = network
    subclass   = ethernet

-- 
Alexander Best