IBM pSeries - Manual (Page 25)

pshpstuningguidewp040105.doc Page 25
Run the following command:
/usr/sbin/ifsn_dump -a
The data is collected in sni.snap (sni_dump.out.Z), and provides useful information, such as the
local mac address:
mac_addr 0:0:0:40:0:0
If you are seeing arpq drops, ensure the source has the correct mac_addr for its destination.
The ndd statistics listed in ifsn_dump are useful for measuring packet drops in relation to the
overall number of packets sent and received. ifsn_dump provides 64-bit counters for drops,
sends, and receives, using msw and lsw 32-bit words. These 64-bit counters can be more useful
than the 32-bit counters listed in netstat, because these 32-bit counters (limited to 4GB) can be
quickly wrapped under heavy traffic loads on the switch.
Here is an example of ndd statistics listed by the ifsn_dump –a command:
| ndd_ipackets_msw 0x00000000 [0]
| ndd_ipackets_lsw 0x00026357 [156503]
| ndd_ibytes_msw 0x00000000 [0]
| ndd_ibytes_lsw 0x012756be [19355326]
| ndd_recvintr_msw 0x00000000 [0]
| ndd_recvintr_lsw 0x00000000 [0]
| ndd_ierrors 0x00000000 [0]
| ndd_opackets_msw 0x00000000 [0]
| ndd_opackets_lsw 0x00022595 [140693]
| ndd_obytes_msw 0x00000000 [0]
| ndd_obytes_lsw 0x01172099 [18292889]
| ndd_xmitintr_msw 0x00000000 [0]
| ndd_xmitintr_lsw 0x00000000 [0]
| ndd_oerrors 0x00000000 [0]
| ndd_nobufs 0x00000000 [0]
| ndd_xmitque_max 0x00000000 [0]
| ndd_xmitque_ovf 0x00000000 [0]
| ndd_recvintr_msw 0x00000000 [0]
| ndd_recvintr_lsw 0x00000000 [0]
| ndd_ierrors 0x00000000 [0]
| ndd_opackets_msw 0x00000000 [0]
| ndd_opackets_lsw 0x00022595 [140693]
| ndd_obytes_msw 0x00000000 [0]
| ndd_obytes_lsw 0x01172099 [18292889]
| ndd_xmitintr_msw 0x00000000 [0]
| ndd_xmitintr_lsw 0x00000000 [0]
| ndd_oerrors 0x00000000 [0]
| ndd_nobufs 0x00000000 [0]
| ndd_xmitque_max 0x00000000 [0]
| ndd_xmitque_ovf 0x00000000 [0]
| ndd_ipackets_drop 0x00000000 [0]
| ndd_ibadpackets 0x00000000 [0]
| ndd_opackets_drop 0x00000000 [0]
| ndd_xmitque_cur 0x00000000 [0]
| ndd_ifOutUcastPkts_msw 0x00000000 [0]
| ndd_ifOutUcastPkts_lsw 0x00020e67 [134759]
| ndd_ifOutMcastPkts_msw 0x00000000 [0]
| ndd_ifOutMcastPkts_lsw 0x00000000 [0]
| ndd_ifOutBcastPkts_msw 0x00000000 [0]
| ndd_ifOutBcastPkts_lsw 0x0000172e [5934]