mbuf subcommand
The mbuf subcommand displays data structure (mbuf) information. Mbufs are used to store data in the kernel for incoming and outbound network traffic.
Format
mbuf [-p | [-a effectiveaddress] [-n effectiveaddress] [-d effectiveaddress]]
Parameters
| Item | Description |
|---|---|
| -p | Displays the private mbuf structure pool information. |
| -a | Follows the packet chain. The effectiveaddress parameter is required for this flag. |
| -n | Follows the mbuf structure chain within a packet. The effectiveaddress parameter is required for this flag. |
| -d | Prints the mbuf structure data along with the mbuf header. This is helpful when you need mbuf data information. You must use the effectiveaddress parameter with this flag. |
| effectiveaddress | Specifies the effective address of an mbuf structure to be displayed. Use symbols, hexadecimal values, or hexadecimal expressions to specify the address. |
Display the packet chain and mbuf structure chains within packets by using the -a parameter and the -n parameter.
Other
No aliases.
Examples
The following is an example of how to use the mbuf subcommand:
KDB(1)> mbuf -p total cluster pools............00000001 cluster pool @..........700F8D40
p_next..................00000000 p_size..................0000000A p_inuse.................00000001
m_outcnt................00000001 m_maxoutcnt.............00000002 next....................70168F00
tail....................70110F00 p_lock..................004A7EE4 p_debug
@...............70EF6600 failed..................00000000 KDB(1)> mbuf 70168F00
m.......................70168F00 m_next..................00000000 m_nextpkt...............71210F00
m_data..................71164800 m_len...................00000010 m_type..........
0001 DATA m_flags......... 0041 (M_EXT|M_EXT2) ext_buf.................71164800
ext_free................0026C058 ext_size................00000400 ext_arg.................700F8D40
ext_forw................70168F2C ext_back................70168F2C ext_hasxm...............00000000
ext_xmemd.....@.........70168F38 ext_debug.....@.........70EF6750
------------------------------------------------------------------
71164800: 7116 4400 3172 D58C 0000 0000 0000 0000 q.D.1r..........