SoftNetStats - file /proc/net/softnet_stat

This parser parses the stats from network devices. These stats includes events per cpu(in row), number of packets processed i.e packet_process (first column), number of packet drops packet_drops (second column), time squeeze i.e net_rx_action performed time_squeeze(third column), cpu collision i.e collision occur while obtaining device lock while transmitting cpu_collision packets (eighth column), received_rps number of times cpu woken up received_rps (ninth column), number of times reached flow limit count flow_limit_count (tenth column).

The typical contents of cat /proc/net/softnet_stat file is as below:

00008e78 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
000040ee 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
0001608c 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
0000372f 00000001 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

Column-01: packet_process: Packet processed by each CPU.
Column-02: packet_drop: Packets dropped.
Column-03: time_squeeze: net_rx_action.
Column-08: cpu_collision: collision occur while obtaining device lock while transmitting.
Column-09: received_rps: number of times cpu woken up received_rps.
Column-10: flow_limit_count: number of times reached flow limit count.

Note

There is minimal documentation about these fields in the file, columns are not labeled and could change between the kernel releases. This format is compatible for RHEL-6 and RHEL-7 releases. Also it is unlikely that the positions of those values will change in short term.

Examples

>>> SOFTNET_STATS = '''
... 00008e78 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
... 000040ee 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
... 0001608c 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
... 0000372f 00000001 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
...'''.strip()
>>> softnet_obj = SoftNetStats(context_wrap(SOFTNET_STATS))
>>> softnet_obj.is_packet_drops()
True
>>> softnet_obj.cpu_instances
4
>>> softnet_obj.per_cpu_nstat('packet_drops')
[0, 0, 0, 1]

class insights.parsers.softnet_stat.SoftNetStats(context)

Bases: insights.core.Parser

Parses /proc/net/softnet_stat file contains

cpu_instances = None

List of network stats per cpu instace

property is_packet_drops

It will check for if there is packet drop occurred on any cpu.

Parameters

None -- No input argument for the function

Returns

It will return True if observed packet drops.

Return type

(bool)

parse_content(contents)

This method must be implemented by classes based on this class.

per_cpu_nstat(key)

Get network stats per column for all cpu.

Parameters

(str) -- Column name for eg. packet_drops or received_rps.

Returns

Column states per cpu.

Return type

(list)