How to get burst value from TBF disc

[Sławek Kapłoński]

Hi,

I have simple script to set and then read value of tbf qdisc of interface:

import pprint

import pyroute2

device = "test_tap_tbf"

ip = pyroute2.IPRoute()

idx = ip.link_lookup(ifname=device)[0]

ip.tc("replace", 'tbf', idx, 0, rate='1024kbit', latency='50ms', burst=1540)

qdiscs = ip.get_qdiscs(idx)

pprint.pprint(qdiscs)

As a result I have something like

[{'attrs': [('TCA_KIND', 'tbf'),

            ('TCA_OPTIONS', {'attrs': [('TCA_TBF_PARMS', {'rate___reserved': 1, 'rate_mpu': 0, 'buffer': 187984, 'rate_cell_align': 0, 'peak_overhead': 0, 'rate': 128000, 'rate_overhead': 0, 'peak_cell_align': 0, 'peak_cell_log': 0, 'rate_cell_log': 0, 'limit': 7940, 'mtu': 0, 'peak_mpu': 0, 'peak___reserved': 0, 'peak': 0})]}),

            ('TCA_STATS2', {'attrs': [('TCA_STATS_BASIC', {'packets': 0, 'bytes': 0}), ('TCA_STATS_QUEUE', {'qlen': 0, 'requeues': 0, 'overlimits': 0, 'drops': 0, 'backlog': 0})]}),

            ('TCA_STATS', {'pps': 0, 'qlen': 0, 'bytes': 0, 'drop': 0, 'packets': 0, 'overlimits': 0, 'bps': 0, 'backlog': 0})],

  'event': 'RTM_NEWQDISC',

  'family': 0,

  'handle': 2150825984,

  'header': {'error': None,

             'flags': 2,

             'length': 180,

             'pid': 19331,

             'sequence_number': 257,

             'type': 36},

  'index': 27636,

  'info': 2,

  'pad1': 0,

  'pad2': 0,

  'parent': 4294967295}]

As I know that rate value is what I set as rate but in bits, I have no idea how to get burst value from it and in what units it is. Can someone maybe help me how to find it there?

[Peter Saveliev]

I'm not sure that the kernel returns that info, but we'll see. Let me investigate a bit.

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[Peter Saveliev]

Good to know! Thanks, I'll take a look!

2018-03-19 11:44 GMT+01:00 Sławek Kapłoński <sla...@kaplonski.pl>:

When I check it with "tc" CLI tool it gives me burst value properly so I am pretty sure that kernel returns this value somehow :)

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