DRR

The following classes provides access to the drr (deficit round robin) queueing discipline and its statistics:

class DRRQDisc(handle: Handle, parent_handle: Optional[Handle])[source]

Bases: QDisc

This class provides access to the multiqueue (drr) queueing discipline of Linux

Parameters:

  • handle – Handle of this QDisc

  • parent_handle – Handle of the parent of this QDisc (if None, this is a root QDisc)

qdisc_creation_args() → List[str][source]

Returns the arguments expected by the tc(8) command to create a DRR qdisc

dump(outfile: TextIO, level=0, qclass_map: Optional[Mapping[Handle, QClass]] = None)

Recursively dump this Qdisc to outfile.

The qclass_map, if present, is used to determine the destination QClass objects of traffic filters.

get_config() → QDiscConfig

Returns the QDiscConfig where this QDisc/QClass has been instantiated, or None if not instantiated.

get_description() → str

Return a string that fully describes this QDisc

get_handle() → Handle

Returns the QDisc/QClass handle

get_interface() → Optional[str]

Returns the interface where this QDisc/QClass has been instantiated, or None if the QDisc/QClass is not instantiated.

get_parent_handle() → Optional[Handle]

Returns the handle of the parent of this QDisc/QClass

get_stats() → Optional[QStats]

Returns queuing stats.

is_default() → bool

Returns True if this QDisc is the default qdisc used by the kernel.

static is_ingress() → bool

Returns True if this QDisc is the ingress qdisc

is_root() → bool

Returns True if this is a root QDisc

class DRRQClass(class_handle: Handle, parent_handle: Handle, *, quantum: int)[source]

Bases: QClass

A class of the DRRQDisc (drr) queuing discipline.

Parameters:

  • class_handle – handle of this DRRQClass

  • parent_handle – handle of parent DRRQDisc

  • quantum – number of bytes to dequeue per turn

get_description() → str[source]

Returns a string describing the class and its attributes

get_quantum() → int[source]

Returns the quantum (bytes)

get_stats() → Optional[DRRQClassStats][source]

Returns class stats (an DRRQClassStats instance) or None if no stats are available.

qclass_creation_args() → List[str][source]

Returns the tc arguments to create this DRR class

dump(outfile: TextIO, level: int, qclass_map: Optional[Mapping[Handle, QClass]] = None)

Recursively dump this QClass to outfile.

The qclass_map, if present, is used to determine the destination QClass objects of traffic filters.

get_class_name() → str

Returns the class name

get_config() → QDiscConfig

Returns the QDiscConfig where this QDisc/QClass has been instantiated, or None if not instantiated.

get_handle() → Handle

Returns the QDisc/QClass handle

get_interface() → Optional[str]

Returns the interface where this QDisc/QClass has been instantiated, or None if the QDisc/QClass is not instantiated.

get_parent_handle() → Optional[Handle]

Returns the handle of the parent of this QDisc/QClass

get_qdisc() → Optional[QDisc]

Returns the QDisc under this QClass; returns None if there is no QDisc, or if this is not a leaf queuing class

is_leaf() → bool

Returns True if this is a leaf queuing class

set_class_name(class_name: str) → None

Sets the class name

set_qdisc(qdisc: QDisc) → None

Set the QDisc under this queuing class

class DRRQClassStats[source]

Bases: QStats

DRR-specific class stats (see QStats for inherited stats)

property deficit: int

Byte deficit

dump(outfile: TextIO, width: Optional[int] = None) → None[source]

Dump stats to outfile. There is one stat per line output. Each line has the format:

header: value

The header: part occupies at least width characters.

property bitrate: int

Consumed bandwidth measured in bits/sec

property bytes_sent: int

Number of bytes sent.

property dropped_packets: int

Number of packets dropped.

get_byte_backlog() → int

Queue backlog in bytes

get_overlimits() → int

Number of times a packet was delayed due to rate limits.

get_packet_backlog() → int

Queue backlog in packets

property packetrate: int

Consumed bandwidth measured in packets/sec

property packets_sent: int

Number of packets sent.

property requeued_packets: int

Number of packets that were requeued for some reason.