Stochastic Fairness Queueing (SFQ)
[Queueing Discipline Modules]

---

Detailed Description

Parameter Description

• Quantum: Number of bytes to send out per slot and round.
• Perturbation: Timer period between changing the hash function.
• Limit: Upper limit of queue in number of packets before SFQ starts dropping packets.
• Divisor: Hash table divisor, i.e. size of hash table.

---

Function Documentation

int rtnl_sfq_set_quantum	(	struct rtnl_qdisc *	qdisc,
		int	quantum
	)

Parameters:

	qdisc	SFQ qdisc to be modified.
	quantum	New quantum in bytes.

Returns:

0 on success or a negative error code.

Definition at line 154 of file sfq.c.

int rtnl_sfq_get_quantum

(

struct rtnl_qdisc *

qdisc

)

Parameters:

qdisc

SFQ qdisc.

Returns:

Quantum in bytes or a negative error code.

Definition at line 173 of file sfq.c.

int rtnl_sfq_set_limit	(	struct rtnl_qdisc *	qdisc,
		int	limit
	)

Parameters:

	qdisc	SFQ qdisc to be modified.
	limit	New limit in number of packets.

Returns:

0 on success or a negative error code.

Definition at line 190 of file sfq.c.

int rtnl_sfq_get_limit

(

struct rtnl_qdisc *

qdisc

)

Parameters:

qdisc

SFQ qdisc.

Returns:

Limit or a negative error code.

Definition at line 209 of file sfq.c.

int rtnl_sfq_set_perturb	(	struct rtnl_qdisc *	qdisc,
		int	perturb
	)

Parameters:

	qdisc	SFQ qdisc to be modified.
	perturb	New perturbation interval in seconds.

Note:

A value of 0 disables perturbation altogether.

Returns:

0 on success or a negative error code.

Definition at line 227 of file sfq.c.

int rtnl_sfq_get_perturb

(

struct rtnl_qdisc *

qdisc

)

Parameters:

qdisc

SFQ qdisc.

Returns:

Perturbation interval in seconds or a negative error code.

Definition at line 246 of file sfq.c.

int rtnl_sfq_get_divisor

(

struct rtnl_qdisc *

qdisc

)

Parameters:

qdisc

SFQ qdisc.

Returns:

Divisor in number of entries or a negative error code.

Definition at line 262 of file sfq.c.