rfc9571v5.txt		rfc9571.txt
	Internet Engineering Task Force (IETF) S. Bryant, Ed.		Internet Engineering Task Force (IETF) S. Bryant, Ed.
	Request for Comments: 9571 Futurewei Technologies Inc.		Request for Comments: 9571 University of Surrey
	Category: Standards Track G. Swallow		Category: Standards Track G. Swallow
	ISSN: 2070-1721 Southend Technical Center		ISSN: 2070-1721 Independent
	M. Chen		M. Chen
	Huawei		Huawei
	G. Fioccola		G. Fioccola
	Huawei Technologies		Huawei Technologies
	G. Mirsky		G. Mirsky
	ZTE Corp.		ZTE Corp.
	May 2024		May 2024
	Extension of RFC 6374-Based Performance Measurement Using Synonymous		Extension of RFC 6374-Based Performance Measurement Using Synonymous
	Flow Labels		Flow Labels
	skipping to change at line 415 ¶		skipping to change at line 415 ¶
	characteristics:		characteristics:
	1. Number of packets in the batch (n)		1. Number of packets in the batch (n)
	2. Sum of delays in a batch (S)		2. Sum of delays in a batch (S)
	3. Maximum delay		3. Maximum delay
	4. Minimum delay		4. Minimum delay
	5. Sum of squares of inter-packet delay (SS)		5. Sum of squares of inter-packet delay (SumS)
	Characteristics 1 and 2 give the mean delay. Measuring the delay of		Characteristics 1 and 2 give the mean delay. Measuring the delay of
	each pair in the batch is discussed in Section 7.3.		each pair in the batch is discussed in Section 7.3.
	Characteristics 3 and 4 give the outliers.		Characteristics 3 and 4 give the outliers.
	Characteristics 1, 2, and 5 can be used to calculate the variance of		Characteristics 1, 2, and 5 can be used to calculate the variance of
	the inter-packet gap, hence the standard deviation giving a view of		the inter-packet gap, hence the standard deviation giving a view of
	the distribution of packet delays and hence the jitter. The equation		the distribution of packet delays and hence the jitter. The equation
	for the variance (var) is given by:		for the variance (var) is given by:
	var = (SS - S*S/n)/(n-1)		var = (SumS - S*S/n)/(n-1)
	There is some concern over the use of this algorithm for measuring		There is some concern over the use of this algorithm for measuring
	variance because SS and S*S/n can be similar numbers, particularly		variance because SumS and S*S/n can be similar numbers, particularly
	where variance is low. However, the method is acceptable because it		where variance is low. However, the method is acceptable because it
	does not require a division in the hardware.		does not require a division in the hardware.
	7.2.1. Multi-packet Delay Measurement Message Format		7.2.1. Multi-packet Delay Measurement Message Format
	The packet format of a Multi-packet Delay Measurement message is		The packet format of a Multi-packet Delay Measurement message is
	shown below:		shown below:
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	skipping to change at line 900 ¶		skipping to change at line 900 ¶
	Huawei		Huawei
	Email: lizhenbin@huawei.com		Email: lizhenbin@huawei.com
	Siva Sivabalan		Siva Sivabalan
	Ciena Corporation		Ciena Corporation
	Email: ssivabal@ciena.com		Email: ssivabal@ciena.com
	Authors' Addresses		Authors' Addresses
	Stewart Bryant (editor)		Stewart Bryant (editor)
	Futurewei Technologies Inc.		University of Surrey
	Email: sb@stewartbryant.com		Email: sb@stewartbryant.com
	George Swallow		George Swallow
	Southend Technical Center		Independent
	Email: swallow.ietf@gmail.com		Email: swallow.ietf@gmail.com
	Mach(Guoyi) Chen		Mach(Guoyi) Chen
	Huawei		Huawei
	Email: mach.chen@huawei.com		Email: mach.chen@huawei.com
	Giuseppe Fioccola		Giuseppe Fioccola
	Huawei Technologies		Huawei Technologies
	Email: giuseppe.fioccola@huawei.com		Email: giuseppe.fioccola@huawei.com
End of changes. 7 change blocks.
	7 lines changed or deleted		7 lines changed or added
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