Performance Metrics Subprotocol for QUIC
draft-kazuho-quic-perf-metrics-00
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Network Working Group K. Oku
Internet-Draft Fastly
Intended status: Standards Track February 12, 2018
Expires: August 16, 2018
Performance Metrics Subprotocol for QUIC
draft-kazuho-quic-perf-metrics-00
Abstract
This memo proposes a subprotocol that can be used to query the
performance metrics of a QUIC path.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 16, 2018.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
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described in the Simplified BSD License.
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Internet-Draft quic-perf-metrics February 2018
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. METRICS Packet . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. REQUEST Subtype . . . . . . . . . . . . . . . . . . . . . 5
3.2. RESPONSE Subtype . . . . . . . . . . . . . . . . . . . . 6
3.3. DENY Subtype . . . . . . . . . . . . . . . . . . . . . . 7
4. Server Behavior . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Server State . . . . . . . . . . . . . . . . . . . . . . 8
5. Normative References . . . . . . . . . . . . . . . . . . . . 8
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
Observation of upstream loss, reorder, and round-trip time is crucial
to diagnosing issues on the network. With TCP, it is possible for an
on-path device to make estimation of such metrics by observing the
sequence number and the ACK packets being sent in clear. But with
QUIC, packet number is never used twice and ACK is encrypted, hence
such on-path observation has become difficult. There is also an
ongoing discussion about encrypting the packet numbers to avoid
ossification and also to miminize privacy concern. Such change will
make observation even more challenging.
There have been proposals to include signals in each QUIC packet that
conveys enough information for diagnosis but does not cause
ossification nor privary issues. However, it is difficult if not
impossible to figure out an approach that will work well for the
lifetime of a transport protocol.
This memo proposes an alternative solution. In the proposal, an on-
path device willing to obtain the performance metrics of a QUIC path
sends a query to the server, and the server responds with the
necessary information to calculate such metrics.
There are three primary benefits in the approach:
o Observation becomes an active action rather than passive, giving
the endpoints a chance to record observation attempts as well as
rejecting undesirable ones.
o Observation becomes accurate due to the endpoints' knowledge of
what is being exchanged encypted.
o Flexibility against issues (both performance- and privacy-related)
that might arise in the future, since bits for observation no
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Internet-Draft quic-perf-metrics February 2018
longer exists hard-coded in each packet. The metrics protocol can
evolve indenpendently to the QUIC transport protocol.
2. Overview
An on-path device that is willing to query the performance metrics of
a QUIC path sends a METRICS packet of subtype REQUEST to the server-
side endpoint of the path.
When receiving the request packet, A QUIC server sends a response to
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