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OWAMP March 10 th 2011, OSG All Hands Meeting, Network Performance Jason Zurawski – Internet2
Tutorial Agenda: – Network Performance Primer - Why Should We Care? (15 Mins) – Getting the Tools (10 Mins) – Use of the BWCTL Server and Client (30 Mins) – Use of the OWAMP Server and Client (30 Mins) – Use of the NDT Server and Client (30 Mins) – Diagnostics vs Regular Monitoring (30 Mins) – Network Performance Exercises (1 hr 30 Mins) Agenda 2 – 5/5/2015, © 2010 Internet2
OWAMP is: – Command line client application – Policy and scheduling daemon – Used to determine one way latencies between hosts. Implementation of the OWAMP protocol as defined by http://www.rfc-editor.org/rfc/rfc4656.txt http://www.rfc-editor.org/rfc/rfc4656.txt – Command Protocol to speak between client and server, server and server – Test protocol Different attempts to do this in the past: – Surveyor – RIPE OWAMP: What is it 3 – 5/5/2015, © 2011 Internet2
Passive Measurements (e.g. SNMP) – Higher polling interval may mask queue depths – Active probing gives a better picture of real traffic Round Trip Measurements: – Hard to isolate the direction of a problem – Congestion and queuing can be masked in the final measurement – Can be done with a single ‘beacon’ (e.g. using ICMP responses) One Way Measurements: – Direction of a problem is implicit – Detects asymmetric behavior – See congestion or queuing in one direction first (normal behavior) – Requires ‘2 Ends’ to measure properly Why One Way Latency? 4 – 5/5/2015, © 2011 Internet2
Supports authentication and authorization of the users that will test Used to configure the parameters of a test – Endpoint controlled port numbers – Extremely configurable send schedule – Configurable packet sizes Used to start/stop tests Used to retrieve results – Provisions for dealing with partial session results in the event of a failure OWAMP Control Protocol 5 – 5/5/2015, © 2011 Internet2
“Lightweight” compared to the control protocol Uses UDP as the transport protocol, since the protocol needs to be able to measure individual packet delivery times Supports varying packet sizes Data needed to calculate experimental errors on the final result is in every packet Packets can be “open”, “authenticated”, or “encrypted” OWAMP Test Protocol 6 – 5/5/2015, © 2011 Internet2
Applications – Daemon (owampd) – Clients (owping, powstream) Open Source License & Development – Modified BSD ( http://www.internet2.edu/membership/ip.html ) http://www.internet2.edu/membership/ip.html – Mailing lists for developer communication – come join us! Protocol Abstraction Library – Will support development of new clients – Add custom ‘hooks’ into the policy (e.g. add authentication via OpenID or similar) Sample Implementation 7 – 5/5/2015, © 2011 Internet2
Meant to operate like traditional “ping” owping client requests OWD tests from an OWAMP server (owampd) Client can be ‘sender’ or ‘receiver’ – Both directions are tested unless otherwise specified Communication can be “open”, “authenticated”, or “encrypted” Supports the setup of many tests concurrently Supports the storage of results on the server for later retrieval Functionality (owping client) 8 – 5/5/2015, © 2011 Internet2
Accepts requests for OWD tests Responds with accepted/denied Tests are formally started with a StartSessions message from the client. Runs tests Sessions with packets received at the server are buffered for later retrieval Functionality (owampd server) 9 – 5/5/2015, © 2011 Internet2
OWPING Example 10 – 5/5/2015, © 2011 Internet2
OWAMP GUIs - Mesh 11 – 5/5/2015, © 2011 Internet2
OWAMP GUIs – Delay/Loss Plot 12 – 5/5/2015, © 2011 Internet2
OWAMP GUIs - Jitter 13 – 5/5/2015, © 2011 Internet2
Each connection is “classified” (authentication) Each classification is associated with a set of hierarchical limits – Bandwidth (bandwidth) – Session buffer (disk) – Data retention (delete_on_fetch) – Connection policy (allow_open_mode) (no time dependent dimension to resource allocation in owampd) Resource Allocation 14 – 5/5/2015, © 2011 Internet2
Architecture 15 – 5/5/2015, © 2011 Internet2
Clock requirement is the strongest – Doesn’t work well in virtualized environments – Doesn’t work well when machine is doing heavier testing (e.g. BWCTL), results may be suspect NTP (ntpd) synchronized clock on the local system – Specific configuration requirements as specified in NTP talk… – Strictly speaking, owamp will work without ntp. However, your results will be meaningless in many cases OWAMP Requirements 16 – 5/5/2015, © 2011 Internet2
NTP (ntpd) synchronized clock on the local system – Configure NTP properly (don’t rely on system defaults!) – Strictly speaking, owamp will work without NTP. However, your results will be meaningless in many cases – More info here: http://www.internet2.edu/performance/owamp/details.html#NT P http://www.internet2.edu/performance/owamp/details.html#NT P General Requirements – Time Source 17 – 5/5/2015, © 2011 Internet2
Source Code – All modern Unix distributions (Free BSD/Linux) – OS X Packages – Support for CentOS 5.5 (x86) – Packages have been shown to operate on similar systems (CentOS, Fedora, RHEL, and x86_64 architecture) General Requirements – Support 18 – 5/5/2015, © 2011 Internet2
“Bare Metal” – virtualization is tricky Stable System Clock – Temperature controlled environment – No power management of CPU – Reduction of “background” services – may institute noise No strict requirements for CPU, Memory, Bus speed – More tasking schedules will require more capable hardware Hardware 19 – 5/5/2015, © 2011 Internet2
Time: – NTP issues predominate the problems – Determining an accurate timestamp “error” is in many ways more difficult than getting a “very good” timestamp – Working as an “open” server requires UTC time source (For predefined test peers, other options available) Firewalls: – Port filter trade-off Administrators like pre-defined port numbers Vendor manufactures would probably like to “prioritize” test traffic Owampd allows a range of ports to be specified for the receiver Operational Concerns 20 – 5/5/2015, © 2011 Internet2
Third-Party DoS source – Compromised server may send packets to other locations. DoS target – Excessive traffic will harm measurement results – Someone might attempt to affect statistics web pages to see how much impact they can have Resource consumption – Time slots – Memory (primary and secondary) – Network bandwidth Policy/Security Considerations 21 – 5/5/2015, © 2011 Internet2
Restrict overall bandwidth to something relatively small – Most OWAMP sessions do not require much Limit “open” tests to ensure they do not interfere with precision of other tests Policy Recommendations 22 – 5/5/2015, © 2011 Internet2
Currently available – http://www.internet2.edu/performance/owamp – http://www.software.internet2.edu Mail lists: – https://lists.internet2.edu/sympa/info/owamp- users https://lists.internet2.edu/sympa/info/owamp- users email@example.com – https://lists.internet2.edu/sympa/info/owamp- announce https://lists.internet2.edu/sympa/info/owamp- announce firstname.lastname@example.org Availability 23 – 5/5/2015, © 2011 Internet2
Testing OWAMP: – Log on to testbed – Test from one host to another: owping HOSTNAME – Try different hosts. Try longer tests. What happens when we use: -c (number of packets to send, try 1000) -t (test to HOSTNAME only) -f (test from HOSTNAME only) Hands On 24 – 5/5/2015, © 2011 Internet2
OWAMP March 10 th 2011, OSG All Hands Meeting, Network Performance Jason Zurawski – Internet2 For more information, visit http://www.internet2.edu/workshops/npw 25 – 5/5/2015, © 2011 Internet2
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