1. Support for high performance UDP/TCP applications
Xing Li

2. Background
More and more demonstration and trials on high-performance applications
Application-specific stream or data
Consume large network bandwidth
Heavily rely on network support
What can NOC do to support for it?
If there is a lambda path
lucky!
RTT is still an issue
Otherwise
Measurement and monitoring
Network performance measurement tool
Application-specific measurement tools
End to end performance guarantee
Inter-AS routing adjustment
Agreement on enabling application-related ACLs

3. Where are the bottlenecks?
AS2
AS3
AS1
access
Bad cabling
Wrong speed
Wrong duplex mode
firewall
Bandwidth bottleneck
Host
parameters

4. Possible Paths

5. Case study In KR It is not via the CERNET – KR path
It is not via the CERNET– APAN – KR path
It is not via the CERNET – TEIN2 – KR path
It is not via the CERNET – TEIN2 – JP – KR path
It is via the CERNET – APAN – Abilene – KR path
And the return path may be totally different

6. The Ideas Use measurement tools to Help users to do self-service
Separate the network problems from the end system problems
Find the network segments which cause the problem

7. SASM Framework

8. The operation modes of basic tools

9. Server discovery and registration

10. From Arlington to TEIN2 Beijing server
using WALN Not good
using RJ45 Good

11. TCP transfer speed
Formula
Theory
SUN §WINDOWS

12. The TCP measurement Tool

13. The testing steps Default test Window size test Parallel session test
The default TCP transfer speed for the e2e peer
Window size test
Check the client window
Parallel session test
Check the server window
Physical speed limit
Comparison with ping and UDP (dvping) tests
Check packet loss (ping and dvping)
Check RTT (ping and dvping)
Check throughput (dvping)

14. Comparison with UDP (dvping)
Compare with UDP (dvping)
Check RTT, packet loss and the physical speed limit

16. Summary of the TEIN2 NOC measurement servers
clinet
ICMP
U/UDP
M/UDP
U/TCP
ping
ssmping
dvping
iperf –c
smjoin
iperf –s
smclock
dvmcast
ssmpingd
Socket stack
U – Unicast
M - Multicast

17. TEIN2 Measurement Server Locations
CERNET
TEIN2

18. SASM Framework

19. A Document
Login: tein2 passwd: tein2

20. eVLBI example

21. Summary Application specific tools Distributed servers alone the path
dvping (UDP)
iperf (TCP/UDP)
Distributed servers alone the path
Scalable Application Specific Measurement (SASM)
Open traffic monitoring
SNMP
Netflow
Applications
TCP vs. UDP
International collaboration