Masaki Hirabaru<masaki@crl.go.jp>

CRL, Japan

APAN Engineering Team Meeting

APAN 2003 in Busan, KoreaAugust 27, 2003

Common Performance Measurement Platform

Real Situations

• MIT Haystack – CRL Kashima e-VLBI Experiment on June 27, 2003 to measure UT1-UTC in 24 hours– 41.54 GB CRL MIT 107 Mbps (~50 mins)

41.54 GB MIT CRL 44.6 Mbps (~120 mins)– RTT ~220 ms, UDP throughput 300-400 Mbps

However TCP ~6-8 Mbps (per session, tuned)– BBFTP with 5 x 10 TCP sessions to gain performance

• HUT – CRL Kashima Gigabit VLBI Experiment

- RTT ~325 ms, UDP throughput ~70 MbpsHowever TCP ~2 Mbps (as is), ~10 Mbps (tuned)

- Netants (5 TCP sessions with ftp stream restart extension)

They need high-speed / real-time / reliable / long-haul high performance data transfer.

Purpose

• Ensure ~1 Gbps end-to-end performance in high bandwidth-delay product networks– to support for networked science applications– to help operations in finding a bottleneck– to evaluate advanced transport protocols (e.g. Tsu

nami, SABUL, TFRC, HSTCP, FAST, XCP, ikob)

　

KwangjuBusan

2.5G

Fukuoka

Korea

                                       

2.5G x1

KORENTaegu

Daejon

2.5G + 40G

0.6G1Gx2

1Gx2

QGPOP

Seoul XP

Genkai XP

Kitakyushu

Tokyo XP

CRL Kashima

0.1G

Fukuoka Japan

250km

1,000km

2.5G + 1G x2

TransPAC

10,000km

4,000km

Los Angeles

Chicago

New York

MIT Haystack

HUT

10G

1G

APII/JGN

Abilene

0.1G?Helsinki

2.4G

Stockholm

0.6G

2.4G

2.4G

GEANT

Nordunet

funetCRL Koganei

1G

7,000km

Network Configuration (incl. near future plan)

Proposal• Place a “good” PC box for performance meas

urement at each NOC / POP as well as experiment sites (hop-by-hop and end-to-end)

• Advanced rate-based / window-based transports (kernel may be modified)

• Common measurement method / tool (iperf?)• Monitor for TCP / UDP protocol behavior (tcp

dump & tcptrace, packet loss detector)• Combine with ping, traceroute, routing stats• Share the boxes and develop scheduler to av

oid duplicate tests• Need a consensus to put a strong pressure o

n our networks (?)

Examples

DataUnavailable

DataUnavailable

From Tokyo XP to KOREN Busan Blue line: UDP (loss < 1%) better way Green area: TCP (with proper window size)

Traffic Between Genkai XP and KOREN Busan

Test stopped

Questions?• See

http://www2.crl.go.jp/ka/radioastro/index.htmlfor VLBI