DataTAG/WP7 Amsterdam June 2002 R. Hughes-Jones Manchester 1 QuickTime™ and aTIFF (Uncompressed) decompressora CdL was here EU DataGrid - Network Monitoring Richard Hughes-Jones, University of Manchester Thanks to a wireless connected Titanium in the garden@Houten
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EU DataGrid - Network Monitoring Richard Hughes-Jones, University of Manchester
EU DataGrid - Network Monitoring Richard Hughes-Jones, University of Manchester Thanks to a wireless connected Titanium in the garden@Houten. SURFnet. Manc. UvA. SuperJANET4. CERN. European Topology: NRNs & Geant. Gigabit Throughput on the Production WAN. Manc - RAL 570 Mbit/s - PowerPoint PPT Presentation
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DataTAG/WP7 Amsterdam June 2002R. Hughes-Jones Manchester
1
QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.
CdL was here
EU DataGrid - Network Monitoring
Richard Hughes-Jones, University of ManchesterThanks to a wireless connected Titanium in the
garden@Houten
DataTAG/WP7 Amsterdam June 2002R. Hughes-Jones Manchester
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QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.
CdL was here
European Topology: NRNs & Geant
SuperJANET4
CERN
UvA
Manc
SURFnet
DataTAG/WP7 Amsterdam June 2002R. Hughes-Jones Manchester
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QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.
CdL was here
Gigabit Throughput on the Production WAN
Manc - RAL 570 Mbit/s 91% of the 622 Mbit access link
between SuperJANET4 and RAL 1472 bytes propagation ~21s
Manc – CERN 460 Mbit/s CERN PC had a 32 bit PCI bus
DataTAG/WP7 Amsterdam June 2002R. Hughes-Jones Manchester
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CdL was here
Gigabit TCP on the Production WAN (01)
Throughput vs TCP buffer size
TCP window sizes in Mbytes calculated from RTT*bandwidth
Link RTT ms BW Measured by UDP
Expected BW for 1 Gbit/s
750 Mbit/s 460 Mbit/s
Man – Ams
14.5 1.81 1.36
Man – CERN
21.4 2.68 1.23
Window forBW 1 Gbit/s
Window Mbytes forUDP BW 750 Mbit/s 460 Mbit/s
DataTAG/WP7 Amsterdam June 2002R. Hughes-Jones Manchester
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CdL was here
Gigabit TCP on the Production WAN Man-CERN
Throughput vs n-streams Default buffer size slope = ~25 Mbit/s/stream up to 9 streams then 15 Mbit/s/stream With larger buffers rate of increase per stream is larger Plateaus at about 7 streams giving a total throughput of ~400 Mbit/s
DataTAG/WP7 Amsterdam June 2002R. Hughes-Jones Manchester
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CdL was here
UDP Throughput: SLAC - Man
SLAC – Manc 470 Mbit/s 75% of the 622 Mbit access link SuperJANET4 peers with ESnet
at 622Mbit in NY
DataTAG/WP7 Amsterdam June 2002R. Hughes-Jones Manchester
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CdL was here
Gigabit TCP on throughput Man-SLAC
Throughput vs n-streams Much less than for European links Buffer required: rtt*BW (622Mbit) = ~14 Mbytes With larger buffers > default, rate of increase per stream is ~ 5.4 Mbit/s/stream No Plateau
TCP Man-SLAC
0
20
40
60
80
100
120
140
160
0 2 4 6 8 10 12
Number of TCP streams
Received throughput Mbit/s
1048576
1600512
2097152
3145728
4194304
DataTAG/WP7 Amsterdam June 2002R. Hughes-Jones Manchester
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CdL was here
RiPE 1 wayUvA RAL ms
RiPE 1 wayRAL UvA ms
UDPmon Loss
ThroughputMbit/sMAN – UvA
~750Mbit/s
UDPmon & Ripe MAN-SARA from 25 May 02
DataTAG/WP7 Amsterdam June 2002R. Hughes-Jones Manchester
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