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Moch

HWS 2007Universität Mannheim

Seminar: „Ausgewählte Themen aus Optik und Rechnerarchitektur“

Page 2: Übersichtra.ziti.uni-heidelberg.de/pages/student_work/seminar/hws07/Christian_Moch/... · Übersicht Historisches Grundlagen Netzwerke Switching Routing Flusskontrolle Infiniband

Übersicht� Historisches

� Grundlagen Netzwerke� Switching

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06.11.20072 Christian Moch

Page 3: Übersichtra.ziti.uni-heidelberg.de/pages/student_work/seminar/hws07/Christian_Moch/... · Übersicht Historisches Grundlagen Netzwerke Switching Routing Flusskontrolle Infiniband

Historisches - Infiniband� Zusammenschluss zweier Projekte

� „Future I/O“ (Compaq, IBM, HP)

� und „Next Generation I/O“ (Intel, Microsoft, Sun)

� Ziel: Entwicklung eines neuen I/O Systems

06.11.20073 Christian Moch

Page 4: Übersichtra.ziti.uni-heidelberg.de/pages/student_work/seminar/hws07/Christian_Moch/... · Übersicht Historisches Grundlagen Netzwerke Switching Routing Flusskontrolle Infiniband

Historisches - Myrinet� Wurde speziell als Interconnect entwickelt

� 1998 Myrinet-2000� Kompatibel zu 1Gbit Ethernet

� 2006 Myri-10G� Kompatibel zu 10 Gbit Ethernet (10 Base CX4)� Kompatibel zu 10 Gbit Ethernet (10 Base CX4)

Myricom.com

06.11.20074 Christian Moch

Page 5: Übersichtra.ziti.uni-heidelberg.de/pages/student_work/seminar/hws07/Christian_Moch/... · Übersicht Historisches Grundlagen Netzwerke Switching Routing Flusskontrolle Infiniband

Historisches - Ethernet

06.11.20075 Christian Moch

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Grundlagen - Netzwerke� Switching

� Store and Forward Switching

� Virtual Cut Through Switching

� Wormhole Switching

06.11.20076 Christian Moch

Page 7: Übersichtra.ziti.uni-heidelberg.de/pages/student_work/seminar/hws07/Christian_Moch/... · Übersicht Historisches Grundlagen Netzwerke Switching Routing Flusskontrolle Infiniband

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06.11.20077 Christian Moch

Page 8: Übersichtra.ziti.uni-heidelberg.de/pages/student_work/seminar/hws07/Christian_Moch/... · Übersicht Historisches Grundlagen Netzwerke Switching Routing Flusskontrolle Infiniband

Grundlagen – Netzwerke� Flusskontrolle

� Pakete verwerfen

� STOP / GO Nachrichten

� Credit based

06.11.20078 Christian Moch

Page 9: Übersichtra.ziti.uni-heidelberg.de/pages/student_work/seminar/hws07/Christian_Moch/... · Übersicht Historisches Grundlagen Netzwerke Switching Routing Flusskontrolle Infiniband

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06.11.20079 Christian Moch

Page 10: Übersichtra.ziti.uni-heidelberg.de/pages/student_work/seminar/hws07/Christian_Moch/... · Übersicht Historisches Grundlagen Netzwerke Switching Routing Flusskontrolle Infiniband

Infiniband� Switching

� Virtual Cut Through� Service Levels (SL)� Virtual Lanes (VL)

� Routing � Table Based

06.11.2007Christian Moch10

� Table Based� Locale Route Header 8 Byte

� LID 16 Bit� Global Route Header 40 Byte

� IPv6

� Flusskontrolle� Credit based

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Infiniband Paketformat

• Local Route Header 8 ByteLRH• Global Route Header 40 Byte

[Optional] GRH

BTH

06.11.2007Christian Moch11

• Base Transport Header 12 ByteBTH

• Bis zu 4096 BytePayload

• 4 Byte + 2 ByteCRC

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Infiniband Paketformat

LRH

06.11.2007Christian Moch12

Virtual Lane

4 Bit

Link Version

4 Bit

Service Level

4 Bit

Res.

4 Bit

LNH

2 Bit

LID

16 Bit

Res.

5 Bit

Packet Length

11 Bit

SLID

16 Bit

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Infiniband Paketformat

BTHSolici Tran

06.11.2007Christian Moch13

Opcode

8Bit

Solicited

Event

1Bit

MigReq

1Bit

PCount

2Bit

Transport Head

er

4Bit

PKEY

16Bit

Res

8Bit

DQP

24Bit

ACK

1Bit

Res

7Bit

PSQ

24Bit

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Infiniband - Paketoverhead

1 Byte Nachricht 1500 Byte Nachricht

� 8 Byte LRH

� 12 Byte BTH

� 1 Byte Nachricht

� Summe: 1526 Byte

4 KByte Nachricht

� Summe: 4122 Byte

06.11.2007Christian Moch14

� 1 Byte Nachricht

� 4 + 2 Byte CRC

� Summe 27 Byte

� Summe: 4122 Byte

4 MByte Nachricht

� Summe: 4,122 Mbyte

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Bitübertragung - Infiniband� Basiert auf 1 Gbit Ethernet (802.3z)

� Mit höherer Bitrate 2,5 Gbit/s SDR, 5Gbit/s DDR

� Besser geschirmte Kabel

� 8B/10B Kodierung

06.11.2007Christian Moch15

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Infiniband - Besonderheiten� RDMA-read/RDMA-write Operation

� Atomic Operation

� Speicherzugriffsrechte per Remote Host� Nur lesen

� Lesen/Schreiben

06.11.2007Christian Moch16

� Lesen/Schreiben

� kann virtuelle in physikalische Adresse umsetzen

� Kein Wechsel zw. Betriebssystem und Benutzerkontext nötig

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Myrinet� Auf physikalischer Ebene kompatibel zu Ethernet

� Myrinet-2000 <-> Gigabit Ethernet

� Myri-10G <-> 10 Gigabit Ethernet

� Dual Protokoll� Kann als Ethernet oder Myrinet eingesetzt werden

06.11.2007Christian Moch17

� Kann als Ethernet oder Myrinet eingesetzt werden

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Myrinet� Switching

� Wormhole

� Routing� Source Path

� CRC wird an jedem Knoten neu berechnet

06.11.2007Christian Moch18

� CRC wird an jedem Knoten neu berechnet

� Paketaufbau

[3]

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Myrinet - Paketoverhead1 Byte Nachricht über 10 Vermittlungsstellen

1500 Byte Nachricht über 10 Vermittlungsstellen

� 10 + 4 Byte Header

� 1 Byte Nachricht

� 1 Byte CRC

� Summe: 1516 Byte

4 KByte Nachricht über 10 Vermittlungsstellen

06.11.2007Christian Moch19

� 1 Byte CRC

� 1 Byte GAP

� Summe 17 Byte � Summe: 4112 Byte

4 MByte Nachricht über 10 Vermittlungsstellen

� Summe: 4,00001525 MByte

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Myrinet - Flusskontrolle� STOP Message

� Jeder Knoten kann Annahme einer Nachricht verhindern

� Nur Puffer für „Bytes on the fly“ nötig

� GO Message sobald Puffer wieder frei

06.11.2007Christian Moch20

� GO Message sobald Puffer wieder frei

[7]

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Bitübertragung – Myri-10G� 8B / 10 Bit Kodierung

� 8-paariges IB4X-Kabel� 1250 MHz

� Entfernung von 15m

06.11.2007Christian Moch21

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Myrinet - Besonderheiten� Low level message passing

� GM – am häufigsten benutzt

� MX (Myrinet Express)

� MPI effektiv über GM und MX nutzbar

� OS Bypass über Sockets

06.11.2007Christian Moch22

� OS Bypass über Sockets

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10 GB-Ethernet� Switching

� Virtual Cut Through Switching

� Quality of Service

� Routing� Table Based Routing� Table Based Routing

� 48 Bit MAC Adresse

� Virtuelle LANs

� Flusskontrolle� STOP Nachrichten

� Optional Go Nachrichten

06.11.200723 Christian Moch

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10 GB-Ethernet - Paketformat

06.11.2007Christian Moch24

[5]

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10-Gbit Ethernet - Paketoverhead

1 Byte Nachricht 1500 Byte Nachricht

� 7 Byte Sender-MAC

� 7 Byte Empfänger-MAC

� Summe 1524 Byte

4 KByte Nachricht

06.11.2007Christian Moch25

MAC

� 4 Byte VLAN-Tag

� 2 Byte Typ-Feld

� 1 Byte Nachricht

� 43 Byte PAD-Füllfeld

� 4 Byte CRC

� Summe 68 Byte

� Summe 4168 Byte

4 MByte Nachricht

� Summe 4,07202 MByte

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Bitübertragung – 10GB-Ethernet� Kabel

� Cat 6� Nur bis 250 MHz freigegeben

� Für 10GB nicht ausreichend

� Cat 6a

06.11.2007Christian Moch26

Cat 6a � Bis zu 100m

� Freigegeben bis zu 625MHz

� Cat 6e� Bis zu 55m

� Freigegeben bis zu 500 MHz

[2]

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Bitübertragung – 10GB-Ethernet

� Kodierung

� Scrambler [3]

06.11.2007Christian Moch27

Scrambler� Verwürfelt die Datenblöcke

� Erzeugt ein rauschähnliches Signal

� Längere Null- bzw. Einsfolgen werden verschleiert

� Datenströme auf den Adernpaaren unterscheiden sich

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Bitübertragung – 10GB-Ethernet

[3]

Low Density

06.11.2007Christian Moch28

� Low DensityParity Check

� 1723 Datenbits

� 325 Checkbits

� => 15% Overhead

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Bitübertragung – 10GB-Ethernet� Kodierung

128 Double SQuare-Map

[3]

06.11.2007Christian Moch29

� 128 Double SQuare-Map� zwei gegeneinander versetzte 16 PAM

Konstellationen

� 7Bit pro Symbol

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Bitübertragung – 10GB-Ethernet

10

15

PAM-16

06.11.2007Christian Moch30

0

5

0

PAM-16

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Bitübertragung – 10GB-Ethernet

10

15

2D - PAM-16

06.11.2007Christian Moch31

0

5

0 2 4 6 8 10 12 14

2D - PAM-16

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Bitübertragung – 10GB-Ethernet

10

15

128 DSQ

06.11.2007Christian Moch32

0

5

0 2 4 6 8 10 12 14

128 DSQ

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Bitübertragung – 10GB-Ethernet

128 – DSQ3 Uncoded Bits:-Großer Abstand-Daher keine Fehlerkorrektur

06.11.2007Christian Moch33[2]

4 Coded Bits:- Durch LDPC gesichert

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Bitübertragung – 10GB-Ethernet

06.11.2007Christian Moch34

[2]

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Bitübertragung – 10GB-Ethernet� Kodierung

Tomlinson-Harashima Precoding (TH-Precode)[3]

06.11.2007Christian Moch35

� Tomlinson-Harashima Precoding (TH-Precode)� Verhindert große Signalsprünge am Ausgang

� Überprüft wie hoch das nächste Signal ist� Falls zu hoch, wird per Modulo reduziert

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Vergleich10 GB Ethernet Myrinet Infiniband

Switching Virtual Cut Through

Wormhole Virtual Cut Through

Routing Table based Source Path Table based

Flusskontrolle STOP / GO STOP / GO Credit based

Switch Latenz 500ns-10µs 200ns 140ns – 420ns

06.11.2007Christian Moch36

Switch Latenz 500ns-10µs 200ns 140ns – 420ns

Overhead - ++ +

Kosten + - -

RDMA Nein Ja Ja

AtomicOperations

Nein Nein Ja

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Performance Messung

06.11.2007Christian Moch37

Quelle: www.ra.informatik.uni-mannheim.de

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Performance Messung

06.11.2007Christian Moch38

Quelle: www.ra.informatik.uni-mannheim.de

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Top 500� Stand Juni 2007 (www.top500.org)

� Myrinet 6.20 %

� Gigabit Ethernet 41.20 %

� Infiniband 10.20 %

� Infiniband DDR 11.00 %

06.11.2007Christian Moch39

� Infiniband DDR 11.00 %

Myrinet Gigabit Ethernet

Infiniband Infiniband DDR

Other

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Ausblick� 100 Gbit Ethernet ist gerade in der Entwicklung

� Voraussichtlich 2009 standardisiert

� Infiniband und Myrinet werden vermutlich nachziehen

� Bisheriger Trend: Steigerung um Faktor 10

06.11.2007Christian Moch40

� Bisheriger Trend: Steigerung um Faktor 10 innerhalb von ~ 6 Jahre� Zwischenschritte wurden bislang abgelehnt

� 2,5 Gbit/s Ethernet wurde nicht standardisiert

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Literaturverzeichnis� [1] The Ethernet Evolution – Hadrial Kaplan, Bob Noseworthy

� [2] Heise Netze – 10Gigabit pro Sekunde über Kupfer (http://www.heise.de/netze/artikel/96475/3) Letzter Zugriff 13.10.2007

� [3] Myrinet: A Gigabit-per-Second Local Area Network, Nanette J. Boden

� [4] Overview of Common Interconnects for Commodity Clusters, GelatoICE Conference, Doug Johnson

� [5] Roland Wismüller, Univ. Siegen, Skript Rechnerarchitektur II

� [6] Overview of 10G Ethernet Family, David Law/3Com, Knoxville 2006

� [7] An Overview of 10GBASE-T - Paul Langner, Bill Woodruff

� [8] Infiniband Architecture Development and Deployment – William T. Futral – 2001 – Intel Press ISBN 0-9702846-6-7

06.11.200741 Christian Moch

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Literaturverzeichnis� [9] InfiniBridgeTM: An Integrated InfiniBand Switch and ChannelAdapter

Chris Eddington, Director of Technical Marketing Mellanox Technologies

� [10] Myrinet-on-VME Protocol Specification Draft Standard

� [11] IEEE Std 802.3an™-2006

� [12] 10GBASE-T Coding and Modulation:128-DSQ + LDPC, Gottfried Ungerboeck

06.11.2007Christian Moch42

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