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Transcript of RivuS
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RivuS
Stream Control Transmission Protocol(SCTP) on BSD
By-Jayesh Rane
Nitin Kumbhar
Kedar Sovani
PICT.
Guides: Prof. Rajesh B. Ingle, PICT.
Mr. Adityashankar Kini,
Calsoft Pvt.Ltd.
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RivuS Goals
Implementation of the entire SCTP protocol
in the network stack of 4.3 FreeBSD.
Implementation of Load Sharing extension
to SCTP for Performance gains.
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What is SCTP?
SCTP is Stream Control Transmission
Protocol, a Transport layer protocol.
SCTP is reliable data transfer protocol
which operates over the Network layer
protocol like IP.
UDPIP
PhysicalTCP SCTPApplications
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Why FreeBSD?
FreeBSD is Open source, freely available
Operating System.
FreeBSD is the most well documented,
structured and secure OS.
FreeBSD has maximum number of
Licenses available.
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RivuS Applications
SCTP is general purpose Transport layer
protocol, so it is used in all applications
which run on normal TCP giving moreremarkable advantages like Availability,
Security, Performance gains.
RivuSLoad Sharing, is useful for all theData intensive applications, Real Time
Video Audio server applications.
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Advantages of SCTP over TCP
No Head of line Blocking
Resistance to Denial of Service Attacks
Support for Multi-Homing
Message-Oriented Nature
Partial Ordered Data Transfer
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Head of line blocking
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Features of SCTP
Multi-Streaming
Multi-Homing
Four-way Handshake Association Initialization Chunk Bundling
Partial Order Delivery of data
Packet Validation Path & Peer Monitoring
Shutdown Feature
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Multi-Streaming
different streams within one SCTP
association.
sequence of messages maintained per
stream, which reduces unnecessary head-of-
line blocking.
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Multi-Homing
Multihomed nodes are the nodes which can
be reached under several IP addresses.
Network level fault tolerance
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Association Initialization
Endpoint A Endpoint Z
Create TCB
Generate INIT
Start T1-init timer Create temp. TCB
Create cookie
Send INIT ACK
Delete temp. TCB
Stop T1-init timer
Send COOKIE ECHO
Start T1-cookie timer accept valid cookiesend COOKIE ACK
Create TCB
Stop T1-cookie timer
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Chunk Bundling
SCTP Packet Format
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Shutdown Procedure
Endpoint A Endpoint Z
Send SHUTDOWN
Start shutdown timer
Send SHUTDOWN ACK
Start shutdown timer
Stop shutdown timer
Send SHUTDOWN COMPLETEDelete TCB
Stop shutdown timer
Delete TCB
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Streaming Context
Web Server
over SCTPWeb Client
Request for HTTP
Streaming Objects
Loss/Latency Feedback
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RivuSLoad Sharing
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Load Sharing
Exploiting Multihoming feature of SCTP to
gain performance, increase scalability,
availability and provide user transparency. Performance figures show that we gain very
high performance in data intensive transfers
using our concept of multiplexing data on todifferent paths.
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Load Sharing Concept
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Load Sharing Design
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Gain in performance using
RivuS Since our current
implementation is in
user space, we aregetting 32% gain in
data transfer, after we
put it in the kernel
space, we claim,performance gains of
70% to 80%.
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Other approaches
Ciscos Channel Bonding
Channel bonding is implemented by binding
several Network Interface Cards (NICs) with thesame MAC address. The higher layers of thenetwork stack could be oblivious to the fact thatthe lower level packets were going out (andcoming in) on different NICs.
Sun Microsystems IP Multipathing
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Why RivuS is better than
others? The channel bonding approach is limited to data
link layer and some major hardware changes are
need to be done at both the ends. The IP Multipathing solution is non-portable, I.e.
it works only on Solaris 8.0
RivuS is portable solution with minimal changes
to existing installations and more performance is
achieved.
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Future work on RivuS
Gaining extreme data integrity from data
redundancy between the paths.
RivuS, implementation of SCTP protocol stack onBSD is the first implementation, other
implementation by Cisco Inc. is UDP style, it
doesnt support Connection oriented nature which
SCTP protocol should support inherently. So wehave to get our implementation approved by IETF
group.
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RivuS
Thank You !!!
Jayesh RaneNitin Kumbhar
Kedar Sovani
Visit us:
http://rivus.sourceforge.net/