ATM WAN Experiences with Command and Control & High-Performance Computing Applications at NCCOSC RDT&E Div

Transcription

1 ATM WAN Experiences with Command and Control & High-Performance Computing Applications at NCCOSC RDT&E Div DARPA Workshop on Wide-Area ATM Performance University of Kansas June 1996 Mark Ganzer

2 AAI Applications at NCCOSC Command and Control High Performance Computing Distributed Simulation

3 Command and Control Applications Satellite Imagery Transfers from EDC JWID 94 JWID 95 Videoconferencing PictureWindow/NCSA Collage (JWID 94) Communique/MMslide (GETS demo) Communique between NCCOSC/ARPA (3/95) Mbone Tunnels between NCCOSC and ARL AT&T Initial test (3/95) NCCOSC to DARPA VTC s and demos (1/96 - )

4 JWID 94 Satellite Imagery Transfers from EROS Data Center PVC s between NCCOSC, NRL, EDC NCCOSC host : Sparc 10 running SunOS Maximum data rate (ftp) ~ 1.8 Mbps NCCOSC - EDC vs. local ftp transfers of Mbps FTP via open Internet still took much longer, however still much room for improvement. TCP window size limited transfer speed. JWID 95 Limited to running image viewer remotely using X protocol

5 Videoconferencing Video over TCP/IP BBN PictureWindow ( < 1 Mbps) NRaD to NRL for JWID 94 Insoft Communique (~ 1Mbps) GETS demo (Oct 94) NRaD to ARPA trials Throughput limited by workstations, not network Multicast IP Limited to tunnels due to lack of multicast support in RFC 1577 Native ATM (AT&T ) Throughput is network-limited, can overdrive DS-3

6 AT&T TEST (3/95) Camera TV Monitor video out video in audio in AT&T VHS Player video out AT&T audio out OC-3 Audio Speakers ATM Switch SynOptics OC-3 LattisCell SynOptics LattisCell ATM Switch OC-3 OC-3 AT&T AT&T audio out video in video out audio in Camera TV Monitor Microphone NRaD ATM Switch Box Test / Demo NRaD Code 41 Advanced Network Technology Group AT&T Thursday, 2 March 95 Ken Boyd (NRaD 4121) Mark Ganzer (NRaD 4123) Marc Beacken (AT&T) OC-3 DS3 NRaD ATM Network AAI ATM Network DS3 = 45 Mbps OC-3 = 155 Mbps DS3 Audio Speakers NRL ATM Switch CD-ROM Test #1: Bi-directional Audio and Video over a ATM LAN between two s Test #2: Bi-directional Audio and Video between two s over a ATM WAN (AAI) with a loopback at NRL loopback

7 NRaD - DARPA Configuration DARPA "TIE" AT& T AT& T Command Center of the Future AT& T AT& T ASX- 200 NRaD ATM Backbone ASX- 200 DS-3 AAI DS-3 ASX- 200 ATDnet OC-3c aai-pop.nccosc.aai.net aai-pop.nrl.aai.net OC-3 ASX- 200 AT& T AT& T nrl-wabit

8 Performance Video is over AAL 5. Bandwidth determined by JPEG compression factor and complexity of original image ~ 12 Mbps for 75% compression Audio is over AAL 1 (44 khz 16 bit sampling). Constant 1.85 Mbps Observations: Keeping PVC s up between sessions has been problem Can easily over-run DS-3 circuit Still only point-to-point conferencing

9 High-Performance Computing NRaD HPC machines Unclassified - Convex Exemplar Not yet reachable via AAI due to lack of necessary hardware Classified node - Intel Paragon Supercomputing 95 Extended virtual LAN from NRaD to provide access to Exemplar, Paragon (running unclassified), and general internet access via IDREN AAI access for DoD HPC booth demos to NRL, CEWES, ARL Attempted to monitor network traffic using ForeView

10 Supercomputing 95 NCCOSC - DoD HPC Exhibit Connectivity NRaD Bayside FDDI Intel Paragon Convex Exemplar FDDI Ring Router NRaD FDDI backbone NetEdge Router NRaD ATMARP server OC-3c IDREN Router IDREN, Internet (via FIX) OC-3c NRaD ATM Backbone PVP BX Exemplar Lab OC-3c NRaD AAI-POP DS-3 CEWES, NRL, NRL Stennis Fore LAX-20 Router NCCOSC-DoD HPC booth OC-3c NCCOSC-DoD HPC booth Convention Center PVP AAI (Sprint ATM) OC-3c 2x OC-3c NRL ATMARP server ethernet hosts (NRaD subnet) FDDI hosts (NRaD subnet) ATM hosts (NRaD & AAI subnets) BX "Sprint" switch Convention center Kansas City ATMARP server

11 Supercomputing 95 - Observations Most time spent dealing with network connectivity issues, so WAN optimization of TCP/IP on workstations did not happen. ForeView was useful for observing network traffic in realtime, however it has no decent way to capture this data for later analysis.

12 Performance Issues to Date TCP/IP on Workstations not Optimized for Long Fat Networks SunOS lack large TCP windows Solaris 2.4 LFN patch, SGI config not documented No LFN patch yet for Solaris 2.5 HP workstation capability? Too much effort/skill required for this optimization WAN performance optimizations could have adverse affect on LAN performance (?) Native ATM videoconferencing using AT&T has been extremely useful. However: Wants to have QOS capability for audio PVC PVC management across WAN is an issue. Still not as simple as dialing the telephone Future: SVC s with QOS