Current Projects T Improving Performance of Classical IP between - PDF document

Status Report -- Gigabit Kits Oakland University Gigabit Netw ork Technology Workshop July 10-11, 2000 Current Projects T Improving Performance of Classical IP between APIC adapter cards T High Speed DMA Tests with the APIC adapter cards T Distributed Processing Using PVM and MPI 1

Can Performance of Classical IP over ATM be Improved? T Experimental date presented at last workshop showed: S maximum data rate surprisingly low S data rate sensitive to record length. T Experiments used the default send and receive buffer sizes. T Can larger socket buffer sizes improve performance? Hardw are Configuration netlab2 netlab3 netlab4 450 MHz 450 MHz 450 MHz NetBSD Linux NetBSD 1.2 Gbps ATM pathclient pathserver 1.2 Gbps ATM 1.2 Gbps ATM WUGS-20 Classical TCP/IP 2

Description of Experiment T Send and receive buffer lengths vary over the set { 65535 49142 32768 16384 8192 4096} (Send and receive buffers are the same length) T Packet data lengths vary over the same set. T 100 packets are sent at each of the 36 length pairs. Sequence of Events T Server is started and waits for requests. T Client is started and sends request parameters to the server. T Server spawns a child to interact with client through a TCP/IP session. T Session ends with statistical report from client, both human and machine readable. T Client and server child both terminate. T Server parent waits for another client. 3

Sequence of Events Server Client Server clone Fastest Data Rates (rw action -- request/response) Socket buffer length Packet length Data Rate bytes bytes Mb/s 65535 65535 300.064 49142 65535 287.331 49142 49142 266.639 32768 32768 231.849 49142 32768 231.786 65535 32768 231.785 65535 49142 227.832 32768 49142 169.122 4

Slow est Data Rates (rw action -- request/response) Socket buffer length Packet length Data Rate bytes bytes Mb/s 32768 65535 2.654 16384 65535 2.171 16384 32768 1.171 16384 49142 0.964 49142 16384 0.666 32768 16384 0.665 65535 16384 0.665 16384 16384 0.656 Fastest Data Rates (r action -- unicast) Socket buffer length Packet length Data Rate bytes bytes Mb/s 65535 65535 300.401 49142 65535 297.544 32768 32768 234.905 65535 32768 234.243 49142 32768 233.558 65535 49142 206.647 8192 8192 159.987 32768 49142 155.779 5

Slow est Data Rates (r action -- unicast) Socket buffer length Packet length Data Rate bytes bytes Mb/s 32768 65535 2.654 16384 65535 2.171 16384 32768 1.171 16384 49142 0.964 49142 16384 0.666 32768 16384 0.665 65535 16384 0.665 16384 16384 0.656 Classical IP Conclusions T Maximum expected data rate is 300Mb/s. T Actual data rate is sensitive to receive and transmit socket buffer sizes and packet sizes. T Most applications conform to the TCP API. T Using TCP data transfer is reliable. 6

High Speed DMA tests w ith the APIC T CSE 647 (Advanced Computer Communications) term project T Muthusamy Sivanantham, Rajeshree Vador, Mahitha Balasubramaniam, Ramya Raghavachar T Worked with Berkley Shands’ API Hardw are Configuration netlab2 netlab3 netlab4 450 MHz 450 MHz 450 MHz NetBSD Linux NetBSD 1.2 Gbps ATM DemoLibraryAAL5Read.debug DemoLibraryEndlessAAL5Read.debug 1.2 Gbps ATM 1.2 Gbps ATM WUGS-20 VCI 211 7

Performance (pacer clock at 256 cycles) T Data rate consistently at 94MB/s (752Mb/s) T Small number of samples at 81MB/s (648Mb/s) T Very small number of samples at 2MB/s (16Mb/s) T 409 buffers -- 36864 bytes Performance (Pacer clock at 8192 cycles) T Data rate consistently at 28.5 MB/s (228 Mb/s) T Very few samples at 2.6 MB/s (20.8 Mb/s) T 409 buffers -- 36864 bytes 8

Pacer clock sets CBR 94.3 MB/s 28.5 MB/s 256 cycles 8192 cycles APIC API Conclusions T APIC DMA yields consistently high performance compared to classical IP over ATM. (752Mb/s compared to 300Mb/s.) T No legacy applications conform to the APIC DMA API. 9

Next Step and status T Modify PVM and MPI to use the APIC API for APIC to Process DMA transfers. T We have just begun to work on these modifications. Another Alternative T Use native ATM API T Create virtual circuit with -paced < rate> option rather than -besteffort T Native ATM API is close to UDP/IP. T Paced may yield more reliable throughput than besteffort. T Performance should still lag compared to the APIC DMA API. 10

Other Projects T Load Visualizer for the ATM Switch T WUGS Performance Monitor T A Graphical User Interface for Jammer T Gather Statistics during near-overloading and overloading. Load Visualizer for the ATM Sw itch T CSE 647 (Advanced Computer Communications) term project T Vamsi Atluri and Naveen Nagaraja T A Java program which plots cell traffic for selected active virtual circuits in real time. T Interfaces with Greg Buchman’s program. 11

WUGS Performance Monitor T CSE 647 (Advanced Computer Communications) term project. T Ahmad Milhim, Ulvi Bucak, Caijian Pan, Tom Brusca T A Tcl/Tk and Perl program which produces barcharts showing virtual circuit activity in real time. T Interfaces with Greg Buchman’s program. A Graphical User Interface for Jammer T CSE 647 (Advanced Computer Communications) term project T Kennet DeMonn, Vilasita Malpeddi, Sridevi Thamma, Sudha Bhogaraju T A Java program which presents a GUI for Jammer. Jammer is executed each time via a system() like call. 12

Gather Statistics during near- overloading and overloading. T CSE 647 (Advanced Computer Communications) term project. T Yangsi Boppana, Mamta Maddireddy, Niloufer Mathew, Bob Person T Drove switch into near-overload condition and measured affect on cross-traffic. Current and Future Activities T Distributed computing using APIC DMA API with PVM and MPI. T Tunneling ATM over Internet2 using a tunnel based on udptunnel. T Scheduling and policing multimedia multicast and near-multicast streams. 13

Distributed Processing over Abilene/Internet2 APIC APIC APIC APIC I PC PC PC PC N T ATM Tunnel E R N E APIC APIC APIC APIC T PC PC PC PC 2 ATM Tunnel 14