100 \s+2Interim Report on Operating Systems Research in the DASH and Berkeley UNIX Projects\s-2 January 1, 1989 - March 31, 1989 Susan L. Graham Domenico Ferrari David P. Anderson Marshall Kirk McKusick Michael J. Karels Keith Sklower

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\s+2DASH Project\s0 .pp We now have the ability to load files and programs from a UNIX-based server, and have a DASH shell running. We have demonstrated and measured two important system capabilities. First, we illustrate the channel architecture with demonstration in which two DASH hosts communicate streams of full-motion video intermixed with other traffic, over a 10 Mbps Ethernet. The correct video frame rate is maintained while other communication gracefully degrades. Second, the DASH VM system provides high-speed data movement between virtual address spaces using remapping. A study of its performance has shown that it can move data at an effective speed of 40 MB/sec on a Sun 3/50, an order of magnitude faster than Unix or MACH.

\s+2Berkeley UNIX Project\s0 .pp We received the Wisconsin implementation of TP4, CLNP, and ESIS, incorporated them into the Berkeley Kernel revising the interface to TP4 to allow for arbitrary length network and transport addresses in a single structure, and provided new and uniform means for communicating record boundaries, and ancillary data, such as user call data and user disconnect data. The code now works well enough to establish a connection directly over 802.2-3/CLNP/TP4 between two unlike machines (a microvax and a CCI machine). .pp We completed an implementation begun at Wisconsin of encapsulating CLNP packets in IP. The encapsulation is documented in RFC1070. This also has been tested and appears to be working to the same extent as the TP code. .pp The performance improvements for TCP reported last quarter, along with the revised networking delivered with the 4.3BSD Tahoe test release have been extracted from the rest of the system and are now available as a separate networking release. Unlike the Tahoe release that is available only to sites with an AT&T source license, the networking release is available without any license. This eased availability means that it can be used by many companies building embedded systems that cannot afford to pay UNIX licensing fees for their products. .pp We are continuing our participation in the IEEE P1003 standardization efforts for portable operating systems, with particular attention to networking. .pp We also are participating in the IETF OSI interoperability working group. .pp The virtual filesystem interface has been constructed and is now running on one of our test machines. An early prototype of the interface is being used by Rick Macklem at the University of Guelph as a platform to build a public domain implementation of NFS. We expect that a fully functional NFS will be available in our next release.