A high performance get-put interface for ATM communications
CASCON '97 Proceedings of the 1997 conference of the Centre for Advanced Studies on Collaborative research
Performance model of the Argonne Voyager multimedia server
ASAP '97 Proceedings of the IEEE International Conference on Application-Specific Systems, Architectures and Processors
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Message transfer unit (MTU) reassembly schemes in modern operating systems cause I/O performance degradation when MTU sizes are larger than the architecture's page size. This can happen with emerging network technologies, such as Asynchronous Transfer Mode (ATM), where MTUs can be 64 KB or greater. Traditional solutions either reassemble using memory copy or preallocate contiguous memory; these, however, lack speed or consume excess resources, respectively. This paper presents an alternate scheme called Virtual Memory MTU Reassembly (VMMR) which reassembles non-contiguous pages through virtual memory remapping. VMMR allows hardware/software interfaces to efficiently DMA large MTUs in hardware pages and remap them to a contiguous address space. Studies done on a PowerPC 601 show that this method can outperform memcopy by one to two orders of magnitude (the maximum VMMR bandwidth is 14.7 Gbits/sec). High-performance multimedia applications, such as video on demand and video conferencing, can greatly benefit from such a performance boost.