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- Ahlgren, Bengt, et al.
(författare)
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A Host Interface to the DTM Network
- 1992. - 1
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- DTM, dynamic synchronous transfer mode, is a new time division multiplexing technique for fiber networks currently being developed and implemented at the Royal Institute of Technology in Stockholm, Sweden. This paper describes the hardware and software aspects of the design of an SBus host interface to the DTM network for a Sun SPARCstation. The interface is based on a dual port memory residing on the interface card and accesible over the SBus from the host CPU. The host operating system allocates message buffers directly in this memory. The interface has hardware support for segmenting and reassembling packets to and from the data units of the DTM. The software part of the interface manages the shared memory and the virtual circuits provided by the DTM network.
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| 5. |
- Ahlgren, Bengt, et al.
(författare)
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Increasing communication performance with a minimal-copy data path supporting ILP and ALF
- 1996. - 1
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Ingår i: Journal of High Speed Networks. ; 5:2, s. 203-214
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Tidskriftsartikel (refereegranskat)abstract
- Many current implementations of communication subsystems on workstation class computers transfer communication data to and from primary memory several times. This is due to software copying between user and operating system address spaces, presentation layer data conversion and other data manipulation functions. The consequence is that memory bandwidth is one of the major performance bottlenecks limiting high speed communication on these systems. We propose a communication subsystem architecture with a minimal-copy data path to widen this bottleneck. The architecture is tailored for protocol implementations using Integrated Layer Processing (ILP) and Application Layer Framing (ALF). We choose to implement these protocols in the address space of the application program. We present a new application program interface (API) between the protocols and the communication service in the operating system kernel. The API does not copy data, but instead passes pointers to page size data buffers. We analyze and discuss ILP loop and cache memory requirements on these buffers. Initial experiments show that the API can increase the communication performance with 50% compared to a standard BSD Unix socket interface.
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| 6. |
- Ahlgren, Bengt, et al.
(författare)
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Increasing communication performance with a minimal-copy data path supporting ILP and ALF
- 1996
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Ingår i: Journal of High Speed Networks. - 0926-6801 .- 1875-8940. ; 5:2, s. 203-214
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Tidskriftsartikel (refereegranskat)abstract
- Many current implementations of communication subsystems on workstation class computers transfer communication data to and from primary memory several times. This is due to software copying between user and operating system address spaces, presentation la
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| 7. |
- Ahlgren, Bengt, et al.
(författare)
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Integrated layer processing can be hazardous to your performance
- 1997. - 1
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Konferensbidrag (refereegranskat)abstract
- Integrated Layer Processing (ILP) has been presented as an implementation technique to improve communication protocol performance by reducing the number of memory references. Previous research has however not pointed out that in some circumstances ILP can significantly increase the number of memory references, resulting in lower communication throughput. We explore the performance effects of applying ILP to data manipulation functions with varying characteristics. The functions are generated from a set of parameters including input and output block size, state size and number of instructions. We present experimental data for varying function state sizes, number of integrated functions and instruction counts. The results clearly show that the aggregated state of the functions must fit in registers for ILP to be competitive.
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| 8. |
- Ahlgren, Bengt, et al.
(författare)
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The applicability of integrated layer processing
- 1998. - 4
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Ingår i: IEEE Journal on Selected Areas in Communications. ; 16:3, s. 317-331
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Tidskriftsartikel (refereegranskat)abstract
- In this paper we review previous work on the applicability and performance of Integrated Layer Processing (ILP). ILP has been shown to clearly improve computer communication performance when integrating simple data manipulation functions, but the situation has been less clear for more complex functions and complete systems. We discuss complications when applying ILP to protocol stacks, the requirements of ILP on the communication subsystem, caching aspects, the importance of the processor registers, and a model for predicting the performance of data manipulation functions. We conclude that the main drawback of ILP is its limited aplicability to complex data manipulation functions. The performance to expect from an ILP implementation also depends heavily on the protocol architecture and the host system architecture.
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| 9. |
- Ahlgren, Bengt, et al.
(författare)
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The applicability of integrated layer processing
- 1998
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Ingår i: IEEE Journal on Selected Areas in Communications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8716 .- 1558-0008. ; 16:3, s. 317-331
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we review previous work on the applicability and performance of integrated layer processing (ILP). ILP has been shown to clearly improve computer communication performance when integrating simple data manipulation functions, but the situati
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