| 1. |
- 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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| 2. |
- Ahlgren, Bengt, et al.
(författare)
-
Increasing communication performance with a minimal-copy data path supporting ILP and ALF
- 1996
-
Ingår i: Journal of High Speed Networks. - 0926-6801 .- 1875-8940. ; 5:2, s. 203-214
-
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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| 3. |
- Ahlgren, Bengt, et al.
(författare)
-
The performance of a no-copy API for communication
- 1995. - 1
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Konferensbidrag (refereegranskat)abstract
- We present a so-called no-copy Application Programming Interface (API) for communication. The interface avoids copying when data is transferred between the application and operating system kernel address spaces. The API is an extension to the socket interface for SunOS, and has been implemented on Sun SPARCstations equipped with Fore Systems ATM adapters. Throughput for the no-copy API is 85 Mbit/s for 8K UDP messages, to be compared to 57 Mbit/s for the regular API on the SPARCstation 2. Processing times through the TCP and UDP stacks are reduced by up to 30% for the SPARCstation 2 and by more than 50% for the SPARCstation 10.
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| 4. |
- Moldeklev, Kjersti, et al.
(författare)
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How a large ATM MTU causes deadlocks in TCP data transfers
- 1995
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Ingår i: IEEE-ACM transactions on networking. - : Institute of Electrical and Electronics Engineers (IEEE). - 1063-6692. ; 3:4, s. 409-422
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Tidskriftsartikel (refereegranskat)abstract
- The implementation of protocols, such as TCP/IP, and their integration into the operating system environment is crucial for protocol performance, Putting TCP on high-speed networks, e.g., ATM, with large maximum transmission units causes the TCP maximum s
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