Corey Kosak, David Eckhardt, Todd Mummert, Peter Steenkiste, and Allan Fisher. Buffer Management and Flow Control in the Credit Net ATM Host Interface. LAN20, IEEE, Minneapolis, October, 1995, pp. 370-378.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....specifically for continuous media applications. It supports functions for full end to end multimedia communication in addition to protocol processing, and is capable of moving data directly between I O devices and the network via device to device communication. The Credit Net ATM network interface [101] provides appropriate buffer management and flow scheduling 39 support suitable for connections engaged in guaranteed QoS communication. We have examined the impact of adapter characteristics on the ability to support realtime communication effectively [77] and have explored QoS support on ....

....called END, providing link bandwidth management [78] Using END, we can explore additional issues involved when interfacing to adapters with support for QoS guarantees. In addition to the nature of QoS guarantees, various alternatives for adapter support for buffer management can be explored [101, 130]. While we have focused on per channel QoS guarantees, this architecture can be easily extended to allow aggregation of multiple connections on the QoS pipe provided by a channel. This would then provide effective support for adaptive applications which are built 75 with a certain degree of ....

C. Kosak, D. Eckhardt, T. Mummert, P. Steenkiste, and A. Fisher, "Buffer management and flow control in the Credit Net ATM host interface," in Proc. Conference on Local Computer Networks, pp. 370--378, October 1995.

....adjustable, the operation of the LLE link must be disabled to change it; the LDS allows delay adjustment during operation. The LLE is made from expensive, custom hardware, and is special purpose its ATM interface cannot be used as a conventional host adapter. Carnegie Mellon s virtual port card [2] implements delay and switch functions (such as flow control protocols) in commodity PC hardware. However, the virtual port card requires two host adapters (the LDS only requires one) and the virtual port card does not support full OC 3; it runs at a significantly reduced rate. Furthermore, the ....

Kosak, C., Eckhardt, D., Mummert, T., Steenkiste, P., and Fisher, A., Buffer Management and Flow Control in the Credit Net ATM Host Interface, Proceedings of IEEE INFOCOM '97, Kobe, Japan.

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Corey Kosak, David Eckhardt, Todd Mummert, Peter Steenkiste, and Allan Fisher. Buffer Management and Flow Control in the Credit Net ATM Host Interface. LAN20, IEEE, Minneapolis, October, 1995, pp. 370-378.

....many groups have implemented APIs with share and move semantics [8, 9, 10, 11] By changing the semantics of the API it is sometimes possible to achieve single copy communication without the need for outboard buffering. We are evaluating these techniques in the context of the Credit Net project [28, 13, 29]. 8 Conclusion We described a network adapter architecture and implementation that provides outboard buffering and checksumming in support of single copy communication for applications using BSD sockets and IP protocols. We also described how a single copy path can be added to a typical Unix ....

Corey Kosak, David Eckhardt, Todd Mummert, Peter Steenkiste, and Allan Fisher. Buffer management and flow control in the credit net ATM host interface. In Proceedings of the 20th Conference on Local Computer Networks, pages 370--378, Minneapolis, October 1995. IEEE.

....Labs have jointly designed an ATM network adapter for the PCI I O bus in the context of the Credit Net project. This project has brought CMU, Intel, Harvard University and Bell Northern Research together to build a 622 Mbps ATM network that uses credit based flow control for traffic management [17]. Adapters for standard 155 Mbps and 622 Mbps ATM SONET links have been built by Intel [17] Although the adapters are intended to be used as regular network interfaces, they support the HARP architecture. In this section we first briefly describe the Credit Net adapter, and then show how it ....

....the Credit Net project. This project has brought CMU, Intel, Harvard University and Bell Northern Research together to build a 622 Mbps ATM network that uses credit based flow control for traffic management [17] Adapters for standard 155 Mbps and 622 Mbps ATM SONET links have been built by Intel [17]. Although the adapters are intended to be used as regular network interfaces, they support the HARP architecture. In this section we first briefly describe the Credit Net adapter, and then show how it supports the three features essential to HARP. 5.1 Adapter architecture Figure 3(a) shows a ....

Corey Kosak, David Eckhardt, Todd Mummert, Peter Steenkiste, and Allan Fisher. Buffer management and flow control in the credit net ATM host interface. In Proceedings of the 20th Conference on Local Computer Networks, pages 370--378, Minneapolis, October 1995. IEEE.

....the raw commands to the HIPPI driver to send and receive packets from the link layer. Our buffer management system was simple, maintaining FIFOs of fixed sized send and receive buffers. 4. 2 Credit Net The Credit Net platform at CMU consists of PC s with ATM network cards connected by ATM switches[15]. The host to switch connections are 155 Mbps fiber optic cable. Genie, an I O system being developed by Jose Brustoloni, a CMU graduate student, provided our interface to the ATM device driver[14] This system allows for blocking and non blocking use. Although many different semantics are ....

Corey Kosak, David Eckhardt, Todd Mummert, Peter Steenkiste and Allan Fisher. "Buffer Management and Flow Control in the Credit Net ATM Host Interface", Proceedings of the 20th Conference on Local Computer Networks, October 1995, pp. 370-378.

....This section reports end to end latencies and CPU utilization for datagram communication measured using the various buffering semantics and early demultiplexed or pooled input buffering. We ran our experiments on computers of the types shown in Table 5, connected by the Credit Net ATM network [14] at OC 3 (155 Mbps) rates. Unless otherwise noted all figures and tables in this and the next sections refer to the Micron P166 PCs. Results from the other platforms were similar and can be found in [3] The Credit Net network adapter transfers data between main memory and the physical medium by ....

C. Kosak, D. Eckhardt, T. Mummert, P. Steenkiste and A. Fischer. "Buffer Management and Flow Control in the Credit Net ATM Host Interface", in Proc. 20th Conf. Local Computer Networks, IEEE, Oct. 1995, pp. 370-378.

....This section reports end to end latencies and I O processing times for datagram communication measured using the various buffering semantics and early demultiplexed or pooled input buffering. We ran our experiments on computers of the types shown in Table 5, connected by the Credit Net ATM network [13] at OC 3 (155 Mbps) rates. All figures in this section refer to Micron P166 PCs. Results for the other platforms were similar and are summarized in Section 8.1. The Credit Net network adapter transfers data between main memory and the physical medium by burstmode DMA over the PCI I O bus. We used ....

C. Kosak, D. Eckhardt, T. Mummert, P. Steenkiste and A. Fischer. "Buffer Management and Flow Control in the Credit Net ATM Host Interface", in Proc. 20th Conf. Local Computer Networks, IEEE, Oct. 1995, pp. 370-378.

....ATM local area network. Credit Net LAN incorporates OC 3 and OC 12 SONET switch and host interfaces, though this study uses only the OC 3 hardware. The Credit Net LAN switch hardware[10] provides native support for per VC buffering and feedback of absolute buffer credits. The Credit Net LAN adapter[7] provides a variety of mechanisms for implementing congestion control algorithms, including a microengine and an optional imbedded microprocessor. These facilities allow implementation of a variety of endpoint behaviors with high performance. Furthermore, we can use the adapter in a virtual port ....

Corey Kosak, David Eckhardt, Todd Mummert, Peter Steenkiste, and Allan Fisher. Buffer management and flow control in the credit net ATM host interface. In Proceedings of the 20th Conference on Local Computer Networks, pages 370--378, Minneapolis, October 1995. IEEE.

....separate header and data trailer buffer segment lists, shared among multiple reception ports, as depicted in Figure 2. The initial portion of a packet is stored in a segment allocated from the header list, while the remainder of the packet is stored in segments allocated from the data trailer list [12]. If segments in the header list have length equal to that of packet headers, this scheme normalizes the preferred buffer alignment to page boundaries. Head Head Header list Data Trailer list Figure 2: Separate header and data trailer buffer lists Solaris zero copy TCP [5] uses this technique ....

....the page size (4 KB) Reported latencies are equal to the roundtrip times divided by two. In this section, all graphs have legends listed in the same order as the corresponding curves. The CreditNet network adapter supports pooled and early demultiplexed input buffering and header data splitting [12]. It has only limited support for data trailer splitting (it automatically removes ATM AAL5 trailers (depadding) only if the PDU length modulo 48 is not greater than 40) and does not support buffer snap off or checksumming. Figure 6 shows the single packet latency for early demultiplexed ....

C. Kosak, D. Eckhardt, T. Mummert, P. Steenkiste and Allan Fischer. "Buffer Management and Flow Control in the Credit Net ATM Host Interface", in Proc. 20th Conf. Local Computer Networks, IEEE, Oct. 1995, pp. 370-378.

....This section reports end to end latencies and CPU utilization for datagram communication measured using the various buffering semantics and early demultiplexed or pooled input buffering. We ran our experiments on computers of the types shown in Table 5, connected by the Credit Net ATM network [14] at OC 3 (155 Mbps) rates. Unless otherwise noted all figures and tables in this and the next sections refer to the Micron P166 PCs. Results for the other platforms were similar and can be found in [3] The Credit Net network adapter transfers data between main memory and the physical medium by ....

C. Kosak, D. Eckhardt, T. Mummert, P. Steenkiste and A. Fischer. "Buffer Management and Flow Control in the Credit Net ATM Host Interface", in Proc. 20th Conf. Local Computer Networks, IEEE, Oct. 1995, pp. 370-378.

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