Testing and Modeling Ethernet Switches and Networks for Use in ATLAS High - level Triggers
نویسندگان
چکیده
The ATLAS second level trigger will use a multi-layered LAN network to transfer 5 Gbyte/s detector data from ~1500 buffers to a few hundred processors. A model of the network has been constructed to evaluate its performance. A key component of the network model is a model of an individual switch, reproducing the behavior measured in real devices. A small number of measurable parameters are used to model a variety of commercial Ethernet switches. Using parameters measured on real devices, the impact on the overall network performance i s modeled. In the Atlas context, both 100 Mbit and Gigabit Ethernet links are required. A system is described which is capable of characterizing the behavior of commercial switches with the required number of nodes under traffic conditions resembling those to be encountered in the Atlas experiment. Fast Ethernet traffic is provided by a high density, custom built tester based on FPGAs, programmed in Handel-C and VHDL, while the Gigabit Ethernet traffic is generated using Alteon NICs with custom firmware. The system is currently being deployed with 32 100Mbit ports and 16 Gigabit ports, and will be expanded to ~256 nodes of 100 Mbit and ~50 GBE nodes.
منابع مشابه
Ethernet for the ATLAS second level trigger?
The use of Ethernet in implementing the ATLAS second level at the CERN Large Hadron Collider (LHC) is considered. Tests carried out on a large network testbed using 100 Mbps DS links and switches are used as a reference point. The evolution and present status of the IEEE 802.3 Ethernet standard is reviewed and technical problems in exploiting the technology at the LHC are explored.
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