Performance Report for J2468A, J2469A, J2499A, J3573A, and J2806CA ATM/155 and ATM/622 Adapters

Performance Report on ATM adapters 4
Multiple Adapter Configuration Test Results
For systems with two HSC IO subsystems, the maximum throughput in outbound, inbound, or
two-way direction is limited to 600 Mbps due to how the ATM adapter uses the HSC I/O Bus. For
systems with four HSC IO subsystems (for example, the K580) the maximum throughput is
limited to 820 Mbps in outbound, inbound, or two-way data flow.
For a Classical IP interface with MTU size of 9180 bytes, the throughput increases linearly with
the number of adapters, until the 600 Mbps or 820 Mbps limits are reached. For example, see
Figure 2 below for a K580 system with four HSC IO subsystems.
Figure 2: TCP Throughput and Number of 622 Adapters on K580 (Four CPUs, Classical IP)
Figure 3: Platform Comparison: D380 and K580 (two CPUs, three 155 Adapters, Classical IP)
For lower-end systems such as the D380, the maximum throughput can become CPU bound.
See Figure 3 above. The D380 bidirectional throughput is lower than the K580 for the same
number of CPUs and adapters because of the lower SpecInt95 figures for the D380 CPU.
Throughput Scalability K580-622 (4 CPUs)
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Number of Adapters
Throughput Mbps
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Full Duplex
Maximum TCP Throughput: Platform Comparison
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D380 K580
Throughput Mbps
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Full Duplex