622 Adapters

Performance Report on ATM adapters, Part No. A5483A, A5513A, and A5515A 09/30/99 7

Throughput–intensive applications can see an increase of about 20% when the application is

bound to a specific CPU. This is done as follows:

Find out which CPU the adapter is interrupting by using the sar command. With enough traffic

on the adapter, the sar output should show interrupts on only one CPU. The application is

bound to this CPU by using the mpctl system call.

• Network design-related Guidelines

When using LAN Emulation, HP recommends that all of the ATM systems be put on a separate

subnet and use an MTU size of 9 Kbytes for the subnet. Subnets that include legacy systems

must use the MTU size used by legacy systems; for example, Ethernet uses maximum MTU size

of 1500 bytes.