For example, these data structures (or a portion thereof) may be stored in on-chip memory, such as a SRAM, DRAM, SDRAM, DDRDRAM, or other memory local to the packet processing device 320 (see FIGS. 3A???3B), comprising part of the on-chip memory subsystem 330 (see FIGS. 3C???3D), or local to the host CPU 300 (see FIGS. 3E???3F).