We plan to implement a new node in VPP. I have the following 2 small questions
(1) 2 + 2 principle
For each vpp node, first it prefetch the next 2 packets (see the following
codes) and then process the 2 current packets. Do we must to follow this
programming style? Can we do 4+4 or 6+6 ?
{
vlib_prefetch_buffer_header(...);
vlib_prefetch_buffer_header(...);
CLIB_PREFETCH(...);
CLIB_PREFETCH(...);
}
(2) Code size for one node
I know that one node's instructions should fit into ICache for the performance
issue. But the current X86 has 32K ICache, do we need to consider the code size
of one node ?
Thx
Ming
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