considering cache line hits and misses. Put the lock and hash list
glue into the first cache line, put inp_refcount inp_flags inp_socket
into the second cache line.
o On allocation zero out entire structure except the lock and list entries,
including inp_route inp_lle inp_gencnt. When inp_route and inp_lle were
introduced, they were added below inp_zero_size, resulting on not being
cleared after free/alloc. This definitely was a source of bugs with route
caching. Could be that r315956 has just fixed one of them.
The inp_gencnt is reinitialized on every alloc, so it is safe to clear it.
This has been proved to improve TCP performance at Netflix.
Obtained from: rrs
Differential Revision: D10686
7845c5b75c