Hi David
Large routers/servers spend lot of CPU time in route cache lookups. This is
because each item lookup uses two cache lines : the next pointer is at the
begining of item, but keys are far away from this pointer.
Furthermore, the u unions declared in struct rtable, rt6_info and dn_route are
imho quite ugly (forcing next pointer be at null offset)
This patch try to cleanup the layering and try to put the 'next' pointer near
the fields used at lookup time (in ip_route_input() for example)
I prepared the following five patches :
[PATCH 1/5] : Introduce union in struct dst_entry, to prepare patches 2,3,4
[PATCH 2/5] : Convert ipv4 route to use the new dst_entry 'next' pointer
[PATCH 3/5] : Convert ipv6 route to use the new dst_entry 'next' pointer
[PATCH 4/5] : Convert decnet route to use the new dst_entry 'next' pointer
[PATCH 5/5] : Reorder fields of struct dst_entry
Thank you
Eric Dumazet
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