Re: [PATCH] Add prefetches in net/ipv4/route.c

["David S. Miller" <davem@xxxxxxxxxxxxx>]

From: Eric Dumazet <dada1@xxxxxxxxxxxxx>
Date: Thu, 28 Jul 2005 23:24:33 +0200

> On a dual opteron machine, this thing from ip_route_input() is very expensive 
> :
> 
>   RT_CACHE_STAT_INC(in_hlist_search);

That's amazing since it's per-cpu.  I don't have any suggestions
besides your idea to increment it once using an accumulation local
variable.