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ipv4: Dirty less cache lines in route caching paths.

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Don't bother incrementing dst->__use and setting dst->lastuse,
they are completely pointless and just slow things down.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-17 14:09:39 -07:00
parent ba3f7f04ef
commit 93ac53410a
1 changed files with 3 additions and 3 deletions
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6
net/ipv4/route.c
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@ -1443,7 +1443,7 @@ static int __mkroute_input(struct sk_buff *skb,
if (!(flags & RTCF_DIRECTSRC) && !itag) {
rth = FIB_RES_NH(*res).nh_rth_input;
if (rt_cache_valid(rth)) {
dst_use(&rth->dst, jiffies);
dst_hold(&rth->dst);
goto out;
}
do_cache = true;
@ -1619,7 +1619,7 @@ out: return err;
if (!(flags & RTCF_DIRECTSRC) && !itag) {
rth = FIB_RES_NH(res).nh_rth_input;
if (rt_cache_valid(rth)) {
dst_use(&rth->dst, jiffies);
dst_hold(&rth->dst);
goto set_and_out;
}
do_cache = true;
@ -1789,7 +1789,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
if (!fnhe) {
rth = FIB_RES_NH(*res).nh_rth_output;
if (rt_cache_valid(rth)) {
dst_use(&rth->dst, jiffies);
dst_hold(&rth->dst);
return rth;
}
}