| Message ID | 1369653376-4731-5-git-send-email-timo.teras@iki.fi |
|---|---|
| State | Deferred, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 561a378..a4082be 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -947,6 +947,10 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) if (mtu < ip_rt_min_pmtu) mtu = ip_rt_min_pmtu; + if (rt->rt_pmtu == mtu && + time_before(jiffies, dst->expires - ip_rt_mtu_expires / 2)) + return; + rcu_read_lock(); if (fib_lookup(dev_net(dst->dev), fl4, &res) == 0) { struct fib_nh *nh = &FIB_RES_NH(res);
The tunnel devices call update_pmtu for each packet sent, this causes contention on the fnhe_lock. Ignore the pmtu update if pmtu is not actually changed, and there is still plenty of time before the entry expires. Signed-off-by: Timo Teräs <timo.teras@iki.fi> --- net/ipv4/route.c | 4 ++++ 1 file changed, 4 insertions(+)