From eaa72dc47488d599439cd0fd0f8c4f1bcb3906bb Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 29 Aug 2017 15:16:01 -0700 Subject: neigh: increase queue_len_bytes to match wmem_default Florian reported UDP xmit drops that could be root caused to the too small neigh limit. Current limit is 64 KB, meaning that even a single UDP socket would hit it, since its default sk_sndbuf comes from net.core.wmem_default (~212992 bytes on 64bit arches). Once ARP/ND resolution is in progress, we should allow a little more packets to be queued, at least for one producer. Once neigh arp_queue is filled, a rogue socket should hit its sk_sndbuf limit and either block in sendmsg() or return -EAGAIN. Signed-off-by: Eric Dumazet Reported-by: Florian Fainelli Signed-off-by: David S. Miller --- net/decnet/dn_neigh.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/decnet') diff --git a/net/decnet/dn_neigh.c b/net/decnet/dn_neigh.c index 21dedf6fd0f7..22bf0b95d6ed 100644 --- a/net/decnet/dn_neigh.c +++ b/net/decnet/dn_neigh.c @@ -94,7 +94,7 @@ struct neigh_table dn_neigh_table = { [NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ, [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, [NEIGH_VAR_GC_STALETIME] = 60 * HZ, - [NEIGH_VAR_QUEUE_LEN_BYTES] = 64*1024, + [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX, [NEIGH_VAR_PROXY_QLEN] = 0, [NEIGH_VAR_ANYCAST_DELAY] = 0, [NEIGH_VAR_PROXY_DELAY] = 0, -- cgit v1.2.3