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neigh: increase queue_len_bytes to match wmem_default

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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 <edumazet@google.com>
Reported-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2017-08-29 15:16:01 -07:00
committed by David S. Miller
parent 0dd5759dbb
commit eaa72dc474
7 changed files with 19 additions and 16 deletions
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7
Documentation/networking/ip-sysctl.txt
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@@ -109,7 +109,10 @@ neigh/default/unres_qlen_bytes - INTEGER
queued for each unresolved address by other network layers.
(added in linux 3.3)
Setting negative value is meaningless and will return error.
Default: 65536 Bytes(64KB)
Default: SK_WMEM_MAX, (same as net.core.wmem_default).
Exact value depends on architecture and kernel options,
but should be enough to allow queuing 256 packets
of medium size.
neigh/default/unres_qlen - INTEGER
The maximum number of packets which may be queued for each
@@ -119,7 +122,7 @@ neigh/default/unres_qlen - INTEGER
unexpected packet loss. The current default value is calculated
according to default value of unres_qlen_bytes and true size of
packet.
Default: 31
Default: 101
mtu_expires - INTEGER
Time, in seconds, that cached PMTU information is kept.