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| author | Eric Dumazet <edumazet@google.com> | 2017-08-29 15:16:01 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-29 16:10:50 -0700 |
| commit | eaa72dc47488d599439cd0fd0f8c4f1bcb3906bb (patch) | |
| tree | d35829277414b465b199dcada5af2e70f6183533 /Documentation/networking | |
| parent | 0dd5759dbb1c9a862e7d90c09d6cf398c45f1100 (diff) | |
| download | linux-eaa72dc47488d599439cd0fd0f8c4f1bcb3906bb.tar.bz2 | |
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 <edumazet@google.com>
Reported-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index 6b0bc0f71534..b3345d0fe0a6 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -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. |