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authorJosh Hunt <johunt@akamai.com>2019-08-07 19:52:29 -0400
committerDavid S. Miller <davem@davemloft.net>2019-08-09 13:03:30 -0700
commitc04b79b6cfd714144f6a2cf359603d82ee631e62 (patch)
tree3ef5597a3400666cfb0362c0ab1abbd666b87da3 /include/net/netns
parent3a5e523479c49b082b8ac291a1a9fbd035c06df5 (diff)
tcp: add new tcp_mtu_probe_floor sysctl
The current implementation of TCP MTU probing can considerably underestimate the MTU on lossy connections allowing the MSS to get down to 48. We have found that in almost all of these cases on our networks these paths can handle much larger MTUs meaning the connections are being artificially limited. Even though TCP MTU probing can raise the MSS back up we have seen this not to be the case causing connections to be "stuck" with an MSS of 48 when heavy loss is present. Prior to pushing out this change we could not keep TCP MTU probing enabled b/c of the above reasons. Now with a reasonble floor set we've had it enabled for the past 6 months. The new sysctl will still default to TCP_MIN_SND_MSS (48), but gives administrators the ability to control the floor of MSS probing. Signed-off-by: Josh Hunt <johunt@akamai.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/netns')
-rw-r--r--include/net/netns/ipv4.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index bc24a8ec1ce5..c0c0791b1912 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -116,6 +116,7 @@ struct netns_ipv4 {
int sysctl_tcp_l3mdev_accept;
#endif
int sysctl_tcp_mtu_probing;
+ int sysctl_tcp_mtu_probe_floor;
int sysctl_tcp_base_mss;
int sysctl_tcp_min_snd_mss;
int sysctl_tcp_probe_threshold;