summaryrefslogtreecommitdiff
path: root/net/ipv4/sysctl_net_ipv4.c
diff options
context:
space:
mode:
authorFan Du <fan.du@intel.com>2015-03-06 06:18:23 +0300
committerDavid S. Miller <davem@davemloft.net>2015-03-06 22:57:41 +0300
commit6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 (patch)
treedcfd707a04fd8295b1384cc18fc60addf22ae23a /net/ipv4/sysctl_net_ipv4.c
parentdcd8fb8533ceb493146ce030d15f7965b82d0c27 (diff)
downloadlinux-6b58e0a5f32dedb609438bb9c9c82aa6e23381f2.tar.xz
ipv4: Use binary search to choose tcp PMTU probe_size
Current probe_size is chosen by doubling mss_cache, the probing process will end shortly with a sub-optimal mss size, and the link mtu will not be taken full advantage of, in return, this will make user to tweak tcp_base_mss with care. Use binary search to choose probe_size in a fine granularity manner, an optimal mss will be found to boost performance as its maxmium. In addition, introduce a sysctl_tcp_probe_threshold to control when probing will stop in respect to the width of search range. Test env: Docker instance with vxlan encapuslation(82599EB) iperf -c 10.0.0.24 -t 60 before this patch: 1.26 Gbits/sec After this patch: increase 26% 1.59 Gbits/sec Signed-off-by: Fan Du <fan.du@intel.com> Acked-by: John Heffner <johnwheffner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/sysctl_net_ipv4.c')
-rw-r--r--net/ipv4/sysctl_net_ipv4.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index d151539da8e6..d3c09c12ee81 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -883,6 +883,13 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
+ {
+ .procname = "tcp_probe_threshold",
+ .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
{ }
};