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authorMarcelo Ricardo Leitner <mleitner@redhat.com>2015-02-23 15:02:34 -0300
committerSimon Horman <horms@verge.net.au>2015-02-25 13:46:35 +0900
commitd752c364571743d696c2a54a449ce77550c35ac5 (patch)
tree160b607482c080c720f27626fa7a7130307cbbf3 /include/net/ip_vs.h
parent7f73b9f1ca7334eec0ff9a40e37ece92dd3e420f (diff)
downloadlinux-d752c364571743d696c2a54a449ce77550c35ac5.tar.bz2
ipvs: allow rescheduling of new connections when port reuse is detected
Currently, when TCP/SCTP port reusing happens, IPVS will find the old entry and use it for the new one, behaving like a forced persistence. But if you consider a cluster with a heavy load of small connections, such reuse will happen often and may lead to a not optimal load balancing and might prevent a new node from getting a fair load. This patch introduces a new sysctl, conn_reuse_mode, that allows controlling how to proceed when port reuse is detected. The default value will allow rescheduling of new connections only if the old entry was in TIME_WAIT state for TCP or CLOSED for SCTP. Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com> Signed-off-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'include/net/ip_vs.h')
-rw-r--r--include/net/ip_vs.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index a627fe690c19..20fd23398537 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -941,6 +941,7 @@ struct netns_ipvs {
int sysctl_nat_icmp_send;
int sysctl_pmtu_disc;
int sysctl_backup_only;
+ int sysctl_conn_reuse_mode;
/* ip_vs_lblc */
int sysctl_lblc_expiration;
@@ -1059,6 +1060,11 @@ static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
ipvs->sysctl_backup_only;
}
+static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
+{
+ return ipvs->sysctl_conn_reuse_mode;
+}
+
#else
static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
@@ -1126,6 +1132,11 @@ static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
return 0;
}
+static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
+{
+ return 1;
+}
+
#endif
/* IPVS core functions