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Date: Wed, 6 Feb 2008 22:39:50 +0100
From: Sven Wegener <sven.wegener@...aler.net>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] ipvs: Make the synchronization interval controllable
The default synchronization interval of 1000 milliseconds is too high for a
heavily loaded director. Collecting the connection information from one second
and then sending it out in a burst will overflow the socket buffer and lead to
synchronization information being dropped. Make the interval controllable by a
sysctl variable so that users can tune it.
Signed-off-by: Sven Wegener <sven.wegener@...aler.net>
---
Documentation/networking/ipvs-sysctl.txt | 9 +++++++++
net/ipv4/ipvs/ip_vs_ctl.c | 9 ++++++++-
net/ipv4/ipvs/ip_vs_sync.c | 6 ++++--
3 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/Documentation/networking/ipvs-sysctl.txt b/Documentation/networking/ipvs-sysctl.txt
index 4ccdbca..1389e2f 100644
--- a/Documentation/networking/ipvs-sysctl.txt
+++ b/Documentation/networking/ipvs-sysctl.txt
@@ -141,3 +141,12 @@ sync_threshold - INTEGER
synchronized, every time the number of its incoming packets
modulus 50 equals the threshold. The range of the threshold is
from 0 to 49.
+
+sync_interval - INTEGER
+ default 1000
+
+ The information from synchronization is buffered and sent out at
+ regular intervals by a kernel thread. The interval (in ms) is
+ controlled by this value. The default is too high for a heavily loaded
+ director. If you get a lot of "ip_vs_send_async error" messages from
+ your kernel, then you should lower this value.
diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/ipv4/ipvs/ip_vs_ctl.c
index 94c5767..2781505 100644
--- a/net/ipv4/ipvs/ip_vs_ctl.c
+++ b/net/ipv4/ipvs/ip_vs_ctl.c
@@ -81,7 +81,7 @@ int sysctl_ip_vs_expire_nodest_conn = 0;
int sysctl_ip_vs_expire_quiescent_template = 0;
int sysctl_ip_vs_sync_threshold[2] = { 3, 50 };
int sysctl_ip_vs_nat_icmp_send = 0;
-
+extern int sysctl_ip_vs_sync_interval;
#ifdef CONFIG_IP_VS_DEBUG
static int sysctl_ip_vs_debug_level = 0;
@@ -1582,6 +1582,13 @@ static struct ctl_table vs_vars[] = {
.proc_handler = &proc_do_sync_threshold,
},
{
+ .procname = "sync_interval",
+ .data = &sysctl_ip_vs_sync_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
.procname = "nat_icmp_send",
.data = &sysctl_ip_vs_nat_icmp_send,
.maxlen = sizeof(int),
diff --git a/net/ipv4/ipvs/ip_vs_sync.c b/net/ipv4/ipvs/ip_vs_sync.c
index 948378d..9b57ad3 100644
--- a/net/ipv4/ipvs/ip_vs_sync.c
+++ b/net/ipv4/ipvs/ip_vs_sync.c
@@ -143,6 +143,8 @@ char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
/* multicast addr */
static struct sockaddr_in mcast_addr;
+/* milliseconds between synchronization runs */
+int sysctl_ip_vs_sync_interval = 1000;
static inline void sb_queue_tail(struct ip_vs_sync_buff *sb)
{
@@ -701,7 +703,7 @@ static void sync_master_loop(void)
if (stop_master_sync)
break;
- msleep_interruptible(1000);
+ msleep_interruptible(sysctl_ip_vs_sync_interval);
}
/* clean up the sync_buff queue */
@@ -758,7 +760,7 @@ static void sync_backup_loop(void)
if (stop_backup_sync)
break;
- msleep_interruptible(1000);
+ msleep_interruptible(sysctl_ip_vs_sync_interval);
}
/* release the sending multicast socket */
--
1.5.4
--
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