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Message-ID: <20230815173031.168344-15-ja@ssi.bg>
Date: Tue, 15 Aug 2023 20:30:31 +0300
From: Julian Anastasov <ja@....bg>
To: Simon Horman <horms@...ge.net.au>
Cc: lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org,
netdev@...r.kernel.org, "Paul E . McKenney" <paulmck@...nel.org>,
rcu@...r.kernel.org, Dust Li <dust.li@...ux.alibaba.com>,
Jiejian Wu <jiejian@...ux.alibaba.com>,
Jiri Wiesner <jwiesner@...e.de>
Subject: [PATCH RFC net-next 14/14] ipvs: add conn_lfactor and svc_lfactor sysctl vars
Allow the default load factor for the connection and service tables
to be configured.
Signed-off-by: Julian Anastasov <ja@....bg>
---
Documentation/networking/ipvs-sysctl.rst | 31 ++++++++++
net/netfilter/ipvs/ip_vs_ctl.c | 72 ++++++++++++++++++++++++
2 files changed, 103 insertions(+)
diff --git a/Documentation/networking/ipvs-sysctl.rst b/Documentation/networking/ipvs-sysctl.rst
index 3fb5fa142eef..61fdc0ec4c39 100644
--- a/Documentation/networking/ipvs-sysctl.rst
+++ b/Documentation/networking/ipvs-sysctl.rst
@@ -29,6 +29,28 @@ backup_only - BOOLEAN
If set, disable the director function while the server is
in backup mode to avoid packet loops for DR/TUN methods.
+conn_lfactor - INTEGER
+ 4 - default
+ Valid range: -8 (smaller table) .. 8 (larger table)
+
+ Controls the sizing of the connection hash table based on the
+ load factor (number of connections per table buckets).
+ As result, the table grows if load increases and shrinks when
+ load decreases in the range of 2^8 - 2^conn_tab_bits (module
+ parameter).
+ The value is a shift count where positive values select
+ buckets = (connection hash nodes << value) while negative
+ values select buckets = (connection hash nodes >> value). The
+ positive values reduce the collisions and reduce the time for
+ lookups but increase the table size. Negative values will
+ tolerate load above 100% when using smaller table is
+ preferred. If using NAT connections consider increasing the
+ value with one because they add two nodes in the hash table.
+
+ Example:
+ 4: grow if load goes above 6% (buckets = nodes * 16)
+ -2: grow if load goes above 400% (buckets = nodes / 4)
+
conn_reuse_mode - INTEGER
1 - default
@@ -219,6 +241,15 @@ secure_tcp - INTEGER
The value definition is the same as that of drop_entry and
drop_packet.
+svc_lfactor - INTEGER
+ 3 - default
+ Valid range: -8 (smaller table) .. 8 (larger table)
+
+ Controls the sizing of the service hash table based on the
+ load factor (number of services per table buckets). The table
+ will grow and shrink in the range of 2^4 - 2^20.
+ See conn_lfactor for explanation.
+
sync_threshold - vector of 2 INTEGERs: sync_threshold, sync_period
default 3 50
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 5b2a5e3bf309..ca21f4c64a45 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2427,6 +2427,60 @@ static int ipvs_proc_run_estimation(struct ctl_table *table, int write,
return ret;
}
+static int ipvs_proc_conn_lfactor(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct netns_ipvs *ipvs = table->extra2;
+ int *valp = table->data;
+ int val = *valp;
+ int ret;
+
+ struct ctl_table tmp_table = {
+ .data = &val,
+ .maxlen = sizeof(int),
+ };
+
+ ret = proc_dointvec(&tmp_table, write, buffer, lenp, ppos);
+ if (write && ret >= 0) {
+ if (val < -8 || val > 8) {
+ ret = -EINVAL;
+ } else {
+ *valp = val;
+ if (rcu_dereference_protected(ipvs->conn_tab, 1))
+ mod_delayed_work(system_unbound_wq,
+ &ipvs->conn_resize_work, 0);
+ }
+ }
+ return ret;
+}
+
+static int ipvs_proc_svc_lfactor(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct netns_ipvs *ipvs = table->extra2;
+ int *valp = table->data;
+ int val = *valp;
+ int ret;
+
+ struct ctl_table tmp_table = {
+ .data = &val,
+ .maxlen = sizeof(int),
+ };
+
+ ret = proc_dointvec(&tmp_table, write, buffer, lenp, ppos);
+ if (write && ret >= 0) {
+ if (val < -8 || val > 8) {
+ ret = -EINVAL;
+ } else {
+ *valp = val;
+ if (rcu_dereference_protected(ipvs->svc_table, 1))
+ mod_delayed_work(system_unbound_wq,
+ &ipvs->svc_resize_work, 0);
+ }
+ }
+ return ret;
+}
+
/*
* IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
* Do not change order or insert new entries without
@@ -2615,6 +2669,18 @@ static struct ctl_table vs_vars[] = {
.mode = 0644,
.proc_handler = ipvs_proc_est_nice,
},
+ {
+ .procname = "conn_lfactor",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = ipvs_proc_conn_lfactor,
+ },
+ {
+ .procname = "svc_lfactor",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = ipvs_proc_svc_lfactor,
+ },
#ifdef CONFIG_IP_VS_DEBUG
{
.procname = "debug_level",
@@ -4850,6 +4916,12 @@ static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
tbl[idx].extra2 = ipvs;
tbl[idx++].data = &ipvs->sysctl_est_nice;
+ tbl[idx].extra2 = ipvs;
+ tbl[idx++].data = &ipvs->sysctl_conn_lfactor;
+
+ tbl[idx].extra2 = ipvs;
+ tbl[idx++].data = &ipvs->sysctl_svc_lfactor;
+
#ifdef CONFIG_IP_VS_DEBUG
/* Global sysctls must be ro in non-init netns */
if (!net_eq(net, &init_net))
--
2.41.0
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