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authorFlorian Westphal <fw@strlen.de>2016-06-22 13:26:10 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2016-06-24 11:03:28 +0200
commit3183ab8997a477c8d9ad175a1cef70dff77c6dbc (patch)
tree05fc36b7e2fa3b896cc412cdd8f0f1ac796965a3 /Documentation/networking
parent8eee54be73f4b938dbf48e95c0dbecb5f19b08ee (diff)
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netfilter: conntrack: allow increasing bucket size via sysctl too
No need to restrict this to module parameter. We export a copy of the real hash size -- when user alters the value we allocate the new table, copy entries etc before we update the real size to the requested one. This is also needed because the real size is used by concurrent readers and cannot be changed without synchronizing the conntrack generation seqcnt. We only allow changing this value from the initial net namespace. Tested using http-client-benchmark vs. httpterm with concurrent while true;do echo $RANDOM > /proc/sys/net/netfilter/nf_conntrack_buckets done Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/nf_conntrack-sysctl.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/networking/nf_conntrack-sysctl.txt b/Documentation/networking/nf_conntrack-sysctl.txt
index f55599c62c9d..4fb51d32fccc 100644
--- a/Documentation/networking/nf_conntrack-sysctl.txt
+++ b/Documentation/networking/nf_conntrack-sysctl.txt
@@ -7,12 +7,13 @@ nf_conntrack_acct - BOOLEAN
Enable connection tracking flow accounting. 64-bit byte and packet
counters per flow are added.
-nf_conntrack_buckets - INTEGER (read-only)
+nf_conntrack_buckets - INTEGER
Size of hash table. If not specified as parameter during module
loading, the default size is calculated by dividing total memory
by 16384 to determine the number of buckets but the hash table will
never have fewer than 32 and limited to 16384 buckets. For systems
with more than 4GB of memory it will be 65536 buckets.
+ This sysctl is only writeable in the initial net namespace.
nf_conntrack_checksum - BOOLEAN
0 - disabled