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| author | Florian Westphal <fw@strlen.de> | 2016-06-22 13:26:10 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-06-24 11:03:28 +0200 |
| commit | 3183ab8997a477c8d9ad175a1cef70dff77c6dbc (patch) | |
| tree | 05fc36b7e2fa3b896cc412cdd8f0f1ac796965a3 /Documentation/networking | |
| parent | 8eee54be73f4b938dbf48e95c0dbecb5f19b08ee (diff) | |
| download | linux-3183ab8997a477c8d9ad175a1cef70dff77c6dbc.tar.gz linux-3183ab8997a477c8d9ad175a1cef70dff77c6dbc.tar.bz2 linux-3183ab8997a477c8d9ad175a1cef70dff77c6dbc.zip | |
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.txt | 3 |
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 |