diff options
| author | Dust Li <dust.li@linux.alibaba.com> | 2021-08-20 07:37:52 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-10-07 19:52:58 +0200 |
| commit | 2232642ec3fb4aad6ae4da1e109f55a0e7f2d204 (patch) | |
| tree | 23d4ce8562232628c0f5b385d1c20515890d9f3d /Documentation/networking/ipvs-sysctl.rst | |
| parent | ethernet: ti: cpts: Use devm_kcalloc() instead of devm_kzalloc() (diff) | |
| download | linux-2232642ec3fb4aad6ae4da1e109f55a0e7f2d204.tar.xz linux-2232642ec3fb4aad6ae4da1e109f55a0e7f2d204.zip | |
ipvs: add sysctl_run_estimation to support disable estimation
estimation_timer will iterate the est_list to do estimation
for each ipvs stats. When there are lots of services, the
list can be very large.
We found that estimation_timer() run for more then 200ms on a
machine with 104 CPU and 50K services.
yunhong-cgl jiang report the same phenomenon before:
https://www.spinics.net/lists/lvs-devel/msg05426.html
In some cases(for example a large K8S cluster with many ipvs services),
ipvs estimation may not be needed. So adding a sysctl blob to allow
users to disable this completely.
Default is: 1 (enable)
Cc: yunhong-cgl jiang <xintian1976@gmail.com>
Signed-off-by: Dust Li <dust.li@linux.alibaba.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'Documentation/networking/ipvs-sysctl.rst')
| -rw-r--r-- | Documentation/networking/ipvs-sysctl.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/networking/ipvs-sysctl.rst b/Documentation/networking/ipvs-sysctl.rst index 2afccc63856e..95ef56d62077 100644 --- a/Documentation/networking/ipvs-sysctl.rst +++ b/Documentation/networking/ipvs-sysctl.rst @@ -300,3 +300,14 @@ sync_version - INTEGER Kernels with this sync_version entry are able to receive messages of both version 1 and version 2 of the synchronisation protocol. + +run_estimation - BOOLEAN + 0 - disabled + not 0 - enabled (default) + + If disabled, the estimation will be stop, and you can't see + any update on speed estimation data. + + You can always re-enable estimation by setting this value to 1. + But be careful, the first estimation after re-enable is not + accurate. |