From: Ken Dreyer <kdreyer@redhat.com>
Date: Fri, 3 Mar 2017 18:20:05 +0000 (-0700)
Subject: avoid setting vfs_cache_pressure
X-Git-Tag: v2.2.0rc1~12^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=a77cd4be5e2365efd60047d7eb6dd1972e200f83;p=ceph-ansible.git

avoid setting vfs_cache_pressure

From Josh Durgin, "I'd recommend not setting vfs_cache_pressure in
ceph-ansible. The syncfs issue is still there, and has caused real
problems in the past, whereas there hasn't been good data showing lower
vfs_cache_pressure is very helpful - the only cases I'm aware of have
shown it makes little difference to performance."

https://bugzilla.redhat.com/show_bug.cgi?id=1395451
---

diff --git a/group_vars/all.yml.sample b/group_vars/all.yml.sample
index 3c09f7c4d..c56ba8063 100644
--- a/group_vars/all.yml.sample
+++ b/group_vars/all.yml.sample
@@ -383,7 +383,6 @@ dummy:
 #  - { name: kernel.pid_max, value: 4194303 }
 #  - { name: fs.file-max, value: 26234859 }
 #  - { name: vm.zone_reclaim_mode, value: 0 }
-#  - { name: vm.vfs_cache_pressure, value: 50 }
 #  - { name: vm.swappiness, value: 10 }
 #  - { name: vm.min_free_kbytes, value: "{{ vm_min_free_kbytes }}" }
 
diff --git a/roles/ceph-common/defaults/main.yml b/roles/ceph-common/defaults/main.yml
index 3f5f2fe2d..c3753cba8 100644
--- a/roles/ceph-common/defaults/main.yml
+++ b/roles/ceph-common/defaults/main.yml
@@ -375,7 +375,6 @@ os_tuning_params:
   - { name: kernel.pid_max, value: 4194303 }
   - { name: fs.file-max, value: 26234859 }
   - { name: vm.zone_reclaim_mode, value: 0 }
-  - { name: vm.vfs_cache_pressure, value: 50 }
   - { name: vm.swappiness, value: 10 }
   - { name: vm.min_free_kbytes, value: "{{ vm_min_free_kbytes }}" }