The default stack size in Fedora/RHEL is 8M, which means when ovs-vswitchd
daemon starts and uses --mlockall (default), it will dirty all memory
regions for all threads which is proportionally to the number of CPUs.
On a big host this increases memory usage to many hundreds of megabytes
while OVS actually requires much less.
This patch relies on systemd to limit to 2M/thread. That is much more
than the minimum documented at function ovs_thread_create():
/* Some small systems use a default stack size as small as 80 kB, but OVS
* requires approximately 384 kB according to the following analysis:
* https://mail.openvswitch.org/pipermail/ovs-dev/2016-January/308592.html
*
* We use 512 kB to give us some margin of error. */
Signed-off-by: Flavio Leitner <[email protected]>
---
rhel/usr_lib_systemd_system_ovs-vswitchd.service.in | 1 +
1 file changed, 1 insertion(+)
diff --git a/rhel/usr_lib_systemd_system_ovs-vswitchd.service.in
b/rhel/usr_lib_systemd_system_ovs-vswitchd.service.in
index 525deae0b..317aa993c 100644
--- a/rhel/usr_lib_systemd_system_ovs-vswitchd.service.in
+++ b/rhel/usr_lib_systemd_system_ovs-vswitchd.service.in
@@ -14,6 +14,7 @@ Environment=XDG_RUNTIME_DIR=/var/run/openvswitch
EnvironmentFile=/etc/openvswitch/default.conf
EnvironmentFile=-/etc/sysconfig/openvswitch
EnvironmentFile=-/run/openvswitch/useropts
+LimitSTACK=2M
@begin_dpdk@
ExecStartPre=-/bin/sh -c '/usr/bin/chown :$${OVS_USER_ID##*:} /dev/hugepages'
ExecStartPre=-/usr/bin/chmod 0775 /dev/hugepages
--
2.20.1
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