From: Dave Barach <dave@barachs.net>
Date: Tue, 28 Jan 2025 16:49:57 +0000 (-0500)
Subject: vpp_config: leave vm.max_map_count alone by default
X-Git-Tag: v25.10-rc0~244
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=81996c1970b7db39f1ffe7a919bbb3a3ab9a0740;p=vpp.git

vpp_config: leave vm.max_map_count alone by default

Do not set vm.max_map_count to 3096 by default. That value is an order
of magnitude smaller than current distro defaults, and causes
seemingly "random" severe application failures; known to occur when
running Brave, Firefox, and VirtualBox to name but a few.

Type: fix

Change-Id: Ibe7518d92c3be9a4704972c9d504777776f924dc
Signed-off-by: Dave Barach <dave@barachs.net>
---

diff --git a/src/vpp/conf/80-vpp.conf b/src/vpp/conf/80-vpp.conf
index 2207e2e3824..8971d9a1ce9 100644
--- a/src/vpp/conf/80-vpp.conf
+++ b/src/vpp/conf/80-vpp.conf
@@ -1,8 +1,13 @@
 # Number of 2MB hugepages desired
 vm.nr_hugepages=1024
 
-# Must be greater than or equal to (2 * vm.nr_hugepages).
-vm.max_map_count=3096
+# The vm max_map_count must be greater than or equal to (2 * vm.nr_hugepages).
+
+# The system default is often an order of magnitude greater than the
+# value below. If you uncomment this stanza and reboot as-is, watch
+# out for seemingly "random" severe application failures; known to
+# occur in Brave, Firefox, and VirtualBox to name but a few.
+# vm.max_map_count=3096
 
 # All groups allowed to access hugepages
 vm.hugetlb_shm_group=0