From fb415375551fdc2a3763e62f7bef5fdeec4cd34b Mon Sep 17 00:00:00 2001
From: Markus Hilger <markus.hilger@megware.com>
Date: Wed, 15 Jul 2026 03:26:02 +0200
Subject: [PATCH] Increase net.core.rmem_max to 4 MB

This was introduced 8 years ago. Newer OSs have 4194304 as default.
Confluent shouldn't decrease the default.

RHEL 8           212992
RHEL 9          2097152
RHEL 10         2097152
Fedora 44       4194304

Ubuntu 24.04     212992
Ubuntu 26.06    4194304

SLES 15          212992
SLES 16          212992

It was changed to 4MB in upstream kernel, too:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a6d4f25888b83b8300aef28d9ee22765c1cc9b34
---
 confluent_server/sysctl/confluent.conf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/confluent_server/sysctl/confluent.conf b/confluent_server/sysctl/confluent.conf
index 3559d158..8b9dbba0 100644
--- a/confluent_server/sysctl/confluent.conf
+++ b/confluent_server/sysctl/confluent.conf
@@ -1,2 +1,2 @@
 # Increase available receive buffers for discovery scans
-net.core.rmem_max = 2097152
+net.core.rmem_max = 4194304