From 47012c52a8b0bf9dcc264c5d69110f753ebf0bfe Mon Sep 17 00:00:00 2001
From: Peter Roth <peter@roth.su>
Date: Mon, 20 Nov 2023 14:10:47 +0100
Subject: [PATCH] Document GH#1505, bind() bug in kernel 6.0

---
 KNOWN_ISSUES.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/KNOWN_ISSUES.md b/KNOWN_ISSUES.md
index dde24d5..00d5d7f 100644
--- a/KNOWN_ISSUES.md
+++ b/KNOWN_ISSUES.md
@@ -13,3 +13,8 @@
   **Effected Versions:** 4.10.0-0.okd-2022-03-07-131213
   **Description:** Due to kernel 4.16 bug CephFS mounts get invalid permissions, so writing to image registry backed by CephFS fails on OKD 4.10
   **Workaround**: In `ceph-csi-cephfs` installation add `wsync` to `kernelMountOptions`
+
+## [Ceph service performance degradation](https://github.com/okd-project/okd/issues/1505)
+  **Effected Versions:** 4.11.0-0.okd-2023-01-14-152430, 4.12.0-0.okd-2023-02-04-212953
+  **Description:** Due to kernel 6.0 bug with bind(), the Ceph service faces radical performance degradation, causing PG unavailability, very slow I/O operations.
+  **Workaround**: Either build a custom [FCOS image using layering](https://docs.okd.io/4.12/post_installation_configuration/coreos-layering.html) or update to a newer version.
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