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--- vm:proxmox:ceph:performance [2025/10/31 18:57] – niziak
+++ vm:proxmox:ceph:performance [2025/11/01 10:36] (current) – niziak
@@ Line 7: / Line 7: @@
   * [[https://forum.proxmox.com/threads/ceph-storage-performance.129408/#post-566971|Ceph Storage Performance]]
   * [[https://ceph.io/en/news/blog/2024/ceph-a-journey-to-1tibps/|Ceph: A Journey to 1 TiB/s]]
+  * [[https://www.boniface.me/posts/pvc-ceph-tuning-adventures/]]
 ===== Performance tips =====
@@ Line 14: / Line 15: @@
   * adapt PG to number of OSDs to spread traffic evenly
   * use ''krbd''
+  * more OSD = better parallelism
   * enable ''writeback'' on VMs (possible data loss on consumer SSDs)
   * MTU 9000 (jumbo frames) [[https://ceph.io/en/news/blog/2015/ceph-loves-jumbo-frames/|Ceph Loves Jumbo Frames]]
+  * net latency <200us (''ping -s 1000 pve'')
   * [[https://ceph.io/en/news/blog/2024/ceph-a-journey-to-1tibps/|Ceph: A Journey to 1 TiB/s]]
-    * Ceph is incredibly sensitive to latency introduced by CPU c-state transitions. Set ''Max perf'' in BIOS to disable C-States or boot Linux with ''''/
+    * Ceph is incredibly sensitive to latency introduced by CPU c-state transitions. Set ''Max perf'' in BIOS to disable C-States or boot Linux with ''GRUB_CMDLINE_LINUX="idle=poll intel_idle.max_cstate=0 intel_pstate=disable processor.max_cstate=1" ''
     * Disable IOMMU in kernel