From db7887cafd39f3f4d2d634a8ea3732bf4f9bb7dc Mon Sep 17 00:00:00 2001 From: Balazs Gibizer Date: Mon, 28 Jun 2021 14:58:57 +0200 Subject: [PATCH] Add limitation about QoS min bw for PF less SRIOV platforms Related-Bug: #1915255 Change-Id: I2bd386e9aaa4d1cf994943b59f82bc24f6424199 --- doc/source/admin/config-qos-min-bw.rst | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/doc/source/admin/config-qos-min-bw.rst b/doc/source/admin/config-qos-min-bw.rst index c84815a3d5c..37bcb9d0573 100644 --- a/doc/source/admin/config-qos-min-bw.rst +++ b/doc/source/admin/config-qos-min-bw.rst @@ -125,6 +125,14 @@ Limitations treats physnet0 and Physnet0 as the same physnet. It is advised not to use physnet names that are only differ by case. +* There are hardware platforms (e.g.: Cavium ThunderX) where it's possible + to have virtual functions which are network devices that are not associated + to a physical function. As bandwidth resources are tracked per physical + function, for such hardware the placement enforcement of the QoS minimum + bandwidth rules cannot be supported. Creating a server with ports using such + QoS policy targeting such hardware backend will result in a ``NoValidHost`` + error during scheduling. + Placement pre-requisites ------------------------