From f2605e928136f88032ef9b4977a076d5c535987b Mon Sep 17 00:00:00 2001 From: Julia Kreger Date: Wed, 26 Apr 2023 07:34:29 -0700 Subject: Remove use of nomodeset by default The troubleshooting kernel command line option nomodeset unfortunately changes the way framebuffer interactions work with graphics devices which in some cases can result in kernel memory to be used for graphics updates. When this happens on some specific hardware common in rack mount servers with baseboard management controllers, this can cause the memory bus to become locked for a brief time while the graphics update is occuring. This locked memory bus means disk IO can become blocked, and network cards can overflow their buffers resulting in packet loss on top of the latency incurred by the graphics update executing. As such, we've removed the nomodeset option from default usage and added a note describing its removal to the documentation along with a release note. Change-Id: I9084d88c3ec6f13bd64b8707892758fa87dd7f86 --- ironic/conf/redfish.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'ironic/conf/redfish.py') diff --git a/ironic/conf/redfish.py b/ironic/conf/redfish.py index 3cc9fe015..68aa96141 100644 --- a/ironic/conf/redfish.py +++ b/ironic/conf/redfish.py @@ -64,7 +64,7 @@ opts = [ 'auto-expire. Applies only when `use_swift` is ' 'enabled.')), cfg.StrOpt('kernel_append_params', - default='nofb nomodeset vga=normal', + default='nofb vga=normal', mutable=True, help=_('Additional kernel parameters to pass down to the ' 'instance kernel. These parameters can be consumed by ' -- cgit v1.2.1