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handbook/virtualization: add note on workaround for Parallels 

A user reported high CPU utilization on a fresh install of 14.0
on Parallels (MacOS, M1/Apple Silicon).  Disabling the new ACPI
ged(4) device worked around the problem.  Document this (for now).

Reviewed by:	pauamma_gundo.com
Differential Revision:	https://reviews.freebsd.org/D45103
This commit is contained in:
Mike Karels 2024-05-07 17:09:06 -05:00
parent e0261cb5da
commit 3c1326a472
1 changed files with 7 additions and 0 deletions
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documentation/content/en/books/handbook/virtualization/_index.adoc
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@ -136,6 +136,13 @@ kern.hz=100
+
Without this setting, an idle FreeBSD Parallels guest will use roughly 15% of the CPU of a single processor iMac(R).
After this change the usage will be closer to 5%.
+
If installing FreeBSD 14.0 or later, and CPU utilization is still high, add the following additional line to [.filename]#/boot/loader.conf#:
+
[.programlisting]
....
debug.acpi.disabled="ged"
....
. Create a New Kernel Configuration File
+
All of the SCSI, FireWire, and USB device drivers can be removed from a custom kernel configuration file.