Date: Sun, 03 Nov 2024 07:45:02 -0800 From: "Chuck Tuffli" <chuck@tuffli.net> To: "FreeBSD virtualization" <freebsd-virtualization@freebsd.org> Subject: CPU count and slow Windows VM Message-ID: <fc813e0d-5c71-450e-a3d8-3d6aa28b1b96@app.fastmail.com>
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I'm helping someone trouble-shoot a sluggish Windows 11 VM running under bhyve (FreeBSD 14.1) related to the number of vCPUs. With 1-2 vCPUs, the VM's performance is reasonable, but adding 8 or more vCPUs makes the VM nearly unusable because even moving the mouse takes minutes.
Before I dig into this, do these symptoms sound familiar? I did find a mention on the wiki (1):
Only one or two VCPUs should be used during installation but this number
can be increased once Windows is installed
Is there something missing from bhyve's emulation that causes this?
TIA
--chuck
(1) https://wiki.freebsd.org/bhyve/Windows
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<!DOCTYPE html><html><head><title></title><style type=3D"text/css">p.Mso=
Normal,p.MsoNoSpacing{margin:0}</style></head><body><div>I'm helping som=
eone trouble-shoot a sluggish Windows 11 VM running under bhyve (FreeBSD=
14.1) related to the number of vCPUs. With 1-2 vCPUs, the VM's performa=
nce is reasonable, but adding 8 or more vCPUs makes the VM nearly unusab=
le because even moving the mouse takes minutes.<br></div><div><br></div>=
<div>Before I dig into this, do these symptoms sound familiar? I did fin=
d a mention on the wiki (1):<br></div><div><br></div><div> &n=
bsp; Only one or two VCPUs should be used during installation but this n=
umber<br></div><div> can be increased once Windows is =
installed<br></div><div><br></div><div>Is there something missing from b=
hyve's emulation that causes this?<br></div><div>TIA<br></div><div><br><=
/div><div>--chuck<br></div><div><br></div><div>(1) <a href=3D"https://wi=
ki.freebsd.org/bhyve/Windows">https://wiki.freebsd.org/bhyve/Windows</a>=
<br></div></body></html>
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