I'm running an 11.0-CURRENT (from exactly a week ago) on a 32-core
(16-module) AMD Bulldozer system.
Guest is NetBSD 7.99.21 HEAD, with timecounter hard-forced to
ACPI-safe instead of hpet (HPET seemed unstable, although HPET is
being used in the host FreeBSD).
I start bhyve using a simple script:
#!/bin/sh
RAM=8192M
VM=netbsd
VMROOT=/usr/local/vm
CPUS=8
grub-bhyve -m ${VMROOT}/${VM}/device.map -d ${VMROOT}/${VM} -M ${RAM} ${VM}
exec bhyve -A -H -P -w -u -s 0:0,amd_hostbridge -s 1:0,lpc -s
2:0,virtio-net,tap0 -s 3:0,virtio-blk,/dev/zvol/pool/vm/${VM},nocache
-s 4:0,virtio-rnd -l com1,stdio -c ${CPUS} -m ${RAM} ${VM}
While the guest is entirely idle:
37975 root 1 20 0 13084K 3016K wait 31 0:00 0.00% sh
load averages: 0.00, 0.00, 0.00; up 1+22:00:40
03:34:40
18 processes: 16 sleeping, 2 on CPU
CPU states: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle
Memory: 923M Act, 6996K Wired, 12M Exec, 900M File, 5911M Free
Swap: 8195M Total, 8195M Free
Bhyve itself seems to go bounce around between ~6% CPU usage to 18%:
last pid: 37995; load averages: 0.22, 0.38, 0.41
up 5+20:05:17
21:26:35
24 processes: 1 running, 23 sleeping
CPU: 0.0% user, 0.0% nice, 0.5% system, 0.1% interrupt, 99.4% idle
Mem: 2572M Active, 5735M Inact, 19G Wired, 61M Buf, 35G Free
ARC: 14G Total, 3656M MFU, 10G MRU, 16K Anon, 128M Header, 566M Other
Swap: 64G Total, 64G Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
18577 root 18 20 0 9247M 5048M kqread 15 427:55 18.65% bhyve
Any ideas to help troubleshoot where the CPU usage is going, DTrace?
Thanks!
-Dustin
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