High load average inside idle FreeBSD guest running on bhyve

[Christian Laursen]

Hello

I have a few bhyve instances running that all seem to have a higher load 
average than what would seem normal for a system that is idle.

The host is running FreeBSD 10.1-BETA3 #2 r272300.

FreeBSD 10.1-BETA3 #2 r272300: Tue Sep 30 16:26:53 CEST 2014
     root at trill.borderworlds.dk:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
CPU: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (3411.56-MHz K8-class CPU)
   Origin = "GenuineIntel"  Id = 0x206a7  Family = 0x6  Model = 0x2a 
Stepping = 7
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x1fbae3ff<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX>
   AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
   AMD Features2=0x1<LAHF>
   VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID
   TSC: P-state invariant, performance statistics


The guests are all running FreeBSD 10.0-RELEASE-p9 updated via 
freebsd-update.

The head of the top output inside a guest:

last pid:  6109;  load averages:  0.41,  0.38,  0.39    up 1+14:27:48  
09:56:25
24 processes:  1 running, 23 sleeping
CPU:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% idle
Mem: 6392K Active, 437M Inact, 379M Wired, 420M Buf, 3120M Free
Swap: 4096M Total, 4096M Free

I would have expected a load average around 0.00. Am I doing something 
wrong or is there something else that could be causing this?

The guests all seem responsive and otherwise work fine.

Apart from this I haven't encountered any problems when working with 
bhyve. It's nice and easy to work with. Thanks a lot for bringing this 
to FreeBSD.

-- 
Christian Laursen