Bhyve building kernel....Just an observation

[Allan Jude]

On 2014-10-24 04:05, Willem Jan Withagen wrote:
> Hi,
> 
> Just out of curiosity I did the following:
> 
> Updated 10-STABLE src in both Dom0 and in the Bhyve FreeBSD VM
> Rebooted my bhyve AMD testing machine so it was in a fresh state.
> Nothing special loaded orhter than ZFS.
> 
> And build a 10-STABLE kernel on the raw box, that took about 6 minutes.
> no {make,src}.conf, so the full GENERIC KERNEL
> That took about 6:45 minutes.
> 
> Again rebooted to clean the box up.
> And then booted a 10-STABLE bhyve VM with all memory and processors
> assigned to the VM. So all the power could be available to the VM.
> 
> The build again 10-STABLE in the VM.
> That took about 9:30 minutes.
> 
> Now it looks like the VM has a 50% overhead.
> My expectations were quite a bit better for the performance difference
> between the two?
> 
> Would people with more experience in doing VM stuff expect such a large
> difference?
> Or is this a to be expected result?
> 
> Thanx,
> --WjW
> 
> System info:
> Dom0:
>     11.0-CURRENT FreeBSD 11.0-CURRENT #1 r273066M
>     (110.0 Head with Neel's patch)
>     CPU: AMD Phenom(tm) II X6 1075T Processor (3013.83-MHz K8-class
>     16 Gb Ram
>     ZFS mirror
>         2* 500Gb WD WD5000AA
>         cache 2* Samsung SSD 840 PRO Series DXM05B0Q
> 
> Dom Bhyve
>     FreeBSD 10.0-RELEASE-p9
>     ahci-hd 16GB
> 
> 
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The big difference here is probably disk performance. If you do
something that is pure CPU, you'll usually get about the same
performance as the host, but virtualized disk is not always nearly as good.

-- 
Allan Jude

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