Date: Fri, 24 Oct 2014 11:18:28 -0400 From: Allan Jude <allanjude@freebsd.org> To: Willem Jan Withagen <wjw@digiware.nl>, virtualization@freebsd.org Subject: Re: Bhyve building kernel....Just an observation Message-ID: <544A6DC4.1090206@freebsd.org> In-Reply-To: <544A6CE2.5020500@digiware.nl> References: <544A083B.50007@digiware.nl> <544A6A3A.2020108@freebsd.org> <544A6CE2.5020500@digiware.nl>
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On 2014-10-24 11:14, Willem Jan Withagen wrote:
> On 24-10-2014 17:03, Allan Jude wrote:
>> 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
>
>> 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.
>
> Would it make any difference to use virtio instead of ahci-hd?
>
> In any case, to test your assumption:
> build a 10G memdisk in Dom0 and DomU
> load it with sources and /usr/obj
> and see if that helps getting things closer?
>
> Nice thing to do during eveninghours in the weekend.
>
> --WjW
>
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>
Doing that would give you a much more accurate benchmark.
--
Allan Jude
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