Re: BHYVE on NFSv4.2 filesystem?

On May 18, 2026, at 2:26 PM, Dan Shelton <[email protected]> wrote:
> 
> On Fri, 20 Feb 2026 at 01:21, Bakul Shah <[email protected]> wrote:
>> 
>> On Feb 19, 2026, at 11:45 AM, Dan Shelton <[email protected]> wrote:
>>> 
>>> On Wed, 18 Feb 2026 at 22:45, Dan Shelton <[email protected]> wrote:
>>>> 
>>>> Hello,
>>>> 
>>>> Has anyone tried a BHYVE with a disk as file on a NFSv4.2 mount?
>> 
>> Yes. [I tried this on a 15.0-RELEASE-p3 host, nfsv4.2 mounting
>> a filesystem from a 15.0-STABLE machine]
> 
> How about the performance? Is it better than iSCSI?

I don't know about iSCSI but comparing with p9fs:

Test1:
dd bs=1m count=4000 > /dev/null < large-file

nfsV3:
32.3
46.3
51.3

nfsV4:
129.1
59.9
48.8

p9fs:
17.7
17.5
17.6

Test2:
find /usr/src/ > /dev/null

nfsV3:
60.0
39.0
30.9

nfsV4:
54.0
17.9
35.8

p9fs:
6.9
6.5
6.6


So slower in all cases. In addition the variability in nfs numbers is concerning!

p9fs doesn't cache but nfs does, so anything cached is served much faster.