Writing large build logs to NFS extremely slow?

Hi all,

I use a -CURRENT bhyve vm for testing port builds with poudriere. As
this vm is only running when needed, but I want to always have access to
the build logs, I use NFS to mount /usr/local/poudriere/data/logs from
the host.

I noticed some few ports take ridiculously long to build while barely
using any CPU time at all. On a closer look, that's all ports producing
a lot of compiler (warning) output, e.g. gcc, gnutls, gtk2, …

So I assume appending to a large file via NFS gets slower and slower. Is
there any mount option I could try to fix this? Right now I only have
`nolockd`, I also tried `noncontigwr` which didn't change anything.

Thinking about alternatives to NFS, are there any news for client-side
9p virtfs? I found <https://github.com/swills/virtfs-9p-kmod> which
still builds with a few minor adaptions, but trying to mount a 9p share
freezes the machine.

Would you suggest a different mailing list to ask?

BR, Felix

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