Re: NFSv4 client hung

Hi Rick! Thank you for the answer.

I also think that it has nothing to do with the server because there’s
other nfs client (also running vms with bhyve) that keeps running.

To make sure that I understood, in my setup the nfs client is a physical
host that mount nfs share with vms disks. Then I run those vms with bhyve,
that vms does not mount any nfs share.
The hang happens when I try to access the nfs mounted shares in the
physical host and (i think) as consequences the vms also freeze when trying
to do io.

Your suggestion is to increase the amount of memory of the vms ?

For educational purposes, can you point me the code part that uses newbuf
so i can try to learn something?

Ale

On Mon, 1 Sep 2025 at 22:49 Rick Macklem <rick.macklem@gmail.com> wrote:

> For some reason, I cannot reply to your email
> (might be the size of it), so I'll post a simple
> comment.
>
> As you noted, processed are stuck on newbuf in
> the client. This probably has nothing to do with
> the server. It also looks like the clients are bhyve.
>
> Bump the memory size of the bhyve clients up,
> maybe way up.
> --> There are ways to tune the size of the buffer
>       cache, but bumping up the VM's ram should
>       give you more.
>
> rick
>