Re: How can I get and set the default FreeBSD NFSv4 server TCP block size?

Rick Macklem <[email protected]>
Newsgroups gmane.os.freebsd.devel.hackers
Message-ID <CAM5tNy7_EsvOjKftkX+vnM0y9O9oyJ2WTP33K-H3Te5e3xxNfg@mail.gmail.com>
On Mon, Mar 16, 2026 at 12:59 AM Cedric Blancher
<[email protected]> wrote:
>
> Good morning!
>
> How can I get and set the default FreeBSD NFSv4 server TCP block size?
I assume you mean the maximum read/write data size..
# sysctl vfs.nfsd.srvmaxio
It can be set up to 1Mbyte via this line in /etc/rc.conf
nfs_server_maxio=<N>

> What is the current limit (LInux uses 1MB, Windows Server 2025 16MB)?
128Kbytes and can be increased to 1Mbyte.
(Setting greater than 1Mbyte will require a patch to ZFS, since it
crashes when set to greater than 1Mbyte. That is why you cannot
currently set it to greater than 1Mbyte.)

rick

>
> Ced
> --
> Cedric Blancher <[email protected]>
> [https://plus.google.com/u/0/+CedricBlancher/]
> Institute Pasteur
>
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