Re: [PATCH v4 14/14] SUNRPC: Bump the maximum payload size for the server

Jeff Layton
2025-05-06T13:54:58Z

On Tue, 2025-05-06 at 09:52 -0400, Chuck Lever wrote:
> On 5/6/25 9:34 AM, Christoph Hellwig wrote:
> > On Mon, Apr 28, 2025 at 03:37:02PM -0400, cel@kernel.org wrote:
> > > From: Chuck Lever <chuck.lever@oracle.com>
> > >
> > > Increase the maximum server-side RPC payload to 4MB. The default
> > > remains at 1MB.
> > >
> > > To adjust the operational maximum, shut down the NFS server. Then
> > > echo a new value into:
> > >
> > > /proc/fs/nfsd/max_block_size
> > >
> > > And restart the NFS server.
> >
> > Are you going to wire this up to a config file in nfs-utils that
> > gets set before the daemon starts?
>
> That's up to SteveD -- it might be added to /etc/nfs.conf.
>
>

Can we also add this to the netlink interface for nfsd and nfsdctl?

> > Because otherwise this is a pretty horrible user interface.
>
> This is an API that has existed forever.
>
> I don't even like that this maximum can be tuned. After a period of
> experimentation, I was going to set the default to a higher value and
> be done with it, because I can't think of a reason why it needs to be
> shifted up or down after that.
>

--
Jeff Layton <jlayton@kernel.org>