In the last episode (Apr 14), Alfred Perlstein said:
> * Robert Blayzor [080414 06:07] wrote:
> > On Apr 14, 2008, at 7:02 AM, Nawfal bin Mohmad Rouyan wrote:
> > >I'm using TCP and the entry in /etc/fstab on all clients is as below:
> > >
> > >build:/usr/ports /usr/ports nfs tcp,intr,nfsv3,-w=32768,-r=32768,rw,noauto 0 0
> > >build:/usr/src /usr/src nfs tcp,intr,nfsv3,-w=32768,-r=32768,rw,noauto 0 0
> > >build:/usr/obj /usr/obj nfs tcp,intr,nfsv3,-w=32768,-r=32768,rw,noauto 0 0

> >
> > Are -r and -w really needed/useful for TCP mounts?

>
> yes.


This is interesting: according to mountnfs() in nfs_vfsops.c, those are
already the kernel defaults:

if ((argp->flags & NFSMNT_NFSV3) && argp->sotype == SOCK_STREAM) {
nmp->nm_wsize = nmp->nm_rsize = NFS_MAXDATA;
} else {
nmp->nm_wsize = NFS_WSIZE;
nmp->nm_rsize = NFS_RSIZE;
}

$ grep nfs_maxdata /sys/nfs/*
/sys/nfs/nfsproto.h:#define NFS_MAXDATA 32768

But it looks like /sbin/mount_nfs always overrides them to NFS_WSIZE
and NFS_RSIZE (both 8K) in its nfsdefargs struct.

--
Dan Nelson
dnelson@allantgroup.com
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