From owner-freebsd-stable@FreeBSD.ORG  Tue Apr 15 03:37:02 2008
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 662C61065675
	for <freebsd-stable@freebsd.org>; Tue, 15 Apr 2008 03:37:02 +0000 (UTC)
	(envelope-from bright@elvis.mu.org)
Received: from elvis.mu.org (elvis.mu.org [192.203.228.196])
	by mx1.freebsd.org (Postfix) with ESMTP id 535E58FC19
	for <freebsd-stable@freebsd.org>; Tue, 15 Apr 2008 03:37:02 +0000 (UTC)
	(envelope-from bright@elvis.mu.org)
Received: by elvis.mu.org (Postfix, from userid 1192)
	id 212701A4D7E; Mon, 14 Apr 2008 20:37:02 -0700 (PDT)
Date: Mon, 14 Apr 2008 20:37:02 -0700
From: Alfred Perlstein <alfred@freebsd.org>
To: Dan Nelson <dnelson@allantgroup.com>
Message-ID: <20080415033702.GY95731@elvis.mu.org>
References: <1208170926.12349.20.camel@nawfal-desktop>
	<1886249E-54FF-4EFE-A7B9-C6AB2488EB4D@inoc.net>
	<20080414232851.GU95731@elvis.mu.org>
	<20080415015928.GB59360@dan.emsphone.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20080415015928.GB59360@dan.emsphone.com>
User-Agent: Mutt/1.4.2.3i
Cc: nawfal@googlemail.com, freebsd-stable@freebsd.org,
	Robert Blayzor <rblayzor.bulk@inoc.net>
Subject: Re: NFS and /etc/exports
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 15 Apr 2008 03:37:02 -0000

* Dan Nelson <dnelson@allantgroup.com> [080414 20:24] wrote:
> In the last episode (Apr 14), Alfred Perlstein said:
> > * Robert Blayzor <rblayzor.bulk@inoc.net> [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.

Yeah, not sure what to make of this. :)

Using packet size greater than 8k for UDP mounts can really make
your life miserable because a single dropped IP packet will
force retransmit of the whole packet.

In my experience when using TCP it's really good to go to 32k.

-- 
- Alfred Perlstein