From owner-freebsd-fs@FreeBSD.ORG  Sun Sep  1 19:11:20 2013
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id 7379ED0B
 for <freebsd-fs@freebsd.org>; Sun,  1 Sep 2013 19:11:20 +0000 (UTC)
 (envelope-from to.my.trociny@gmail.com)
Received: from mail-ee0-x231.google.com (mail-ee0-x231.google.com
 [IPv6:2a00:1450:4013:c00::231])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 0435A208C
 for <freebsd-fs@freebsd.org>; Sun,  1 Sep 2013 19:11:19 +0000 (UTC)
Received: by mail-ee0-f49.google.com with SMTP id d41so1930469eek.36
 for <freebsd-fs@freebsd.org>; Sun, 01 Sep 2013 12:11:18 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=sender:date:from:to:cc:subject:message-id:references:mime-version
 :content-type:content-disposition:in-reply-to:user-agent;
 bh=45ppacPuUey+7gqwXij2grpafrlALoO0KIX3rv/GJFA=;
 b=s9Yqi0dvR9rsKg57exxAEENN+uHpXTesfyZtNdHpx3NATViYgxNc7LCD3GLQ+uWmI7
 wzeJJUeqNJjY3IugV9mWlmDYOJvWgPpi8/IS28Je6mDV8OuVdjGBYchCUFSP9TZyIp+r
 Nu56mcZY4I79LxqW3MMjkTZJf9CdtlnSSHZaPAmjXeXlDlgVcSkRwmx0UluYE65UuyGo
 GQqkA779oHzMYVCQ30e84nhBoGypQcCf+DGP4caKp5PfiUs2z6TNoucs99+EQarJGB11
 bHbipG0UwmPOfGAbuR77PfEuAu1qAwNLVT65HS0WWdk6GZGIxyN6ThOZI3Gr3vjqRFss
 qH5Q==
X-Received: by 10.15.35.196 with SMTP id g44mr30866529eev.18.1378062678376;
 Sun, 01 Sep 2013 12:11:18 -0700 (PDT)
Received: from localhost ([178.150.115.244])
 by mx.google.com with ESMTPSA id bn13sm15603035eeb.11.1969.12.31.16.00.00
 (version=TLSv1.2 cipher=ECDHE-RSA-RC4-SHA bits=128/128);
 Sun, 01 Sep 2013 12:11:17 -0700 (PDT)
Sender: Mikolaj Golub <to.my.trociny@gmail.com>
Date: Sun, 1 Sep 2013 22:11:14 +0300
From: Mikolaj Golub <trociny@FreeBSD.org>
To: "Sam Fourman Jr." <sfourman@gmail.com>
Subject: Re: NFS on ZFS pure SSD pool
Message-ID: <20130901191113.GC15654@gmail.com>
References: <CAOFF+Z2C26V3Ktuvj5RFwGN+H657OPXm796TqA54xOpQj1TVFg@mail.gmail.com>
 <258054624.15907722.1377905324980.JavaMail.root@uoguelph.ca>
 <20130901181630.GB15654@gmail.com>
 <CAOFF+Z02Z+AezgQ9WufbB40P00qDL2i3iqpAfJUfbMfJ-gSeTw@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAOFF+Z02Z+AezgQ9WufbB40P00qDL2i3iqpAfJUfbMfJ-gSeTw@mail.gmail.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Cc: FreeBSD FS <freebsd-fs@freebsd.org>
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 01 Sep 2013 19:11:20 -0000

On Sun, Sep 01, 2013 at 02:28:45PM -0400, Sam Fourman Jr. wrote:

> > BTW, I noticed that nfsd sets listen backlog to 5. Isn't it a bit low
> > for servers that might have hundreds clients?
> >
> 
> is there a sysctl to increase the listen backlog for nfsd?

No. It is hardcoded to 5 in nfsd.c. If it had been set to -1 instead,
the system default would have been used and could be tuned
(kern.ipc.soacceptqueue).

But my note was just an observation and I am not sure this makes any
difference in your case, without seeing netstat output.

-- 
Mikolaj Golub