From owner-svn-src-all@FreeBSD.ORG Sun Aug 10 20:05:13 2014 Return-Path: Delivered-To: svn-src-all@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 ESMTPS id AE866568 for ; Sun, 10 Aug 2014 20:05:13 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 83B952911 for ; Sun, 10 Aug 2014 20:05:13 +0000 (UTC) Received: from rmacklem (uid 1196) (envelope-from rmacklem@FreeBSD.org) id 29ab by svn.freebsd.org (DragonFly Mail Agent v0.9+); Sun, 10 Aug 2014 20:05:13 +0000 From: Rick Macklem Date: Sun, 10 Aug 2014 20:05:13 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r269788 - head/usr.sbin/nfsd X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Message-Id: <53e7d079.29ab.511a0bf3@svn.freebsd.org> X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 10 Aug 2014 20:05:13 -0000 Author: rmacklem Date: Sun Aug 10 20:05:13 2014 New Revision: 269788 URL: http://svnweb.freebsd.org/changeset/base/269788 Log: Document the use of the vfs.nfsd sysctls that control the size of the NFS server's DRC for TCP. This is a content change. MFC after: 1 week Modified: head/usr.sbin/nfsd/nfsd.8 Modified: head/usr.sbin/nfsd/nfsd.8 ============================================================================== --- head/usr.sbin/nfsd/nfsd.8 Sun Aug 10 18:13:50 2014 (r269787) +++ head/usr.sbin/nfsd/nfsd.8 Sun Aug 10 20:05:13 2014 (r269788) @@ -28,7 +28,7 @@ .\" @(#)nfsd.8 8.4 (Berkeley) 3/29/95 .\" $FreeBSD$ .\" -.Dd July 18, 2014 +.Dd August 10, 2014 .Dt NFSD 8 .Os .Sh NAME @@ -175,6 +175,24 @@ utility would then be used to block nfs-related packets that come in on the outside interface. .Pp +If the server has stopped servicing clients and has generated a console message +like +.Dq Li "nfsd server cache flooded..." , +the value for vfs.nfsd.tcphighwater needs to be increased. +This should allow the server to again handle requests without a reboot. +Also, you may want to consider decreasing the value for +vfs.nfsd.tcpcachetimeo to several minutes (in seconds) instead of 12 hours +when this occurs. +.Pp +Unfortunately making vfs.nfsd.tcphighwater too large can result in the mbuf +limit being reached, as indicated by a console message +like +.Dq Li "kern.ipc.nmbufs limit reached" . +If you cannot find values of the above +.Nm sysctl +values that work, you can disable the DRC cache for TCP by setting +vfs.nfsd.cachetcp to 0. +.Pp The .Nm utility has to be terminated with