From owner-freebsd-fs@FreeBSD.ORG Fri Feb 10 13:55:28 2012 Return-Path: Delivered-To: fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4F9C0106566B for ; Fri, 10 Feb 2012 13:55:28 +0000 (UTC) (envelope-from ed@hoeg.nl) Received: from mx0.hoeg.nl (mx0.hoeg.nl [IPv6:2a01:4f8:101:5343::aa]) by mx1.freebsd.org (Postfix) with ESMTP id E11108FC08 for ; Fri, 10 Feb 2012 13:55:27 +0000 (UTC) Received: by mx0.hoeg.nl (Postfix, from userid 1000) id 25B9E2A28CCE; Fri, 10 Feb 2012 14:55:27 +0100 (CET) Date: Fri, 10 Feb 2012 14:55:27 +0100 From: Ed Schouten To: fs@freebsd.org Message-ID: <20120210135527.GR1860@hoeg.nl> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="JViz224v3YRbOSfM" Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Cc: Subject: Increase timestamp precision? X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Feb 2012 13:55:28 -0000 --JViz224v3YRbOSfM Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi all, It seems the default timestamp precision sysctl (vfs.timestamp_precision) is currently set to 0 by default, meaning we don't do any sub-second timestamps on files. Looking at the code, it seems that vfs.timestamp_precision=3D1 will let it use a cached value with 1 / HZ precision and it looks like it should have little overhead. Would anyone object if I were to change the default from 0 to 1? --=20 Ed Schouten WWW: http://80386.nl/ --JViz224v3YRbOSfM Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iQIcBAEBAgAGBQJPNSHPAAoJEG5e2P40kaK7jmQP+wXjcKunhXA/kuBJH53bUzXt rAr3mojSf2DxLd+ldJxmbuylszwG6b06IZVK8I7nbQQVZMoZa1x1YhRmnN86Fv9j Sy0a1O+7LF1ddFClIKVasO1ULW+BbaRNTIEjhGqTiXJ4W96HluGSCx2jnaZHCvCE 86vb0QPzBq7Nbfb+n+uMT0JbIy9+z21zoH7TbWTFB9kQoTlX5l0VB7uFOSknvHKQ 3WTwZij90DaF7PfSX/YaksI/FTsG92Pqgm4VRKtzHgzJmRn8+kSvoCu7pEtXM08R +m1jbMQSrPNSueiqMIVNdxridfUiKyjae+gAg+7r3s7RjaiJ/8vSxfJLul3wk5WK FzZhp0CoG+Tetp0310qHummN2MyFtqEXaF5hUSTeK1YWp6m/8CQz3RGHkS7nQD1Q 3VUlcTU66MMRt63MPvswKoIutmzPSufW4zB93F1z9pv5jVdjXfNnieU3rRAGOx7v FfOARp6Vzs5eIUcqFKvWO5x4ob2Jellw/QOSWT2bcF9kKoX3WJdJMo9eCTPP26Py YF77pSCX1WaPTZuecaXFeRpk35QKnqr4VZgBhJ59JqSGooOlSwyUkuID3xsAju+u J/Tgi23KybqHdpZrGkmkmDNtrR96ygBjZKRR93P5UceIIsJ8dPy5Qwk8W9X4KJnJ fLmJz7yK8RTWGrfwqceJ =RWu+ -----END PGP SIGNATURE----- --JViz224v3YRbOSfM--