From owner-freebsd-performance@FreeBSD.ORG Tue Nov 6 12:28:10 2007 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 062CF16A418 for ; Tue, 6 Nov 2007 12:28:10 +0000 (UTC) (envelope-from nico-freebsd-performance@schottelius.org) Received: from denkbrett.schottelius.org (natgw.netstream.ch [62.65.128.28]) by mx1.freebsd.org (Postfix) with ESMTP id B34E313C4B7 for ; Tue, 6 Nov 2007 12:28:09 +0000 (UTC) (envelope-from nico-freebsd-performance@schottelius.org) Received: by denkbrett.schottelius.org (Postfix, from userid 1000) id AB35413351D; Tue, 6 Nov 2007 13:28:20 +0100 (CET) Date: Tue, 6 Nov 2007 13:28:20 +0100 From: Nico -telmich- Schottelius To: freebsd-performance@freebsd.org Message-ID: <20071106122820.GA28254@schottelius.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="SLDf9lqlvOQaIe6s" Content-Disposition: inline User-Agent: echo $message | gpg -e $sender -s | netcat mailhost 25 X-Unix-Info: http://unix.schottelius.org/ X-Netzseite: http://nico.schottelius.org/ X-System-Info: denkbrett running Linux 2.6.23.1-denkbrett on i686 Subject: Performance of disk i/o with 3ware X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Nov 2007 12:28:10 -0000 --SLDf9lqlvOQaIe6s Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hello! I've the problem that sometimes there are many disk waiting processes (sysctl -n vm.vmtotal), but systat -vmstat shows da0 and da1 busy with 0-10%. I guess that the disk i/o is at about 100%, but wondering why I see those strange values. System Information: - Disks are attached to 07:01.0 RAID bus controller: 3ware Inc 9550SX SATA-= RAID u0216# uname -a = =20 FreeBSD u0216.nshq.netstream.com 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Wed Oc= t 31 14:53:00 CET 2007 root@u0216.nshq.netstream.com:/usr/obj/usr/src/sys/S= MPPAEQUOTA i386 =3D> kernel contains 3ware patches from CVS, marked for inclusion in 6.3, because we've seen many times a freeze on that system before - Disks are 10k rpm sata disks. - Board is a Supermicro X7DB8, processor is a quad core Xeon, E5345@2.33GHz. Anyone an idea, a) why systat -vmstat shows so small busy values? b) how to debug it further? Sincerly Nico --=20 Think about Free and Open Source Software (FOSS). http://nico.schottelius.org/documentations/foss/the-term-foss/ PGP: BFE4 C736 ABE5 406F 8F42 F7CF B8BE F92A 9885 188C --SLDf9lqlvOQaIe6s Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHMF3kuL75KpiFGIwRApMAAJ47e9Vtx5WDrhFYz0TU2/00pyoTYACg1PD5 F+Ii3B6ZjEIom7/KS29Xyc4= =3bQz -----END PGP SIGNATURE----- --SLDf9lqlvOQaIe6s--