From owner-freebsd-scsi@FreeBSD.ORG Tue Nov 20 22:23:01 2012 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 87753692 for ; Tue, 20 Nov 2012 22:23:01 +0000 (UTC) (envelope-from peter@pean.org) Received: from system.jails.se (system.jails.se [IPv6:2001:16d8:cc1e:1::1]) by mx1.freebsd.org (Postfix) with ESMTP id 410E98FC08 for ; Tue, 20 Nov 2012 22:23:00 +0000 (UTC) Received: from localhost (system.jails.se [91.205.63.85]) by system.jails.se (Postfix) with SMTP id 0226B1B6F39 for ; Tue, 20 Nov 2012 23:22:56 +0100 (CET) Received: from klein.pean.org (c-a104e155.166-7-64736c14.cust.bredbandsbolaget.se [85.225.4.161]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by system.jails.se (Postfix) with ESMTPSA id DE1811B6F35 for ; Tue, 20 Nov 2012 23:22:55 +0100 (CET) From: =?iso-8859-1?Q?Peter_Ankerst=E5l?= Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Subject: Slow writes with iSCSI. Message-Id: <36ADB83B-B6E4-435A-A910-E20F9A060307@pean.org> Date: Tue, 20 Nov 2012 23:22:56 +0100 To: freebsd-scsi@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 6.2 \(1499\)) X-Mailer: Apple Mail (2.1499) X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Nov 2012 22:23:01 -0000 Hi, I recently posted this to the stable list without any luck:=20 = http://lists.freebsd.org/pipermail/freebsd-stable/2012-November/070607.htm= l At this point I have found out that its only writes that are slow. If = tagging is set to 1 I write about 30MB/s per target and read like 130MB/s per target. If I change tagged openings to 4 (camcontrol tags daX -n 4) I get like = 260MB/s reads per target (which in my case saturates the network at about = 500MB/s) but something like 2-3MB/s writes. I have tried to measure speeds on raw = devices, ZFS and UFS and it gives about the same result. Am I missing something?=20= (my configs are in the original post) Thanks!=