From owner-freebsd-questions@FreeBSD.ORG  Sat May  2 09:22:44 2009
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id A17A81065678
	for <freebsd-questions@freebsd.org>;
	Sat,  2 May 2009 09:22:44 +0000 (UTC)
	(envelope-from frederique@isafeelin.org)
Received: from progress.isafeelin.org (progress.isafeelin.org [84.244.146.92])
	by mx1.freebsd.org (Postfix) with ESMTP id 620768FC2C
	for <freebsd-questions@freebsd.org>;
	Sat,  2 May 2009 09:22:44 +0000 (UTC)
	(envelope-from frederique@isafeelin.org)
Received: from progress.isafeelin.org (localhost [127.0.0.1])
	by progress.isafeelin.org (Postfix) with ESMTP id 627DF130D9B;
	Sat,  2 May 2009 11:22:43 +0200 (CEST)
Received: from s55919a03.adsl.wanadoo.nl (s55919a03.adsl.wanadoo.nl
	[85.145.154.3])
	(using SSLv3 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(No client certificate requested)
	by progress.isafeelin.org (Postfix) with ESMTPSA id 3A49F130D98;
	Sat,  2 May 2009 11:22:43 +0200 (CEST)
Received: from [192.168.1.15] (unknown [192.168.1.15])
	by s55919a03.adsl.wanadoo.nl (Postfix) with ESMTP id 88F6C8CBB8;
	Sat,  2 May 2009 11:22:42 +0200 (CEST)
Message-ID: <49FC10DE.9000401@isafeelin.org>
Date: Sat, 02 May 2009 11:22:38 +0200
From: Frederique Rijsdijk <frederique@isafeelin.org>
User-Agent: Thunderbird 2.0.0.21 (Windows/20090302)
MIME-Version: 1.0
To: nf <nf@wh3rd.net>
References: <e2fbd2a10905011639x475c1fbex92508493449bff51@mail.gmail.com>
In-Reply-To: <e2fbd2a10905011639x475c1fbex92508493449bff51@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Virus-Scanned: ClamAV using ClamSMTP
Cc: freebsd-questions@freebsd.org
Subject: Re: Poor ZFS performance
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 02 May 2009 09:22:45 -0000

nf wrote:
> 733843456 bytes transferred in 61.124812 secs (12005656 bytes/sec)

That is very low. I get about 60MB/sec in this way. Adding bs=1m it'll 
go up to 240MB/sec even (raidz1 with 4*1TB).

> CPU:  0.4% user,  0.0% nice, 14.3% system,  4.5% interrupt, 80.8% idle
> Mem: 1950M Active, 868M Inact, 537M Wired, 238M Cache, 363M Buf, 87M Free
> Swap: 1024M Total, 101M Used, 923M Free, 9% Inuse
> 
>   PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
>  8402 nf          1  50    0  4604K   788K zio->i 0   0:03  8.59% dd

Could you show top -S ?


-- Frederique