From owner-freebsd-stable@FreeBSD.ORG Fri May 29 09:40:39 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C2F58106566C for ; Fri, 29 May 2009 09:40:39 +0000 (UTC) (envelope-from petefrench@ticketswitch.com) Received: from constantine.ticketswitch.com (constantine.ticketswitch.com [IPv6:2002:57e0:1d4e:1::3]) by mx1.freebsd.org (Postfix) with ESMTP id 865408FC0A for ; Fri, 29 May 2009 09:40:39 +0000 (UTC) (envelope-from petefrench@ticketswitch.com) Received: from dilbert.rattatosk ([10.64.50.6] helo=dilbert.ticketswitch.com) by constantine.ticketswitch.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.69 (FreeBSD)) (envelope-from ) id 1M9yZq-0002xA-48; Fri, 29 May 2009 10:40:38 +0100 Received: from petefrench by dilbert.ticketswitch.com with local (Exim 4.69 (FreeBSD)) (envelope-from ) id 1M9yZq-000Pjq-2s; Fri, 29 May 2009 10:40:38 +0100 To: dan.naumov@gmail.com In-Reply-To: Message-Id: From: Pete French Date: Fri, 29 May 2009 10:40:38 +0100 Cc: freebsd-stable@freebsd.org Subject: Re: ZFS on top of GELI / Intel Atom 330 system X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2009 09:40:40 -0000 > Ouch, that does indeed sounds quite slow, especially considering that > a dual core Athlon 6400 is pretty fast CPU. Have you done any > comparison benchmarks between UFS2 with Softupdates and ZFS on the Not at all - but, now you have got me curious, I just went to a completely different system (four core opteron box, no ecnryption, four 15k SCSI drives and a zpool of 2 mirrored pairs), and that also gave me about 25 meg/second! I am using the wildly unscientific "how long to copy a file" method to benchmark here, with the file residing on a different drive, which can provided it at 80 meg/second. > same system? What are the read/write numbers like? Have you done any > investigating regarding possible causes of ZFS working so slow on your > system? Just wondering if its an ATA chipset problem, a drive problem, > a ZFS problem or what... I have no idea, and now I think I need to look into it! certainly I should be getting better than 25 meg/sec out of the 15K SCSI's. -pete.