From owner-freebsd-questions@FreeBSD.ORG Mon Mar 17 15:17:23 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 164C041F for ; Mon, 17 Mar 2014 15:17:23 +0000 (UTC) Received: from vms173019pub.verizon.net (vms173019pub.verizon.net [206.46.173.19]) by mx1.freebsd.org (Postfix) with ESMTP id E43B2FE5 for ; Mon, 17 Mar 2014 15:17:22 +0000 (UTC) Received: from yeaguy.com ([unknown] [173.60.122.163]) by vms173019.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0N2L00IU66G09750@vms173019.mailsrvcs.net> for freebsd-questions@freebsd.org; Mon, 17 Mar 2014 10:16:53 -0500 (CDT) Received: from yeaguy.com (localhost [127.0.0.1]) by yeaguy.com (Postfix) with ESMTP id 31219112558 for ; Mon, 17 Mar 2014 08:16:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at yeaguy.com Received: from yeaguy.com ([127.0.0.1]) by yeaguy.com (yeaguy.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6LOG4wtXSexc for ; Mon, 17 Mar 2014 08:16:45 -0700 (PDT) Received: from [192.168.1.8] (sabertooth.home [192.168.1.8]) by yeaguy.com (Postfix) with ESMTPSA id DAB7F112531 for ; Mon, 17 Mar 2014 08:16:45 -0700 (PDT) Message-id: <532711DB.4020606@yeaguy.com> Date: Mon, 17 Mar 2014 08:16:43 -0700 From: jv User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-version: 1.0 To: freebsd-questions@freebsd.org Subject: Re: Monitor IO performance References: In-reply-to: Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Mar 2014 15:17:23 -0000 Here is a comparison for you: [vic@yeaguy ~] uname -a FreeBSD yeaguy.com 10.0-RELEASE FreeBSD 10.0-RELEASE #0 r260789: Thu Jan 16 22:34:59 UTC 2014 root@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64 [vic@yeaguy ~] sudo ioping -R /tmp --- /tmp (ufs /dev/ada0p4) ioping statistics --- 1.5 k requests completed in 3.0 s, 516 iops, 2.0 MiB/s min/avg/max/mdev = 187 us / 1.9 ms / 12.5 ms / 2.8 ms [vic@yeaguy ~] On 3/17/2014 7:42 AM, n j wrote: > Hi, > > I'm having issues with IO performance on a 10.0-RELEASE VPS. I suspect my > provider might have oversold the resources. I'd like to collect some > statistics before I send them a complaint. I'd welcome any help or pointers > to links/documentation on how to best test IO performance and collect IO > statistics on a prolonged period (e.g. run something every 2 hours for a > few days or something like that) and actually make some sense out of those > numbers. Right now, I'm thinking about running ioping > (/usr/ports/sysutils/ioping) as I find its output quite clear, but I'm not > sure how good an indicator it is without a benchmark to compare it to. > > Here's a sample run, these numbers look abysmally low to me: > # ioping -R /tmp > --- /tmp (ufs /dev/ada0s1a) ioping statistics --- > 66 requests completed in 3.0 s, 21 iops, 87.8 KiB/s > min/avg/max/mdev = 756 us / 45.6 ms / 681.1 ms / 128.2 ms > > P.S. The problems started some time ago and might also be related to the > 10.0-RELEASE upgrade. I can't really pinpoint if the problems started with > the upgrade or not, but would appreciate info if anyone else experienced > any IO performance degradation after the upgrade. > > Thanks,