From owner-freebsd-questions@FreeBSD.ORG Tue Mar 18 08:21:12 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id B756FA9F for ; Tue, 18 Mar 2014 08:21:12 +0000 (UTC) Received: from mail-ob0-x22e.google.com (mail-ob0-x22e.google.com [IPv6:2607:f8b0:4003:c01::22e]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 809A6A7A for ; Tue, 18 Mar 2014 08:21:12 +0000 (UTC) Received: by mail-ob0-f174.google.com with SMTP id wo20so6657631obc.5 for ; Tue, 18 Mar 2014 01:21:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=3ENrDprunP+AXbCZVIeGJOArJM7qUTlPglqxQeLOXOk=; b=twJ3wIQZ4qQ0dth+vIt475Mn3DMXB7EYPKTeebxJO41Ickk2We0o6fSd1xGibffsZg 23h3So0kWzZwrURX4xWDklr6J3RUunzKocNYL4MqLicuKs25bxtqeKCnSOg4hTPBceQ0 6Y3ESLpjklfVgxbtebr6J9RH3LTz0wIw99THc8hI82PKbX5U6g/TC3E1oI0GAOv/+J18 6fRnEIElGcUM+k/FKQB776JN5TN+Ng2dQBh13QPKxyslKaVprunM/ZCWWydbx9ApcXNL jL0f9SrLn3r7Akt83QZg31JCVfwp2YZUhqhJYqiGxTNTjSDG7l1q6e6nfklwOeX6dvdW vKcg== X-Received: by 10.60.92.202 with SMTP id co10mr58529oeb.73.1395130871810; Tue, 18 Mar 2014 01:21:11 -0700 (PDT) MIME-Version: 1.0 Received: by 10.76.173.129 with HTTP; Tue, 18 Mar 2014 01:20:51 -0700 (PDT) In-Reply-To: <532711DB.4020606@yeaguy.com> References: <532711DB.4020606@yeaguy.com> From: n j Date: Tue, 18 Mar 2014 09:20:51 +0100 Message-ID: Subject: Re: Monitor IO performance To: User Questions Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.17 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: Tue, 18 Mar 2014 08:21:12 -0000 On Mon, Mar 17, 2014 at 4:16 PM, jv wrote: > 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 ~] Thanks for that. Although various systems could probably range from first-class enterprise storage level to the cheap (oversold) VPS level, this still shows a tremendous difference in performance. Here is today's run: --- /tmp (ufs /dev/ada0s1a) ioping statistics --- 352 requests completed in 4.1 s, 86 iops, 345.9 KiB/s min/avg/max/mdev = 9 us / 11.6 ms / 1.5 s / 85.1 ms What I find especially troublesome is the maximum request time of 1.5s (yesterday's run 681ms). Also the mean deviation seems way too big (85.1ms, yesterday 128.2ms - this is Internet-level latency). I guess I'll have to talk to my VPS provider, though I regret not having taken these statistics before the 10.0 upgrade as well. Regards, -- Nino