From owner-freebsd-questions@FreeBSD.ORG Mon Mar 17 14:42:31 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 B4492833 for ; Mon, 17 Mar 2014 14:42:31 +0000 (UTC) Received: from mail-oa0-x230.google.com (mail-oa0-x230.google.com [IPv6:2607:f8b0:4003:c02::230]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 80575C4E for ; Mon, 17 Mar 2014 14:42:31 +0000 (UTC) Received: by mail-oa0-f48.google.com with SMTP id m1so5691825oag.35 for ; Mon, 17 Mar 2014 07:42:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:from:date:message-id:subject:to:content-type; bh=hYZJJ7X36PiwKuLJ0KAIVAY7vnAelcjVOn7XjEnUH/8=; b=dxEsPWCqdIXS35ROonRuq5ZBDn+YeYgHKhFWpqr0TmFAeWYTC62AlDT/UqwmN1gNCH FLSovTwHFJ2MvOeE87JNY8Q4N6A22ENduj9l+6E8yHysUV9W0iS2/66lBT/Ohvdh2Cru SJCHaP269vogWYBRjJOZHueoCu0anzSZS/GIRmlpVw4Hfbr4w+VnLbT8grre40cMSI0k S6y89YvW0EZ39j0s4quleoS8OPsBKnSPY95lvafCAh7ESXfcL83eVl0KdAoOc+YSZinp AvhNhvpC8GXKeG9pSEjwACmOA+1cO6Yy3yOMP7YucCZ467J0Van2lgvx+fUSWxvN91+4 LwsA== X-Received: by 10.60.162.7 with SMTP id xw7mr21005835oeb.13.1395067350912; Mon, 17 Mar 2014 07:42:30 -0700 (PDT) MIME-Version: 1.0 Received: by 10.76.173.129 with HTTP; Mon, 17 Mar 2014 07:42:10 -0700 (PDT) From: n j Date: Mon, 17 Mar 2014 15:42:10 +0100 Message-ID: Subject: 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: Mon, 17 Mar 2014 14:42:31 -0000 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, -- Nino