From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44651) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xsw09-000842-HK for qemu-devel@nongnu.org; Mon, 24 Nov 2014 10:56:34 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Xsw08-0003tP-JS for qemu-devel@nongnu.org; Mon, 24 Nov 2014 10:56:33 -0500 Received: from mail-qg0-x236.google.com ([2607:f8b0:400d:c04::236]:51421) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xsw08-0003tE-AD for qemu-devel@nongnu.org; Mon, 24 Nov 2014 10:56:32 -0500 Received: by mail-qg0-f54.google.com with SMTP id q107so6945619qgd.13 for ; Mon, 24 Nov 2014 07:56:31 -0800 (PST) MIME-Version: 1.0 Sender: vase@selfip.ru In-Reply-To: References: From: Vasiliy Tolstov Date: Mon, 24 Nov 2014 19:56:16 +0400 Message-ID: Content-Type: text/plain; charset=UTF-8 Subject: Re: [Qemu-devel] strange behavior when using iotune List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Andrey Korolyov Cc: libvir-list@redhat.com, QEMU 2014-11-24 17:18 GMT+03:00 Andrey Korolyov : > I am not sure for friendliness of possible dd interpretations for new > leaky bucket mechanism, as its results can be a little confusing even > for fio (all operations which are above the limit for long-running > test will have 250ms latency, putting down score numbers in most > popular tests like UnixBench), also w/o sync options these results are > almost meaningless. May be fio with direct=1|fsync=1 (for fs) will > give a more appropriate numbers in your case. My fail. I'm forget to add iflag=direct to dd. Now all fine i get is around 20 MB/s which compared to 5000 iops. Thanks. -- Vasiliy Tolstov, e-mail: v.tolstov@selfip.ru jabber: vase@selfip.ru