From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe Subject: massive 4k random read drop with next branch Date: Sat, 27 Apr 2013 22:13:33 +0200 Message-ID: <517C316D.6030205@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ph.de-nserver.de ([85.158.179.214]:48117 "EHLO mail-ph.de-nserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753925Ab3D0UNc (ORCPT ); Sat, 27 Apr 2013 16:13:32 -0400 Sender: ceph-devel-owner@vger.kernel.org List-ID: To: "ceph-devel@vger.kernel.org" Hello list, today i was testing next branch against bobtail using a testcluster. I upgraded this bobtail one to next branch. I used QEMU 1.4.1 with librdb (for next branch i applied josh writeback patch). My Testsystem had 5 Hosts with one OSD each and set replication to 2. All values where done with 8 jobs in parallel using fio in Qemu Guest. bobtail: rand 4k: write: io=164316KB, bw=1783KB/s, iops=445, runt= 92136msec rand 4k: read : io=1117MB, bw=12710KB/s, iops=3177, runt= 90028msec seq 4m: write: io=8588MB, bw=97233KB/s, iops=23, runt= 90444msec seq 4m: read : io=83616MB, bw=951227KB/s, iops=232, runt= 90013msec next branch: write: io=177236KB, bw=1963KB/s, iops=490, runt= 90284msec read : io=223628KB, bw=2408KB/s, iops=601, runt= 92875msec write: io=25936MB, bw=294443KB/s, iops=71, runt= 90199msec read : io=69856MB, bw=794585KB/s, iops=193, runt= 90025msec Greets, Stefan