From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wido den Hollander Subject: Re: massive 4k random read drop with next branch Date: Sat, 27 Apr 2013 23:14:44 +0200 Message-ID: <517C3FC4.5030507@42on.com> References: <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 websrv.42on.com ([31.25.102.167]:39403 "EHLO websrv.42on.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753369Ab3D0VOr (ORCPT ); Sat, 27 Apr 2013 17:14:47 -0400 In-Reply-To: <517C316D.6030205@profihost.ag> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Stefan Priebe Cc: "ceph-devel@vger.kernel.org" On 04/27/2013 10:13 PM, Stefan Priebe wrote: > 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. > I'm not seeing the same. Although my tests were with Bonnie++ I actually noticed a very big increase. The biggest increase was write performance which went up a lot going from Bobtail to next, but with next VMs (Qemu 1.2.2) are a lot more snappier. The benchmarks don't give me a huge difference in read performance, but my VMs feel a lot faster however. Wido > 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 > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Wido den Hollander 42on B.V. Phone: +31 (0)20 700 9902 Skype: contact42on