From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre DERUMIER Subject: Re: speed decrease since firefly,giant,hammer the 2nd try Date: Wed, 11 Feb 2015 08:44:12 +0100 (CET) Message-ID: <1998825137.362471.1423640652791.JavaMail.zimbra@oxygem.tv> References: <54DA541E.9000608@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mailpro.odiso.net ([89.248.209.98]:58589 "EHLO mailpro.odiso.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750823AbbBKHoO convert rfc822-to-8bit (ORCPT ); Wed, 11 Feb 2015 02:44:14 -0500 In-Reply-To: <1971513819.362434.1423640637237.JavaMail.zimbra@oxygem.tv> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Stefan Priebe Cc: ceph-devel >>same fio, same qemu, same vm, same host, same ceph dumpling storage,=20 >>different librados / librbd: 16k iop/s for random 4k writes >> >>What's wrong with librbd / librados2 since firefly? Maybe could we bissect this ? Maybe testing intermediate librbd releases between dumpling and firefly= , http://gitbuilder.ceph.com/ceph-deb-wheezy-x86_64-basic/ref/ could we give us an hint. ----- Mail original ----- De: "Stefan Priebe" =C3=80: "ceph-devel" Envoy=C3=A9: Mardi 10 F=C3=A9vrier 2015 19:55:26 Objet: speed decrease since firefly,giant,hammer the 2nd try Hello,=20 last year in june i already reported this but there was no real result.= =20 (http://lists.ceph.com/pipermail/ceph-users-ceph.com/2014-July/041070.h= tml)=20 I then had the hope that this will be fixed itself when hammer is=20 released. Now i tried hammer an the results are bad as before.=20 Since firefly librbd1 / librados2 are 20% slower for 4k random iop/s=20 than dumpling - this is also the reason why i still stick to dumpling.=20 I've now modified my test again to be a bit more clear.=20 Ceph cluster itself completely dumpling.=20 librbd1 / librados from dumpling (fio inside qemu): 23k iop/s for rando= m=20 4k writes=20 - stopped qemu=20 - cp -ra firefly_0.80.8/usr/lib/librados.so.2.0.0 /usr/lib/=20 - cp -ra firefly_0.80.8/usr/lib/librbd.so.1.0.0 /usr/lib/=20 - start qemu=20 same fio, same qemu, same vm, same host, same ceph dumpling storage,=20 different librados / librbd: 16k iop/s for random 4k writes=20 What's wrong with librbd / librados2 since firefly?=20 Greets,=20 Stefan=20 --=20 To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n=20 the body of a message to majordomo@vger.kernel.org=20 More majordomo info at http://vger.kernel.org/majordomo-info.html=20 -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html