From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yann Dupont Subject: Re: poor OSD performance using kernel 3.4 => problem found Date: Thu, 31 May 2012 16:42:01 +0200 Message-ID: <4FC78339.10900@univ-nantes.fr> References: <4FBE415E.8030702@profihost.ag> <4FC54CDB.1000506@inktank.com> <4FC5BF27.5060704@profihost.ag> <4FC5C941.6010105@profihost.ag> <4FC5FEC1.90103@profihost.ag> <4FC60FC8.207@inktank.com> <4FC61596.3050703@profihost.ag> <4FC62BB0.1020003@inktank.com> <4FC66A1F.1080407@profihost.ag> <4FC68CAA.9030708@profihost.ag> <4FC7197D.5010406@profihost.ag> <4FC77045.6050907@univ-nantes.fr> <4FC77407.1050401@profihost.ag> <4FC775F3.8080109@univ-nantes.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from smtptls1-lmb.cpub.univ-nantes.fr ([193.52.103.110]:34111 "EHLO smtp-tls.univ-nantes.fr" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752132Ab2EaOmH (ORCPT ); Thu, 31 May 2012 10:42:07 -0400 In-Reply-To: <4FC775F3.8080109@univ-nantes.fr> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Yann Dupont Cc: Stefan Priebe - Profihost AG , Yehuda Sadeh , Stefan Majer , Mark Nelson , ceph-devel@vger.kernel.org On 31/05/2012 15:45, Yann Dupont wrote: > On 31/05/2012 15:37, Stefan Priebe - Profihost AG wrote: > what puzzles me is that this morning, with 3.4.0 it was rbd that was > stable, and now I have the exact contrary. > > I'll begin to reboot with old 3.4.0 kernel to see if things are > reproductible. > > Cheers, I'd say my problem is probably not related. Freshly rebooting all osd=20 nodes with 3.4.0 kernel (the same kernel I used this morning) now gives= =20 pool data stable & rbd unstable. As with current git, and the exact=20 opposite of results I had tuesday & this morning. Go figure. Could it have to do with previous usage in OSD ? or active mds ? or mon= ? As I already said, as my osd are using btrfs with big medata features,=20 so going back in 3.0 kernel need a complete reformat of my OSD before. But I will do it if you judge it can bring some light on this case. Cheers, --=20 Yann Dupont - Service IRTS, DSI Universit=E9 de Nantes Tel : 02.53.48.49.20 - Mail/Jabber : Yann.Dupont@univ-nantes.fr -- 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