From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: poor OSD performance using kernel 3.4 Date: Wed, 30 May 2012 15:54:35 +0200 Message-ID: <4FC6269B.20401@profihost.ag> 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> <4FC61E69.2030408@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from mail.profihost.ag ([85.158.179.208]:38482 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754633Ab2E3Nyd (ORCPT ); Wed, 30 May 2012 09:54:33 -0400 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Stefan Majer Cc: Mark Nelson , "ceph-devel@vger.kernel.org" Am 30.05.2012 15:38, schrieb Stefan Majer: > There is a small howto from linus: > http://kerneltrap.org/node/11753 > > you basically need to be able to compile the kernel from source and > start in the freshly checked out source > git bisect good v3.0 > git bisect bad v3.2 > > Then git will pick a version inbetween an you can compile this, depoy it > to your machine an look if it good or bad. > Then tell git if it was bad or good and git will again choose a version > between both versions. So you will get a single commit or a handful of > commits which are probably the cause of the problem. Thanks will try that after mark has looked into the blktrace ;-) Thanks, Stefan