From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Kirkwood Subject: Re: RBD performance - tuning hints / major slowdown effect(s) Date: Fri, 31 Aug 2012 22:16:26 +1200 Message-ID: <50408EFA.3000403@catalyst.net.nz> References: <503F91EF.7020807@inktank.com> <1ab6cbb8-de0c-4d24-953b-98eced2f4ae2@mailpro> <24E144B8C0207547AD09C467A8259F755760304F@lisa.maurer-it.com> <50407A62.1020208@catalyst.net.nz> <20120831094926.GA30653@oder.kd-bie.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from bertrand.catalyst.net.nz ([202.78.240.40]:58132 "EHLO mail.catalyst.net.nz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752005Ab2HaKRe (ORCPT ); Fri, 31 Aug 2012 06:17:34 -0400 In-Reply-To: <20120831094926.GA30653@oder.kd-bie.de> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Dieter Kasper Cc: Dietmar Maurer , Alexandre DERUMIER , Josh Durgin , "ceph-devel@vger.kernel.org" , Andreas Bluemle Sorry Dieter, Not trying to say "you are wrong" or anything like that - just trying to add to the problem solving body of knowledge that from what *I* have tried out the 'sync' issue does not look to be the bad guy here - altho more analysis is always welcome (usual story - my findings should be confirm-able by others doing similar tests)! regards Mark On 31/08/12 21:49, Dieter Kasper wrote: > Mark, Inktank, > > OK, it is very likely that 'sync_file_range' is not the major slowdown 'culprit'. > > But, which areas (design, current implementation, protocol, interconnect, tuning parameter, ...) > would you rate as 'major slowdown effect(s)' ? >