From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: krbd blk-mq support ? Date: Mon, 27 Oct 2014 02:45:56 -0700 Message-ID: <20141027094556.GA31604@infradead.org> References: <8dd75b6c-f026-466d-baa4-fa4d11f8800a@mailpro> <42753caf-adc1-48f7-bc34-83ed48845061@mailpro> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from bombadil.infradead.org ([198.137.202.9]:60669 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751988AbaJ0Jp5 (ORCPT ); Mon, 27 Oct 2014 05:45:57 -0400 Content-Disposition: inline In-Reply-To: <42753caf-adc1-48f7-bc34-83ed48845061@mailpro> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Alexandre DERUMIER Cc: Christoph Hellwig , Ceph Devel On Sun, Oct 26, 2014 at 02:46:03PM +0100, Alexandre DERUMIER wrote: > Hi, > > some news: > > I have applied patches succefully on top of 3.18-rc1 kernel. > > But don't seem to help is my case. > (I think that blk-mq is working because I don't see any io schedulers on rbd devices, as blk-mq don't support them actually). > > My main problem is that I can't reach more than around 50000iops on 1 machine, > > and the problem seem to be the kworker process stuck at 100% of 1core. Can you do a perf report -ag and then a perf report to see where these cycles are spent?