From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: ceph-osd cpu usage Date: Thu, 15 Nov 2012 09:12:00 -0600 Message-ID: <50A50640.1040103@inktank.com> References: <7840e3d1-17b2-4618-ae1f-ff3dbdff71f6@mailpro> <50A4DDE8.8040506@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-pa0-f46.google.com ([209.85.220.46]:60482 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1768223Ab2KOPMC (ORCPT ); Thu, 15 Nov 2012 10:12:02 -0500 Received: by mail-pa0-f46.google.com with SMTP id hz1so1130258pad.19 for ; Thu, 15 Nov 2012 07:12:02 -0800 (PST) In-Reply-To: <50A4DDE8.8040506@profihost.ag> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Stefan Priebe - Profihost AG Cc: Alexandre DERUMIER , ceph-devel@vger.kernel.org Out of curiosity, does it help much if you disable crc32c calculations?= =20 Use the "nocrc" option in your ceph.conf file. I've had my eye on=20 crcutil as an alternative to how we do crc32c now. http://code.google.com/p/crcutil/ Mark On 11/15/2012 06:19 AM, Stefan Priebe - Profihost AG wrote: > Am 15.11.2012 12:18, schrieb Alexandre DERUMIER: >> cpu usage is same for read and write ? > > no for read it is just around 25%. And i get "full" (limited by rbd / > librbd) 23.000 iops per vm. > > >> ----- Mail original ----- >> >> De: "Stefan Priebe - Profihost AG" >> =C3=80: ceph-devel@vger.kernel.org >> Envoy=C3=A9: Jeudi 15 Novembre 2012 11:56:37 >> Objet: ceph-osd cpu usage >> >> Hello list, >> >> my main problem right now is that ceph does not scale for me (more v= ms >> using rbd). It does not scale as the ceph-osd is using all my CPU co= re >> all the time (8 cores) with just 4 SSDs. The SSDs are far away from >> being loaded. >> >> What is the best way to find out what the ceph-osd process is doing = all >> the time? >> >> A gperf graph is attached. >> >> Greets, >> Stefan >> > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel"= in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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