From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: less cores more iops / speed Date: Thu, 08 Nov 2012 10:02:23 +0100 Message-ID: <509B751F.8000900@profihost.ag> References: <97ae038a-a5ae-4df4-acf6-c87cb80020aa@mailpro> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail.profihost.ag ([85.158.179.208]:41964 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753421Ab2KHJCb (ORCPT ); Thu, 8 Nov 2012 04:02:31 -0500 In-Reply-To: <97ae038a-a5ae-4df4-acf6-c87cb80020aa@mailpro> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Alexandre DERUMIER Cc: Joao Eduardo Luis , ceph-devel@vger.kernel.org, Mark Nelson Am 08.11.2012 09:58, schrieb Alexandre DERUMIER: >>> What do you mean by that? I'm talking about the KVM guest not about= the >>> ceph nodes. > > Do you have tried to compare virtio-blk and virtio-scsi ? How to change? Right now i'm using the PVE defaults =3D> scsi-hd. > Do you have tried directly from the host with the rbd kernel module ? No don't know how to use ;-) Stefan > ----- Mail original ----- > > De: "Stefan Priebe - Profihost AG" > =C3=80: "Mark Nelson" > Cc: "Joao Eduardo Luis" , ceph-devel@vger.kern= el.org > Envoy=C3=A9: Jeudi 8 Novembre 2012 09:45:17 > Objet: Re: less cores more iops / speed > > Am 08.11.2012 01:59, schrieb Mark Nelson: >> There's also the context switching overhead. It'd be interesting to >> know how much the writer processes were shifting around on cores. > What do you mean by that? I'm talking about the KVM guest not about t= he > ceph nodes. > >> Stefan, what tool were you using to do writes? > as always: fio ;-) > > Stefan > -- 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