From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johannes Thumshirn Subject: Re: [dm-devel] [RFC PATCH 0/4] dm mpath: vastly improve blk-mq IO performance Date: Wed, 13 Apr 2016 09:03:06 +0200 Message-ID: <1894861.yMOs7f7bAi@c203> References: <1459454666-76428-1-git-send-email-snitzer@redhat.com> <2760420.6GyDefUaH5@c203> <20160408192938.GC8453@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mx2.suse.de ([195.135.220.15]:55412 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933665AbcDMHDK convert rfc822-to-8bit (ORCPT ); Wed, 13 Apr 2016 03:03:10 -0400 In-Reply-To: <20160408192938.GC8453@redhat.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: dm-devel@redhat.com Cc: Mike Snitzer , linux-scsi@vger.kernel.org, sagig@dev.mellanox.co.il, jmoyer@redhat.com, linux-block@vger.kernel.org, j-nomura@ce.jp.nec.com On Freitag, 8. April 2016 15:29:39 CEST Mike Snitzer wrote: > On Fri, Apr 08 2016 at 7:42am -0400, > Johannes Thumshirn wrote: >=20 > > Ladies and Gentlemen, > > To show off some numbers from our testing: > >=20 > > All tests are performed against the cache of the Array, not the dis= ks as we=20 > > wanted to test the Linux stack not the Disk Array. > >=20 > > All single queue tests have been performed with the deadline I/O Sc= heduler. > >=20 > > Comments welcome, have fun reading :-) >=20 > Any chance you collected performance results from DM MQ on this same > testbed without any variant of my lockless patches? The DM SQ result= s > aren't too interesting a reference point. Seeing how much better > lockless DM MQ (multipath) is than the old m->lock heacy code (still = in > 4.6) would be more interesting. >=20 > Not a big deal if you don't have it.. but figured I'd check to see. I'll have to look if there are some of the old logfiles still available= , but we can't re-test, as the array was just temporarily allocated to us and we= 've now lost access to it. But IIRC it's been somewhere around 300K IOPS, b= ut=20 don't quote me on that. Byte, Joahnnes =20 > And thanks for the numbers you've provided. > Mike >=20 > -- > dm-devel mailing list > dm-devel@redhat.com > https://www.redhat.com/mailman/listinfo/dm-devel >=20 --=20 Johannes Thumshirn = Storage jthumshirn@suse.de = +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: Felix Imend=F6rffer, Jane Smithard, Graham Norton HRB 21284 (AG N=FCrnberg) Key fingerprint =3D EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html