From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933270AbaCQNbg (ORCPT ); Mon, 17 Mar 2014 09:31:36 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:51772 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933122AbaCQNbb (ORCPT ); Mon, 17 Mar 2014 09:31:31 -0400 Message-Id: <20140317132733.789623766@bombadil.infradead.org> User-Agent: quilt/0.60-1 Date: Mon, 17 Mar 2014 06:27:33 -0700 From: Christoph Hellwig To: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 00/39] [WIP] scsi multiqueue X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I'd like to repost the current state of the scsi multiqueue work. This version has shown stable under various loads and is getting close to feature complete. So far we see it improving the IOPS over the old code up to 30% and maxing out the current test hardware, so we will have to test on bigger hardware for more numbers. More impressive is the CPU usage reduction of over 200% on multi-lun tests where we can now mostly avoid the host lock contention. The big remaining TODO item is to look into the queue limit and tag allocation in blk-mq to make it work for all existing SCSI drivers. Feel free to test it with the existing drivers that set use_blk_mq as well as with any other driver that doesn't use scsi_init_shared_tag_map.