From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752620AbdJMQpk (ORCPT ); Fri, 13 Oct 2017 12:45:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58196 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751057AbdJMQph (ORCPT ); Fri, 13 Oct 2017 12:45:37 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 612A65F298C Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=ming.lei@redhat.com Date: Sat, 14 Oct 2017 00:45:20 +0800 From: Ming Lei To: Bart Van Assche Cc: "axboe@kernel.dk" , "linux-kernel@vger.kernel.org" , "linux-block@vger.kernel.org" , "hch@infradead.org" , "tom81094@gmail.com" , "paolo.valente@linaro.org" , "linux-scsi@vger.kernel.org" , "oleksandr@natalenko.name" , "john.garry@huawei.com" , "osandov@fb.com" , "loberman@redhat.com" Subject: Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops Message-ID: <20171013164519.GF30899@ming.t460p> References: <20171012183704.22326-1-ming.lei@redhat.com> <20171012183704.22326-5-ming.lei@redhat.com> <9a741c03-90a3-e583-ddde-0ed71c8570a2@kernel.dk> <20171013001919.GA24715@ming.t460p> <6efdb459-8746-562d-06dc-5b3e172076e1@kernel.dk> <20171013160731.GA30899@ming.t460p> <1507912260.13345.0.camel@wdc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1507912260.13345.0.camel@wdc.com> User-Agent: Mutt/1.8.3 (2017-05-23) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Fri, 13 Oct 2017 16:45:37 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 13, 2017 at 04:31:04PM +0000, Bart Van Assche wrote: > On Sat, 2017-10-14 at 00:07 +0800, Ming Lei wrote: > > Actually it is in hot path, for example, lpfc and qla2xx's queue depth is 3, > > Sorry but I doubt whether that is correct. More in general, I don't know any modern > storage HBA for which the default queue depth is so low. You can grep: [ming@ming linux]$ git grep -n cmd_per_lun ./drivers/scsi/ | grep -E "qla2xxx|lpfc" Even SRP/IB isn't big too, just 32. -- Ming