From mboxrd@z Thu Jan 1 00:00:00 1970 From: Uma Krishnan Subject: Re: [PATCH 7/7] cxlflash: Increase cmd_per_lun for better throughput Date: Tue, 8 Mar 2016 11:56:42 -0600 Message-ID: <56DF125A.8000202@linux.vnet.ibm.com> References: <1457128424-53017-1-git-send-email-ukrishn@linux.vnet.ibm.com> <1457128520-53056-1-git-send-email-ukrishn@linux.vnet.ibm.com> <1457128520-53056-7-git-send-email-ukrishn@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from e38.co.us.ibm.com ([32.97.110.159]:56400 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751170AbcCHR4q (ORCPT ); Tue, 8 Mar 2016 12:56:46 -0500 Received: from localhost by e38.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 8 Mar 2016 10:56:45 -0700 Received: from b03cxnp08028.gho.boulder.ibm.com (b03cxnp08028.gho.boulder.ibm.com [9.17.130.20]) by d03dlp03.boulder.ibm.com (Postfix) with ESMTP id 255E919D8051 for ; Tue, 8 Mar 2016 10:44:38 -0700 (MST) Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u28Hug5538731966 for ; Tue, 8 Mar 2016 10:56:42 -0700 Received: from d03av01.boulder.ibm.com (localhost [127.0.0.1]) by d03av01.boulder.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u28HufHk027851 for ; Tue, 8 Mar 2016 10:56:42 -0700 In-Reply-To: <1457128520-53056-7-git-send-email-ukrishn@linux.vnet.ibm.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org, James Bottomley , "Martin K. Petersen" , "Matthew R. Ochs" , "Manoj N. Kumar" Cc: linuxppc-dev@lists.ozlabs.org, Brian King , Ian Munsie , Andrew Donnellan , Frederic Barrat , Christophe Lombard On 3/4/2016 3:55 PM, Uma Krishnan wrote: > From: "Manoj N. Kumar" > > With the current value of cmd_per_lun at 16, the throughput > over a single adapter is limited to around 150kIOPS. > > Increase the value of cmd_per_lun to 256 to improve > throughput. With this change a single adapter is able to > attain close to the maximum throughput (380kIOPS). > Also change the number of RRQ entries that can be queued. > > Signed-off-by: Manoj N. Kumar Reviewed-by: Uma Krishnan