From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <ukrishn@linux.vnet.ibm.com>
Received: from e38.co.us.ibm.com (e38.co.us.ibm.com [32.97.110.159])
 (using TLSv1.2 with cipher CAMELLIA256-SHA (256/256 bits))
 (No client certificate requested)
 by lists.ozlabs.org (Postfix) with ESMTPS id 039A91A0D02
 for <linuxppc-dev@lists.ozlabs.org>; Wed,  9 Mar 2016 04:56:46 +1100 (AEDT)
Received: from localhost
 by e38.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only!
 Violators will be prosecuted
 for <linuxppc-dev@lists.ozlabs.org> from <ukrishn@linux.vnet.ibm.com>;
 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 BECF519D803E
 for <linuxppc-dev@lists.ozlabs.org>; Tue,  8 Mar 2016 10:44:37 -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
 u28HugYu37814310
 for <linuxppc-dev@lists.ozlabs.org>; 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
 u28HufHg027851
 for <linuxppc-dev@lists.ozlabs.org>; Tue, 8 Mar 2016 10:56:42 -0700
Subject: Re: [PATCH 7/7] cxlflash: Increase cmd_per_lun for better throughput
To: linux-scsi@vger.kernel.org,
 James Bottomley <James.Bottomley@HansenPartnership.com>,
 "Martin K. Petersen" <martin.petersen@oracle.com>,
 "Matthew R. Ochs" <mrochs@linux.vnet.ibm.com>,
 "Manoj N. Kumar" <manoj@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>
Cc: linuxppc-dev@lists.ozlabs.org, Brian King <brking@linux.vnet.ibm.com>,
 Ian Munsie <imunsie@au1.ibm.com>,
 Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
 Frederic Barrat <fbarrat@linux.vnet.ibm.com>,
 Christophe Lombard <clombard@linux.vnet.ibm.com>
From: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Message-ID: <56DF125A.8000202@linux.vnet.ibm.com>
Date: Tue, 8 Mar 2016 11:56:42 -0600
MIME-Version: 1.0
In-Reply-To: <1457128520-53056-7-git-send-email-ukrishn@linux.vnet.ibm.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>

On 3/4/2016 3:55 PM, Uma Krishnan wrote:
> From: "Manoj N. Kumar" <manoj@linux.vnet.ibm.com>
>
> 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 <manoj@linux.vnet.ibm.com>

Reviewed-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>