From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14509C33CAF for ; Thu, 16 Jan 2020 04:03:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D5D0A207E0 for ; Thu, 16 Jan 2020 04:03:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="GZ1CfkcM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729955AbgAPEDS (ORCPT ); Wed, 15 Jan 2020 23:03:18 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:59698 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729110AbgAPEDS (ORCPT ); Wed, 15 Jan 2020 23:03:18 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id 00G3wVZe147170; Thu, 16 Jan 2020 04:03:11 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : references : date : in-reply-to : message-id : mime-version : content-type; s=corp-2019-08-05; bh=ritGAYdlcr1yW4YZVj4cu6XlER7GE4xIl+CF3Nw2WWk=; b=GZ1CfkcM19XUKLcPxWsrjHkfjyJy0g4tGmueSsrE8QfalOQD0M6KKcYmqpltx2KFScu/ ermWZpXIzj2yCwLBMsFOPO1o9+1YhfElns5ZeFlNKzfg3Z070w/uEapt1ccsLP0Ysdhe uMgSuEWP4Ftj1R1NFcn2s8PpTSrgCLAomejAmsXkvzvM2bmuIdp1NPTXzGGZQFwi7tkz kbKRncD70Q+gxNDdzPtSDSIl30l59YX6gpajQffYscFNE3acSyNVjYlwhwkoc8NWbdOM 0OByHXDQTqTz/J/BZlj4XmWVVj4iRbgDAlaNr0IrkByRX9JaFtiz0AudRANSiyE1xPa0 +Q== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 2xf74sg1jt-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 16 Jan 2020 04:03:11 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id 00G3xI9c167700; Thu, 16 Jan 2020 04:03:11 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3030.oracle.com with ESMTP id 2xhy22j86k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 16 Jan 2020 04:03:11 +0000 Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 00G4399q032433; Thu, 16 Jan 2020 04:03:09 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 15 Jan 2020 20:03:08 -0800 To: longli@linuxonhyperv.com Cc: "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Sasha Levin , "James E.J. Bottomley" , "Martin K. Petersen" , linux-hyperv@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Long Li Subject: Re: [Patch v2] scsi: storvsc: Correctly set number of hardware queues for IDE disk From: "Martin K. Petersen" Organization: Oracle Corporation References: <1578960516-108228-1-git-send-email-longli@linuxonhyperv.com> Date: Wed, 15 Jan 2020 23:03:05 -0500 In-Reply-To: <1578960516-108228-1-git-send-email-longli@linuxonhyperv.com> (longli@linuxonhyperv.com's message of "Mon, 13 Jan 2020 16:08:36 -0800") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9501 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001160031 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9501 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001160031 Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org Long, > Commit 0ed881027690 ("scsi: storvsc: setup 1:1 mapping between > hardware queue and CPU queue") introduced a regression for disks > attached to IDE. For these disks the host VSP only offers one VMBUS > channel. Setting multiple queues can overload the VMBUS channel and > result in performance drop for high queue depth workload on system > with large number of CPUs. Applied to 5.5/scsi-fixes, thanks! -- Martin K. Petersen Oracle Linux Engineering