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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 78013C32789 for ; Fri, 2 Nov 2018 18:26:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4FB2F2082E for ; Fri, 2 Nov 2018 18:26:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4FB2F2082E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728288AbeKCDeJ (ORCPT ); Fri, 2 Nov 2018 23:34:09 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35339 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728033AbeKCDeI (ORCPT ); Fri, 2 Nov 2018 23:34:08 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 46FFD3C2CC7; Fri, 2 Nov 2018 18:26:01 +0000 (UTC) Received: from redhat.com (ovpn-124-238.rdu2.redhat.com [10.10.124.238]) by smtp.corp.redhat.com (Postfix) with SMTP id 86D4B60BF1; Fri, 2 Nov 2018 18:26:00 +0000 (UTC) Date: Fri, 2 Nov 2018 14:26:00 -0400 From: "Michael S. Tsirkin" To: Vitaly Mayatskikh Cc: Jason Wang , Paolo Bonzini , kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/1] vhost: add vhost_blk driver Message-ID: <20181102142446-mutt-send-email-mst@kernel.org> References: <20181102182123.29420-1-v.mayatskih@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181102182123.29420-1-v.mayatskih@gmail.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Fri, 02 Nov 2018 18:26:01 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 02, 2018 at 06:21:22PM +0000, Vitaly Mayatskikh wrote: > vhost_blk is a host-side kernel mode accelerator for virtio-blk. The > driver allows VM to reach a near bare-metal disk performance. See IOPS > numbers below (fio --rw=randread --bs=4k). > > This implementation uses kiocb interface. It is slightly slower than > going directly through bio, but is simpler and also works with disk > images placed on a file system. > > # fio num-jobs > # A: bare metal over block > # B: bare metal over file > # C: virtio-blk over block > # D: virtio-blk over file > # E: vhost-blk bio over block > # F: vhost-blk kiocb over block > # G: vhost-blk kiocb over file > # > # A B C D E F G > > 1 171k 151k 148k 151k 195k 187k 175k > 2 328k 302k 249k 241k 349k 334k 296k > 3 479k 437k 179k 174k 501k 464k 404k > 4 622k 568k 143k 183k 620k 580k 492k > 5 755k 697k 136k 128k 737k 693k 579k > 6 887k 808k 131k 120k 830k 782k 640k > 7 1004k 926k 126k 131k 926k 863k 693k > 8 1099k 1015k 117k 115k 1001k 931k 712k > 9 1194k 1119k 115k 111k 1055k 991k 711k > 10 1278k 1207k 109k 114k 1130k 1046k 695k > 11 1345k 1280k 110k 108k 1119k 1091k 663k > 12 1411k 1356k 104k 106k 1201k 1142k 629k > 13 1466k 1423k 106k 106k 1260k 1170k 607k > 14 1517k 1486k 103k 106k 1296k 1179k 589k > 15 1552k 1543k 102k 102k 1322k 1191k 571k > 16 1480k 1506k 101k 102k 1346k 1202k 566k > > Vitaly Mayatskikh (1): > Add vhost_blk driver Thanks! Before merging this, I'd like to get some acks from userspace that it's actually going to be used - e.g. QEMU block maintainers. > drivers/vhost/Kconfig | 13 ++ > drivers/vhost/Makefile | 3 + > drivers/vhost/blk.c | 510 +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 526 insertions(+) > create mode 100644 drivers/vhost/blk.c > > -- > 2.17.1