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=-15.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 61D43C433DB for ; Thu, 21 Jan 2021 11:48:34 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B0F262395A for ; Thu, 21 Jan 2021 11:48:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B0F262395A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:57802 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l2YS0-0007PI-Fi for qemu-devel@archiver.kernel.org; Thu, 21 Jan 2021 06:48:32 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:56878) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l2YQv-0006y5-3a for qemu-devel@nongnu.org; Thu, 21 Jan 2021 06:47:25 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:45313) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1l2YQs-0000By-TU for qemu-devel@nongnu.org; Thu, 21 Jan 2021 06:47:24 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611229640; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oJ6EIYUUjxpkQOHztNfaTlQ0w54cM/OP+TCE/3cSv8o=; b=A7EABteftffF2HGY9W36mO5ACpBHSdvkzRYsgL90OKsXwuljx/YeBDluK3Dde9uuvVBzrb k9CFvlR67NtMoETmZeNoIXTIh4bFXCJjwwgZoL8ezhuiqRGwbwd+Q34zySBs4cnkKXUUyn bSAkSjqlVNe1Ku66mHf5L5YQfgOcpYk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-515-wRK7rkXzPku_VA90BJEuww-1; Thu, 21 Jan 2021 06:47:17 -0500 X-MC-Unique: wRK7rkXzPku_VA90BJEuww-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id F19D2107ACF8 for ; Thu, 21 Jan 2021 11:47:16 +0000 (UTC) Received: from thuth.remote.csb (ovpn-112-82.ams2.redhat.com [10.36.112.82]) by smtp.corp.redhat.com (Postfix) with ESMTP id 82B5E60CE7; Thu, 21 Jan 2021 11:47:09 +0000 (UTC) Subject: Re: [qemu-web PATCH v3] Add virtio-blk and virtio-scsi configuration post To: Stefan Hajnoczi , qemu-devel@nongnu.org References: <20210119141511.288131-1-stefanha@redhat.com> From: Thomas Huth Message-ID: Date: Thu, 21 Jan 2021 12:47:08 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <20210119141511.288131-1-stefanha@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.168, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , =?UTF-8?Q?Daniel_P_=2e_Berrang=c3=a9?= , slp@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 19/01/2021 15.15, Stefan Hajnoczi wrote: > The second post in the storage series covers virtio-blk and virtio-scsi. > It compares the two and offers recommendations that users and tools > using QEMU can use as a starting point. Graphs are included comparing > the performance of various options. > > Signed-off-by: Stefan Hajnoczi > --- > v3: > * Mention guest drivers for other operation systems [Thomas] > * Reorder virtio-blk/virtio-scsi key points [Thomas] > * Mention that virtio-blk is limited to disk emulation and doesn't > handle CD-ROM drivers, for example [Thomas] > v2: > * Mention default storage controllers for non-x86 [danpb] > * Remove statement about read-only ISO virtio-blk devices, both Rich > Jones and Daniel Berrange commented about this at different times so > I decided to drop it completely [danpb] > * Clarify PCI slot limits and multi-function discussion for virtio-blk > [danpb] > * Mention multiple virtio-scsi devices for NUMA tuning and that > emulated LUNs can be HDDs or CD-ROMs [danpb] > --- > ...021-01-19-virtio-blk-scsi-configuration.md | 117 ++++++++++++++++++ > screenshots/2020-09-15-scsi-devices.svg | 1 + > screenshots/2020-09-15-virtio-blk-vs-scsi.svg | 1 + > 3 files changed, 119 insertions(+) > create mode 100644 _posts/2021-01-19-virtio-blk-scsi-configuration.md > create mode 100644 screenshots/2020-09-15-scsi-devices.svg > create mode 100644 screenshots/2020-09-15-virtio-blk-vs-scsi.svg > > diff --git a/_posts/2021-01-19-virtio-blk-scsi-configuration.md b/_posts/2021-01-19-virtio-blk-scsi-configuration.md > new file mode 100644 > index 0000000..a9c7a35 > --- /dev/null > +++ b/_posts/2021-01-19-virtio-blk-scsi-configuration.md > @@ -0,0 +1,117 @@ [...] > +Virtual machines that require access to many disks can hit limits based on > +availability of PCI slots, which are under contention with other devices > +exposed to the guest, such as NICs. For example a typical i440fx machine type > +default configuration allows for about 28 disks. It is possible to use > +multi-function devices to pack multiple virtio-blk devies into a single PCI Thanks! I've replaced "devies" with "devices" and pushed it to the repo now. Thomas