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=-8.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 372FEC2D0A3 for ; Fri, 6 Nov 2020 18:12:53 +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 0F731205CA for ; Fri, 6 Nov 2020 18:12:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="R6ufOMYV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0F731205CA 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]:42814 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kb6EF-0008MR-0G for qemu-devel@archiver.kernel.org; Fri, 06 Nov 2020 13:12:51 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51214) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kb6DZ-0007us-GS for qemu-devel@nongnu.org; Fri, 06 Nov 2020 13:12:09 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:22437) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kb6DX-000362-4W for qemu-devel@nongnu.org; Fri, 06 Nov 2020 13:12:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1604686324; 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: in-reply-to:in-reply-to:references:references; bh=br2En5SgEYBPfiEmfeuWV+6096Upc+HED/wX69lPF/w=; b=R6ufOMYVE2lG76Gr1eHX12wGF0OWvRh8pwL0MKjOq6S+pt7xnz1m/m1TYyztDCOHa6dmWu IrB+uyW8KcIoVM0bfeFiWr0eo6P7VbMh/A3+JIVUoU8IuRHAtuFpzL22yL+qfssCpZ8Dqf +5t5XZC6ciOCu1jN85bUJojjVTv1EOE= 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-584-0TIZMCoLO-uSahfMbq6T4A-1; Fri, 06 Nov 2020 13:12:03 -0500 X-MC-Unique: 0TIZMCoLO-uSahfMbq6T4A-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5C6158030C8; Fri, 6 Nov 2020 18:12:02 +0000 (UTC) Received: from work-vm (ovpn-114-220.ams2.redhat.com [10.36.114.220]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7377375121; Fri, 6 Nov 2020 18:11:58 +0000 (UTC) Date: Fri, 6 Nov 2020 18:11:55 +0000 From: "Dr. David Alan Gilbert" To: Fotis Xenakis Subject: Re: [Virtio-fs] [qemu-web PATCH v2] Add virtio-fs in OSv overview blog post Message-ID: <20201106181155.GR3576@work-vm> References: MIME-Version: 1.0 In-Reply-To: User-Agent: Mutt/1.14.6 (2020-07-11) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=63.128.21.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/06 06:30:30 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=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: virtio-fs@redhat.com, thuth@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Fotis Xenakis (foxen@windowslive.com) wrote: > This post briefly goes over the main points of virtio-fs and OSv, a > unikernel running under QEMU/KVM and taking advantage of its virtio-fs > implementation. > > Changes since v1: > - Fixed wording and links, as suggested by Thomas Huth. > - Added a short example of virtio-fs usage in OSv. > > Signed-off-by: Fotis Xenakis > +One central point is OSv's support for booting from virtio-fs: this enables > +deploying a modified version or a whole new application **without rebuilding** > +the image, just by adjusting its root file system contents on the host. Last, > +owing to the DAX window practically providing low-overhead access to the host's > +page cache, scalability is also expected to excel, with it being a common > +concern due to the potentially high density of unikernels per host. Hi Fotis, Since I'm not used to unikernels, I'm a little confused by this; I'd appreciate some explanation. In your unikernel, does the root filesystem just contain data? I mean being a 'unikernel' aren't all the binaries and support all linked into the kernel itself? Dave -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK