From nobody Wed Jul 21 12:06:07 2021 X-Original-To: freebsd-stable@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id DE5AB127CCB4 for ; Wed, 21 Jul 2021 12:06:11 +0000 (UTC) (envelope-from SRS0=OSCD=MN=quip.cz=000.fbsd@elsa.codelab.cz) Received: from elsa.codelab.cz (elsa.codelab.cz [94.124.105.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4GVDnb575Nz3qyD for ; Wed, 21 Jul 2021 12:06:11 +0000 (UTC) (envelope-from SRS0=OSCD=MN=quip.cz=000.fbsd@elsa.codelab.cz) Received: from elsa.codelab.cz (localhost [127.0.0.1]) by elsa.codelab.cz (Postfix) with ESMTP id BC17D2842B; Wed, 21 Jul 2021 14:06:09 +0200 (CEST) Received: from illbsd.quip.test (ip-94-113-69-69.net.upcbroadband.cz [94.113.69.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by elsa.codelab.cz (Postfix) with ESMTPSA id BAFE328416; Wed, 21 Jul 2021 14:06:08 +0200 (CEST) Subject: Re: CPU hot-plug and RAM hot-add in virtual machines To: Rainer Duffner Cc: FreeBSD Stable Mailing List References: <4336a1bf-d826-dba3-9ec1-9b48cf7cd177@quip.cz> <70033628-bc3a-24d2-4c65-9a3b9c1c66d5@FreeBSD.org> From: Miroslav Lachman <000.fbsd@quip.cz> Message-ID: Date: Wed, 21 Jul 2021 14:06:07 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 List-Id: Production branch of FreeBSD source code List-Archive: https://lists.freebsd.org/archives/freebsd-stable List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-stable@freebsd.org X-BeenThere: freebsd-stable@freebsd.org MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4GVDnb575Nz3qyD X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-ThisMailContainsUnwantedMimeParts: N On 21/07/2021 11:58, Rainer Duffner wrote: > My guess is that it’s something that is very much tied to the Linux kernel. > > AFAIK, it works on RHEL (and derivatives), and that’s usually a sign that it’s 100% tied to the Linux-kernel. > > > We have over 20 Vcenters (yeah...) with thousands of VMs and AFAIK, only one customer has ever requested that feature. > > Do you really need it that badly? Thank you for the insights. I don't need that badly but it is another problem our customers have with FreeBSD over Linux. One of them has about 50 VM, mostly Linux, some Windows and 8 FreeBSD. I maintain the FreeBSD VMs. They need to add RAM and CPU often because of the growth of their projects and as they do not like maintenance downtimes they are happy with hot add and hot plug on Linux VMs and were kind of disappointed that FreeBSD does not support it. No body will leave FreeBSD just because of that but when somebody counts problems with this, with ElasticSearch, some NPM / Yarn packages, popularity of Docker and so on, then they ask "Why not migrate all to Linux?". Kind regards Miroslav Lachman