From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id C3DFB63002 for ; Tue, 14 Jul 2020 19:22:29 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id B2B0528C76 for ; Tue, 14 Jul 2020 19:21:59 +0200 (CEST) Received: from mout.web.de (mout.web.de [212.227.15.3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS id 8432728C69 for ; Tue, 14 Jul 2020 19:21:57 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=dbaedf251592; t=1594747317; bh=I1i3S8G4jFktX6KGKyfMRaGIDxLRf8xVTmo9DLwgMf4=; h=X-UI-Sender-Class:Subject:To:References:From:Date:In-Reply-To; b=FO2t9bNhHuHxaWcDVmThUeb622esM+/KjXrOt6soO2hVADWseCkNUGa3btdJ3uLjl 4ncNaro+fKqAxQCSTEv78Q7m/7KzqrF1gZv3hYbQbz1Smu5qGepaPME8PQzCfyMeRi p0b0WHyZqZ6m5wfkvjqCrp0M+0K1qbwPTRrkGegU= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Received: from Rolands-MacBook-Pro.cybercon.de ([5.147.253.138]) by smtp.web.de (mrweb001 [213.165.67.108]) with ESMTPSA (Nemesis) id 0LjJaZ-1kRQi211dX-00dUX4; Tue, 14 Jul 2020 19:16:37 +0200 To: Proxmox VE user list , Atila Vasconcelos References: <4900ba10-107e-439c-9716-6e988ae7f5ef@web.de> From: Roland Message-ID: <84b3b8ca-80f8-94d0-27c7-899743ac08e1@web.de> Date: Tue, 14 Jul 2020 19:16:40 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:M8bshXmWOP0NZvUM+1jbz7YNfYaNQB4KnpF+uOO289D6q/U82Q3 n6qB+C4kkOIae+UG67x6piCu6dEXj3VGtPJkelzG4saOwQc+3BRVgPgQ7Htbid+mp0Nbqlv tVFeH7OcIBTPWQLvmOjtT1ckM7JbwZMVKzyvA47GCQ8sYTpimw5J+wC9alkfcC4xo5sqInQ EAKqrx4wdcdm6SWGs+UgQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:XbdwqesctjI=:jP+8f1tG+LVYuSXn5kIHZL dS/aW8taJz2QW7y/ts0F8arbodExknitWTcsxik1xAU5qVt0i6doH57q42tzm9LlpuyVJhXak PHKic9c0+VN1hyjZla6glkYAhSWRuRqiGOD4C4VmKKt6mL1MUrDHrDp9P3Fw6eXoOKC74iper /1jhpTPcf0Irexc9BRHTKF6KvF/GRpqtLMJhAwN7z1ez6v0XR3+K7QKWGnDW629zcHvmYoZ/E gDqOzUIDXBlFQz5M35FpT+Qj43+xdfhWKznT1lvdoe8rYT3KeaLrZIV9ghO2fTs8OFiDBBLm1 o2K5BY10BarSNTlBqJ37iffR8C4mHCYBOrInxYHj1QeilBQP5D31lv4ffP9b+RKctZTqtI/17 RHs9kRRF5gM6m5WAFQPTG5/C5xau5UbwxVRvDacRioGJplsuUVJMsRvvmn231htdl4/rrheei m1L+M+ik74kIL2wqGbyFWLh2Y7bRzqdYrQXHfVazZs6T6jhVd4NA3XgwekgVhBRb+CA8wIh/f 1ddU9V7oFfF95cr7L//J4r+AbkobgBIAnum9+FNcHt96Pe3Nv5VY3/NGYYC/P7Ee0UGKn3k1u j9ZB6p9+LrzZuJx2RESeZTXAJuvcL2vVshmRvnyDVTWA14lCTGqcLEGzmK6anTxyUtzK47FPO 5UIns9fyLYuCqcXH+W9b+IHnK27Llnypc19yTuUpfneSQlZ4/8xfWfse1rkKo0NegM+na7quF b5G3rwLWGspXdTisQEuVCiMvKlvLPJ/GB0TQFSEuEiJnC1h7v0gtcYLNpc9a8l4BP03k/LJgq fjRqAq7/lgH5tWskUdY7rImCF+5CzwyYevphn016zlEwuQgL4nHLjuRFwMQG5wk8npmM6f0E2 eFjV7G1ELk2UGmdAO1UJhpSUvnj51YIveRY7Mr9lyi9kz0YM6eDjGxpMEmPxiXys9T7P5zsCt VgJKGZc/WP7MeygSe6tE3S2EJ0KJN61zskRVv7Z5noSiq53qfLDBA1Hkt5cZQdWKCTL0CFZGa 3Wof2HZs2IOoNhmireyLRShsu6geqoT9YNLfHHQasa6WQARqV0BRH50KaAN4Z4Z+TqxAx3aqF SvF/rgGmtb9ybu/JG+tRejkAsnNpS+0vo8I0abEkqL/Ke7r4BTi2SiWT2+upNyx+ygBgDiJOK rmTCG8SHHr2RBItGE0W7y0ooRW3VwWYxTu1SXGO0cOjOIC9Z6Dxph/7ApGBmz2B6cIhQVSciJ G0/Gi6U86vhU2l+iq X-SPAM-LEVEL: Spam detection results: 0 AWL -0.400 Adjusted score from AWL reputation of From: address DKIM_SIGNED 0.1 Message has a DKIM or DK signature, not necessarily valid DKIM_VALID -0.1 Message has at least one valid DKIM or DK signature DKIM_VALID_AU -0.1 Message has a valid DKIM or DK signature from author's domain DKIM_VALID_EF -0.1 Message has a valid DKIM or DK signature from envelope-from domain FREEMAIL_FROM 0.001 Sender email is commonly abused enduser mail provider KAM_ASCII_DIVIDERS 0.8 Spam that uses ascii formatting tricks NICE_REPLY_A -0.001 Looks like a legit reply (A) RCVD_IN_DNSWL_LOW -0.7 Sender listed at https://www.dnswl.org/, low trust RCVD_IN_MSPIKE_H3 0.001 Good reputation (+3) RCVD_IN_MSPIKE_WL 0.001 Mailspike good senders SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record URIBL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [proxmox.com, gnu.org] Subject: Re: [PVE-User] linux idle cpu overhead in kvm - old issue, but still there in 2020... X-BeenThere: pve-user@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE user list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Jul 2020 17:22:29 -0000 nice :) what guest OS do you use and which showed the problem ? as i think that q35 will not be default in kvm or proxmox anytime soon, shouldn't we perhaps file a bug report for every distro affected ? is there someone who likes to work with this (help testing, writing/tracking bug reports...) ? could perhaps save some tons of CO2 .... roland Am 14.07.20 um 18:05 schrieb Atila Vasconcelos: > Wow, I just tried this at my servers (very old Dell PowerEdge 2950); > > The results are impressive! > > 8o > > > ABV > > > On 2020-07-13 3:15 a.m., Roland wrote: >> hello, >> >> i have found that there is an old bug still around in linux, which is >> causing quite an amount of unnecessary cpu consumption in kvm/proxmox, >> and thus, wasting precious power. >> >> i run some proxmox installations on older systems and on those, it's >> quite significant difference. >> >> on the slowest system, a single debian 10 VM , kvm process is at 20% cp= u >> (VM is 100% idle) when this issue is present. >> >> if i change VMs machine type from i440fx(default) to q35 the problem >> goes away. >> >> the same applies when running "powertop --auto-tune" inside the guest >> (with i440fx type - enable autosuspend for usb-controller + tablet >> device). >> >> on some L5630 machine, in proxmox summary i see "CPU usage" drop from >> 10% to <1%. >> >> see: >> https://bugzilla.redhat.com/show_bug.cgi?id=3D478317 >> https://bugzilla.redhat.com/show_bug.cgi?id=3D949547 >> >> i guess this information could make a difference for people who run a >> large amount of virtual machines or use older systems/cpu's. >> >> on most recent cpu's, i think the difference is not that big. >> >> anyway, i really wonder how linux bugs have such great survival >> capability.... >> >> regards >> roland >> >> more references: >> https://lists.gnu.org/archive/html/qemu-devel/2010-04/msg00149.html >> https://www.redhat.com/archives/vfio-users/2015-November/msg00159.html >> >> >> _______________________________________________ >> pve-user mailing list >> pve-user@lists.proxmox.com >> https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user >> > > _______________________________________________ > pve-user mailing list > pve-user@lists.proxmox.com > https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user >