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=-7.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 4C120C433DB for ; Wed, 17 Mar 2021 16:51:20 +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 B0C2C64F41 for ; Wed, 17 Mar 2021 16:51:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B0C2C64F41 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]:41366 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lMZO8-0000WX-HQ for qemu-devel@archiver.kernel.org; Wed, 17 Mar 2021 12:51:16 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60668) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lMYt2-0006J5-1w for qemu-devel@nongnu.org; Wed, 17 Mar 2021 12:19:08 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:46656) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1lMYsw-0007E3-Jt for qemu-devel@nongnu.org; Wed, 17 Mar 2021 12:19:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1615997940; h=from:from:reply-to: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=um7nWXWDtjrvzttPPpyWEubDdZm5njBRag//a+bbMss=; b=Ej9L7h3lrZTsM+0QLM2d207APRpnJo8PMi8zlSx3G1BFydgKlEcI8EurjB1eIilCWYgo5Y AkEzuXrFGPG6PtJXwZH/ngIcItExUTCYgIMKdjyFDFAXUraqRbo1fC6Z4IDDt8sFzlBsU5 dPQCU/nTlleIdbcF3pC+npf1is9/Rl8= 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-546-nj7N6kX1Oxu5qHSYi-Onww-1; Wed, 17 Mar 2021 12:18:58 -0400 X-MC-Unique: nj7N6kX1Oxu5qHSYi-Onww-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 49898180FCA3; Wed, 17 Mar 2021 16:18:57 +0000 (UTC) Received: from redhat.com (ovpn-113-247.ams2.redhat.com [10.36.113.247]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 71F622BFEC; Wed, 17 Mar 2021 16:18:56 +0000 (UTC) Date: Wed, 17 Mar 2021 16:18:53 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Reinoud Zandijk Subject: Re: Win10 always takes 100% cpu power even when idle Message-ID: References: MIME-Version: 1.0 In-Reply-To: User-Agent: Mutt/2.0.5 (2021-01-21) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Received-SPF: pass client-ip=63.128.21.124; envelope-from=berrange@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=-0.251, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=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: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, Mar 17, 2021 at 05:11:22PM +0100, Reinoud Zandijk wrote: > Hi, > > when executing Qemu with > > qemu-system-x86_64 -m 4G -smp cores=2 -M q35 -snapshot \ > -drive file=/home/reinoud/Downloads/Win10-demo.raw,format=raw \ > -rtc base=localtime,clock=host -spice port=5924,disable-ticketing=on \ > -vga qxl -usb -device usb-tablet -net nic -net tap,ifname=tap0,script=no > > my cpu usage in Windows10 *allways* reports 100% cpu usage. On the host system > its always 190%+ ie it is really taking two cores completely. > > Using our NVMM accelerator makes it run a whole lot faster, as good as native > speed, but it always takes up the whole two processors too! Windows10 also > *allways* reports 100% cpu usage. Its not a startup thing for even when > letting it run for quite some time never reduces the cpu time. > > In contrast, running NetBSD in the VM takes no CPU time at all when idle. > > When Googling about this, I saw this come by quite often. Is there something > Qemu can do about this? What makes it spin like this and why is it Windows10 > specific? This is a specific VM aware version too if I may believe it saying > so. I already replaced drivers to virtio etc but to no avail. Always 100% CPU > time for all CPUs. > > Could this also be an ACPI thing? IIRC, "-usb" still adds a USB-1 controller and that's known to be bad for causing high load in Windows guests in particular. So before debugging anything else, I'd suggest configuring a USB-3 controller instead - see docs/usb2.txt XHCI info. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|