From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52332) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bww5u-0007SZ-HP for qemu-devel@nongnu.org; Wed, 19 Oct 2016 15:00:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bww5p-0006Og-NL for qemu-devel@nongnu.org; Wed, 19 Oct 2016 15:00:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56922) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1bww5p-0006Nt-I8 for qemu-devel@nongnu.org; Wed, 19 Oct 2016 15:00:01 -0400 Date: Wed, 19 Oct 2016 19:59:56 +0100 From: "Dr. David Alan Gilbert" Message-ID: <20161019185956.GH2035@work-vm> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: Re: [Qemu-devel] Infinite IRQ injection when trying windows 10 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: //-//ani Nemati Cc: qemu-devel@nongnu.org * //-//ani Nemati (hani.nemati@gmail.com) wrote: > Hi, > > Recently I was trying windows 10 on top of Qemu-KVM and I saw 4% of CPU is > being used all the time even when the windows VM is idle. I tested it for > nested VM (Linux(L0)->Linux(L1)->windows(L2)) and I saw CPU usage increased > upto 45%. I traced my host and I saw there is an infinite interrupt loop > which injected by qemu main process to my windows VM. I also traced the > windows machine and I saw System process is handling that interrupt. The > main qemu process injects IRQ 209 periodically. I wonder if it is a > bug!!!!! What's the qemu commandline you're using and what version of qemu? Also, what host hardware? Dave > Cheers, > Hani -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK