From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:58995) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gcdvV-0007YJ-8R for qemu-devel@nongnu.org; Thu, 27 Dec 2018 17:14:50 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gcdvS-0000zm-0C for qemu-devel@nongnu.org; Thu, 27 Dec 2018 17:14:49 -0500 Received: from server54-2.web-hosting.com ([198.54.126.118]:40219) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gcdvR-0000xw-PU for qemu-devel@nongnu.org; Thu, 27 Dec 2018 17:14:45 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Thu, 27 Dec 2018 17:14:41 -0500 From: liebrecht@grossmann-venter.com Message-ID: <7b6da43166f547478fcc8a7ffc09eddf@grossmann-venter.com> Subject: Re: [Qemu-devel] Qemu the right way -[Subthread Cores] List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: liebrecht@grossmann-venter.com, qemu-devel@nongnu.org For the record I have no crashes with -cpu host It works perfectly. Although I can only see 2 cpus in windows with 4 showing up in devicemanager. The first link you sent was actually the first thing I tried and I was already aware of that one. It made no difference whatsoever. My bios is latest on the rackserver , but it does not have the maximum core option in the bios. Let me update the os to latest patches. I can vaguely remeber a similar problem running wi7 pro natively. I think out of the box you get win7 home cpu limits and only after updates do you have pro lqarger cpu count activated. I may remeber wrong, but I will do that first and report back. > Since I do not have networking sorted out yet I cannot update win7 pro, > and it might be the updates which are needed for allowing more than two cpus. hm, brief search on my side resulted in this tip: https://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/windows-7-professional-x64-only-showing-2-of-8/0155f525-df73-4642-a828-21b80d1564b0 ---------- Some recommendations (in Windows, make sure you are running as Administrator): - Run MSConfig -> Change to Boot tab -> Advanced Options -> "Number of Processors", make sure there is no check mark. - Delete processor entries listed in Device Manager, then reboot. ------------- (I don't think BIOS options from this answer really apply directly to qemu case) also, if win (or some applications inside it) keep crashing with -cpu host, you can try to reload host (Linux) kvm module with additional option: "options kvm ignore_msrs=1" line (without quotes) should be added to /etc/modprobe.d/kvm.conf from https://www.passmark.com/forum/performancetest/4748-startup-error-number-4-on-qemu-bsod