From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: Windows guest debugging on KVM/Qemu Date: Tue, 25 May 2010 11:24:54 +0300 Message-ID: <4BFB8956.8070308@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org To: Neo Jia Return-path: Received: from mx1.redhat.com ([209.132.183.28]:6263 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751484Ab0EYIZA (ORCPT ); Tue, 25 May 2010 04:25:00 -0400 In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On 05/24/2010 11:07 PM, Neo Jia wrote: > hi, > > I am using KVM/Qemu to debug my Windows guest according to KVM wiki > page (http://www.linux-kvm.org/page/WindowsGuestDrivers/GuestDebugging). > It works for me and also I can only use one Windows guest and bind its > serial port to a TCP port and run "Virtual Serial Ports Emulator" on > my Windows dev machine. > > The problem is that these kind of connection is really slow. Is there > any known issue with KVM serial port driver? There is a good > discussion about the same issue one year ago. Not sure if there is any > improvement or not after that. > How slow? Can you measure it (without a debugger, just guest-to-guest file transfer)? slirp used to be ridiculously slow but some recent change made it fairly fast. Probably a missing wakeup, perhaps serial has the same problem. In any case I recommend testing with qemu-kvm.git master. -- error compiling committee.c: too many arguments to function