From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=58049 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OGpRd-0002WO-PG for qemu-devel@nongnu.org; Tue, 25 May 2010 04:25:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OGpRc-0001q9-E0 for qemu-devel@nongnu.org; Tue, 25 May 2010 04:25:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41179) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OGpRc-0001pw-5x for qemu-devel@nongnu.org; Tue, 25 May 2010 04:25:00 -0400 Message-ID: <4BFB8956.8070308@redhat.com> Date: Tue, 25 May 2010 11:24:54 +0300 From: Avi Kivity MIME-Version: 1.0 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] Re: Windows guest debugging on KVM/Qemu List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Neo Jia Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org 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