From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LPL4R-0002Pk-U0 for qemu-devel@nongnu.org; Tue, 20 Jan 2009 13:11:28 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LPL4O-0002Ob-H5 for qemu-devel@nongnu.org; Tue, 20 Jan 2009 13:11:26 -0500 Received: from [199.232.76.173] (port=46097 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LPL4O-0002OX-9C for qemu-devel@nongnu.org; Tue, 20 Jan 2009 13:11:24 -0500 Received: from mx20.gnu.org ([199.232.41.8]:43952) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1LPL4O-0000Cf-0g for qemu-devel@nongnu.org; Tue, 20 Jan 2009 13:11:24 -0500 Received: from mail.codesourcery.com ([65.74.133.4]) by mx20.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1LPL4M-0004dD-SE for qemu-devel@nongnu.org; Tue, 20 Jan 2009 13:11:23 -0500 From: Paul Brook Date: Tue, 20 Jan 2009 18:11:18 +0000 References: <20090119162633.GO29175@csclub.uwaterloo.ca> <200901200133.25029.paul@codesourcery.com> <4975B3F6.6050706@eu.citrix.com> In-Reply-To: <4975B3F6.6050706@eu.citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200901201811.19920.paul@codesourcery.com> Subject: [Qemu-devel] Re: Extremely slow graphic updates Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefano Stabellini Cc: qemu-devel@nongnu.org, Lennart Sorensen > What is the quickest way for me to reproduce this problem? > Have you seen this on ppc emulation only? > > I gather that the guest is in text mode. Have you seen this in graphical > mode too? If yes, what was the resolution of the guest? Steps to reproduce: - Start qemu (doesn't matter which target or guest OS). - Press c-a-2 to switch to the monitor. - type "help" - Watch the output slowly appear over the next 30 seconds Running qemu over a forwarded X connection from a different machine (i.e. ssh -X) suffers a marked slowdown. With this configuration the early x86 boot stages are visibly much slower, in addition to the virtual console slowness mentioned above. The monitor virtual console, VGA text mode and the graphical mode used by the knoppix bootloader[1] all show marked slowdown. It's unclear whether truecolor modes are effected. [1] I'm guessing this is either VGA 16 color or VESA 256 color mode. > What is the resolution of your host? What X11 extensions are you using? I have reproduced on a couple of different machines. Both are fairly standard Debian sid installs, without any special Xorg config. One is x86, the other x86-64, both 32-bit color depth. One nVidia FX5200(nv)@800x600, one ATI HD3470(radeonhd)@1600x1200. > Do you set SDL_VIDEODRIVER anywhere? No. Paul