From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KbqkO-0000I7-H1 for qemu-devel@nongnu.org; Sat, 06 Sep 2008 01:54:12 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KbqkN-0000HV-8s for qemu-devel@nongnu.org; Sat, 06 Sep 2008 01:54:11 -0400 Received: from [199.232.76.173] (port=45122 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KbqkN-0000HS-04 for qemu-devel@nongnu.org; Sat, 06 Sep 2008 01:54:11 -0400 Received: from hera.kernel.org ([140.211.167.34]:45582) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1KbqkM-0005YR-Fd for qemu-devel@nongnu.org; Sat, 06 Sep 2008 01:54:10 -0400 Message-ID: <48C21AF8.3040803@kernel.org> Date: Fri, 05 Sep 2008 22:54:00 -0700 From: Max Krasnyansky MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] EHCI (usb 2.0) support Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, kvm@vger.kernel.org With my latest USB patches, that I just sent out, UHCI support is probably as good as it gets. I tested all kinds of devices with Linux and XP guests and things are solid. Host USB is now fully async and I do not see any delays/jerkiness anymore. However, overall performance can certainly be improved by supporting EHCI (ie usb-2.0 stuff). For example native performance of an external USB hard drive is ~28MB/sec (measured with hdparm). The same drive attached to the Linux guest gives me about 500KB/sec. Huge difference. So I'm going to start working on EHCI (starting tomorrow). If somebody has any EHCI code I can use let me know. Max