From owner-freebsd-stable@FreeBSD.ORG Mon Sep 16 16:11:53 2013 Return-Path: Delivered-To: freebsd-stable@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 9461F404; Mon, 16 Sep 2013 16:11:53 +0000 (UTC) (envelope-from h.schmalzbauer@omnilan.de) Received: from s1.omnilan.de (s1.omnilan.de [217.91.127.234]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 1E0E0291B; Mon, 16 Sep 2013 16:11:52 +0000 (UTC) Received: from titan.inop.wdn.omnilan.net (titan.inop.wdn.omnilan.net [172.21.3.1]) (authenticated bits=0) by s1.omnilan.de (8.13.8/8.13.8) with ESMTP id r8GGBkBQ078769 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 16 Sep 2013 18:11:48 +0200 (CEST) (envelope-from h.schmalzbauer@omnilan.de) Message-ID: <52372DBA.6020703@omnilan.de> Date: Mon, 16 Sep 2013 18:11:38 +0200 From: Harald Schmalzbauer Organization: OmniLAN User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; de-DE; rv:1.9.2.8) Gecko/20100906 Lightning/1.0b2 Thunderbird/3.1.2 MIME-Version: 1.0 To: lev@FreeBSD.org, FreeBSD Stable Subject: umcs (4-Port-USB-serial) triggering way too much ehci IRQs X-Enigmail-Version: 1.1.2 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigBB68B078A4FE603194418B07" X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Sep 2013 16:11:53 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigBB68B078A4FE603194418B07 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: quoted-printable Hello, I have some of these 4-Port-Serial-USB-Hubs: http://www.delock.com/produkte/F_673_USB---Seriell_87414/merkmale.html They have the MosChip MCS7840 inside, wich also understands RS485/422 besides RS232. FreeBSDs umcs(4) supports the RS232 mode with standard baudrates and works with that device. Unfortunately, as soon as I open any of the 4 cuaU0.x ports, there are 500irq/s from ehci. These irqs also accur if the port is closed again (until I unload the umcs module). These irqs prevent virtual machines and also real hardware from deeper sleeping. In my case, it's a huge ammount of lost power saving. I also saw that the windows driver of the MCS7840 consuming a lot of CPU-cycles (XP-ESXi guest). Is there any chance to tranquilize? The 4-Port prolific model (http://www.delock.com/produkte/F_673_USB---Seriell_61518/merkmale.html) doesn't show these unneccessary irqs btw.! Thanks, -Harry --------------enigBB68B078A4FE603194418B07 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAlI3LcIACgkQLDqVQ9VXb8g/TgCgwIFNO5QSoKm7+JwJc3mLLlg9 nQwAnAxoZe5qUydATd5ryBrLChlheiSA =anbH -----END PGP SIGNATURE----- --------------enigBB68B078A4FE603194418B07--