From owner-freebsd-stable@FreeBSD.ORG Tue Sep 17 09:23:21 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 DE0D3F73; Tue, 17 Sep 2013 09:23:21 +0000 (UTC) (envelope-from hans.petter.selasky@bitfrost.no) Received: from mta.bitpro.no (mta.bitpro.no [92.42.64.202]) by mx1.freebsd.org (Postfix) with ESMTP id 6C574282E; Tue, 17 Sep 2013 09:23:21 +0000 (UTC) Received: from mail.lockless.no (mail.lockless.no [46.29.221.38]) by mta.bitpro.no (Postfix) with ESMTP id 689847A1DB; Tue, 17 Sep 2013 11:23:20 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by mail.lockless.no (Postfix) with ESMTP id EB0AC8F27D0; Tue, 17 Sep 2013 11:23:37 +0200 (CEST) X-Virus-Scanned: by amavisd-new-2.6.4 (20090625) (Debian) at lockless.no Received: from mail.lockless.no ([127.0.0.1]) by localhost (mail.lockless.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4jpuJKJqlQJj; Tue, 17 Sep 2013 11:23:37 +0200 (CEST) Received: from laptop015.home.selasky.org (cm-176.74.213.204.customer.telag.net [176.74.213.204]) by mail.lockless.no (Postfix) with ESMTPSA id 0439A8F27B7; Tue, 17 Sep 2013 11:23:36 +0200 (CEST) Message-ID: <52381FCA.5030509@bitfrost.no> Date: Tue, 17 Sep 2013 11:24:26 +0200 From: Hans Petter Selasky Organization: Bitfrost A/S User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:17.0) Gecko/20130522 Thunderbird/17.0.6 MIME-Version: 1.0 To: Harald Schmalzbauer Subject: Re: umcs (4-Port-USB-serial) triggering way too much ehci IRQs References: <52372DBA.6020703@omnilan.de> <875323075.20130917124437@serebryakov.spb.ru> <523816E1.10603@omnilan.de> <1857258551.20130917124737@serebryakov.spb.ru> <5238198C.3070604@bitfrost.no> <52381BAC.5010801@omnilan.de> In-Reply-To: <52381BAC.5010801@omnilan.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Cc: lev@FreeBSD.org, FreeBSD Stable , freebsd-usb@FreeBSD.org 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: Tue, 17 Sep 2013 09:23:21 -0000 On 09/17/13 11:06, Harald Schmalzbauer wrote: > Bezüglich Hans Petter Selasky's Nachricht vom 17.09.2013 10:57 > (localtime): >> On 09/17/13 10:47, Lev Serebryakov wrote: >>> Hello, Harald. >>> You wrote 17 сентября 2013 г., 12:46:25: >>> >>> HS> The Y is the device addr @ bus #X. >>> Oh :) >>> >>> HS> Same posted some seconds ago :-) >>> Yep, exactly the same pattern. >>> >> >> >> Hi, >> >> Could you show the configuration descriptor for your device? >> >> usbconfig -d X.Y dump_curr_config_desc > > Shall we switch to non-list-comm? Hi, That's OK. > Hmm, in my case, this 4-port-serial-USB-hub will be used as console > concentrator. So most time it's doing nothing, just feeding tmux with > consoles output. What latency are we talking about? Less than a some > milliseconds should be fine. > What I'm curious about is why my prolific USB-serial converter doesn't > generate these high irqs. Try this patch and see what happens: ================================================================== --- umcs.c (revision 255492) +++ umcs.c (local) @@ -230,6 +230,7 @@ .bufsize = 0, /* use wMaxPacketSize */ .callback = &umcs7840_intr_callback, .if_index = 0, + .interval = 20, /* ms */ }, }; BTW: I see that the umcs driver shouldn't do synchronous control transfers from the USB interrupt transfer callback. This should be postponed into some worker thread, for example the USB explore thread. See USB audio driver for an example. --HPS