From owner-freebsd-questions@FreeBSD.ORG Wed Aug 1 00:45:42 2007 Return-Path: Delivered-To: questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 03BE916A41B for ; Wed, 1 Aug 2007 00:45:42 +0000 (UTC) (envelope-from youshi10@u.washington.edu) Received: from mxout7.cac.washington.edu (mxout7.cac.washington.edu [140.142.32.178]) by mx1.freebsd.org (Postfix) with ESMTP id E009313C46A for ; Wed, 1 Aug 2007 00:45:41 +0000 (UTC) (envelope-from youshi10@u.washington.edu) Received: from hymn01.u.washington.edu (hymn01.u.washington.edu [140.142.8.55]) by mxout7.cac.washington.edu (8.13.7+UW06.06/8.13.7+UW07.06) with ESMTP id l710jeYm008281 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 31 Jul 2007 17:45:41 -0700 Received: from localhost (localhost [127.0.0.1]) by hymn01.u.washington.edu (8.13.7+UW06.06/8.13.7+UW07.03) with ESMTP id l710jeec017040; Tue, 31 Jul 2007 17:45:40 -0700 X-Auth-Received: from [192.55.52.4] by hymn01.u.washington.edu via HTTP; Tue, 31 Jul 2007 17:45:40 PDT Date: Tue, 31 Jul 2007 17:45:40 -0700 (PDT) From: youshi10@u.washington.edu To: Brett Davidson In-Reply-To: <46AFCE76.7090809@net24.co.nz> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-PMX-Version: 5.3.3.310218, Antispam-Engine: 2.5.1.298604, Antispam-Data: 2007.7.31.172433 X-Uwash-Spam: Gauge=IIIIIII, Probability=7%, Report='NO_REAL_NAME 0, __CT 0, __CT_TEXT_PLAIN 0, __HAS_MSGID 0, __MIME_TEXT_ONLY 0, __MIME_VERSION 0, __SANE_MSGID 0' Cc: questions@freebsd.org Subject: Re: A wee while ago, USB support on FreeBSD6.2 SMP systems was discouraged. Is that still the case? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Aug 2007 00:45:42 -0000 On Wed, 1 Aug 2007, Brett Davidson wrote: > youshi10@u.washington.edu wrote: >> On Wed, 1 Aug 2007, Brett Davidson wrote: >> >>> If there are patches/updates to this issue I would REALLY like to know >>> about them! :-) >>> >>> -- >>> Brett Davidson >>> Systems Engineer >>> -- Net24 Limited >>> Web: www.net24.co.nz >>> Phone: 0800 5000 24 | DDI: +64 3 962 9518 >>> -- // web hosting / email hosting / data backup // our reputation for >>> reliability precedes us >>> >>> This transmission is for the intended addressee only and is confidential >>> information. If you have received this transmission in error, please >>> delete it and notify the sender. >> >> I may be wrong, but USB support has always been giant-locked, and continues >> to be giant-locked, at least until Hans work maybe gets integrated into >> 8-CURRENT after a major code review. >> >> -Garrett >> > Thanks Garrett. > > By the way, my colleague informed me incorrectly that USB and SMP support was > an issue. (Although I am keen for this to work!) :-) Heh :). > From the latest source, the Kernel PAE conf file mentions that USB and PAE are > not known to play well together. This is my immediate concern. Not sure if that's a problem. PAE is just an ugly ugly hack, but you probably know that by now... should have gone with amd64 ;). > I presume giant-locking is one mutex that rules them all? As such, besides > being inefficient under load, how would running USB under this be a problem > with PAE? Uhm, it's sorta like that. Many drivers are still using giant-locks, but there's a lot of effort going into removing those giant locks for creating more SMP'goodness :). > Cheers, > Brett.