Date: Tue, 31 Jul 2007 17:45:40 -0700 (PDT) From: youshi10@u.washington.edu To: Brett Davidson <brett@net24.co.nz> Cc: questions@freebsd.org Subject: Re: A wee while ago, USB support on FreeBSD6.2 SMP systems was discouraged. Is that still the case? Message-ID: <Pine.LNX.4.43.0707311745400.21832@hymn01.u.washington.edu> In-Reply-To: <46AFCE76.7090809@net24.co.nz>
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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.
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