Date: Mon, 22 May 2006 20:37:13 +0200 From: "Daan Vreeken [PA4DAN]" <Danovitsch@vitsch.net> To: "Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=" <des@des.no> Cc: Arch@freebsd.org, Sergey Matveychuk <sem@freebsd.org>, Robert Watson <rwatson@freebsd.org>, Freebsd-USB@freebsd.org, Hans Petter Selasky <hselasky@c2i.net> Subject: Re: Resend with subject: No more non-MPSAFE network device drivers, please! Message-ID: <200605222037.14030.Danovitsch@vitsch.net> In-Reply-To: <86y7wum9ow.fsf@xps.des.no> References: <20060522144542.T21787@fledge.watson.org> <20060522145953.I21787@fledge.watson.org> <86y7wum9ow.fsf@xps.des.no>
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On Monday 22 May 2006 16:10, Dag-Erling Smørgrav wrote: > Robert Watson <rwatson@FreeBSD.org> writes: > > Per discussion at the developer summit, a significant rewrite of the > > USB code is needed to make it MPSAFE. Volunteers welcome. > > HP Selasky claims to have a working Giant-free USB stack: (added him to the 'cc' list) > http://www.turbocat.net/~hselasky/usb4bsd/index.html > > No idea how well it works, though. I have been running his USB driver on a production server for months here without a single problem. I use his ugen implementation to communicate with a custom made USB device. On FreeBSD's USB driver a stress test would fail after max 40,000 requests. With his USB driver I have successfully made over 30,000,000 requests before stopping the test manually. There is a problem with his code though. (At least, there was back when I last looked at it, correct me if I'm wrong.) He has completely rewritten the OHCI, UHCI and EHCI parts, but kept the original (network, storage, etc) drivers. For the original drivers to work he has added some wrapper functions. Back when I looked these wrappers didn't work out of the box for the devices I have tried. All "old" drivers need to be converter to "new world order" for them to work properly. That's the only problem I have been having with his driver : You get a better USB stack, but with less working drivers. I think it would be great to get his code into -current, but some developers would have to help out to convert the existing drivers. -- Daan
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