From: Ben Nizette <bn@niasdigital.com>
To: Wolfgang Grandegger <wg@grandegger.com>
Cc: Nicholas Mc Guire <hofrat@hofr.at>,
linux-embedded <linux-embedded@vger.kernel.org>
Subject: Re: UIO - interrupt performance
Date: Tue, 21 Oct 2008 20:32:07 +1100 [thread overview]
Message-ID: <1224581527.3954.123.camel@moss.renham> (raw)
In-Reply-To: <48FD7D65.1070409@grandegger.com>
On Tue, 2008-10-21 at 08:57 +0200, Wolfgang Grandegger wrote:
> Ben Nizette wrote:
> >
> > As in examples of the userspace half? Unfortunately uio-smx isn't ready
> > to fly thanks to some significant production delays but the userspace
> > half of the Hilscher CIF driver can be found at
> > http://www.osadl.org/projects/downloads/UIO/user/
>
> As I see it, mainly the license conditions attract people to use UIO.
> Performance is not that important.
>
Ohw god I hope not. If people want to keep their stuff proprietary they
can supply binary-only modules a la nvidia. Thankfully such nonsense is
fairly uncommon these days.
UIO is not a set of hooks for general userspace drivers, it can't
replace 99% of kernel drivers. It exists to allow easy and
high-performance interfacing to a particular family of devices - those
which simply need to shift data around and have an interrupt telling you
when they're done.
--Ben.
next prev parent reply other threads:[~2008-10-21 9:32 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-20 9:55 UIO - interrupt performance Douglas, Jim (Jim)
2008-10-20 10:28 ` Ben Nizette
[not found] ` <Pine.LNX.4.58.0810200258210.2562@vlab.hofr.at>
2008-10-20 22:12 ` Ben Nizette
2008-10-21 6:57 ` Wolfgang Grandegger
2008-10-21 9:32 ` Ben Nizette [this message]
2008-10-20 10:30 ` Christian SCHWARZ
2008-10-20 11:55 ` Marco Stornelli
2008-10-20 13:20 ` Paul Mundt
2008-10-20 16:13 ` Bill Gatliff
2008-10-21 8:36 ` Marco Stornelli
2008-10-21 9:01 ` Alessio Igor Bogani
2008-10-21 9:30 ` Marco Stornelli
2008-10-21 9:37 ` Ben Nizette
2008-10-21 10:24 ` Marco Stornelli
2008-10-21 10:28 ` Wolfgang Grandegger
2008-10-21 11:39 ` Bill Gatliff
2008-10-20 12:48 ` Thomas Petazzoni
2008-10-20 16:25 ` Bill Gatliff
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