Date: Wed, 16 Sep 2020 03:58:53 -0400 From: Aryeh Friedman <aryeh.friedman@gmail.com> To: Alexey Dokuchaev <danfe@freebsd.org> Cc: Niclas Zeising <zeising@freebsd.org>, FreeBSD Mailing List <freebsd-questions@freebsd.org>, freebsd-x11@freebsd.org Subject: Re: Is there any performance difference between udev and evdev in xorg? Message-ID: <CAGBxaXnkSwo0fa1exreXkaKNMjPXmDyVuUNbEH5w_Fxtf10ntw@mail.gmail.com> In-Reply-To: <20200916073731.GA45977@FreeBSD.org> References: <CAGBxaX=LvdPgR3sm%2BWL-QXn0%2BQoy1%2BzpvxRgf_1v7Oq4qyNmgA@mail.gmail.com> <20200916040110.GA46039@FreeBSD.org> <9fcf11e9-6466-3660-5322-997ed8cb3ca7@freebsd.org> <20200916073731.GA45977@FreeBSD.org>
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Sorry to top post but there seems to be a message missing in the thread On Wed, Sep 16, 2020 at 3:37 AM Alexey Dokuchaev <danfe@freebsd.org> wrote: > On Wed, Sep 16, 2020 at 08:41:28AM +0200, Niclas Zeising wrote: > > On 2020-09-16 06:01, Alexey Dokuchaev wrote: > > > On Tue, Sep 15, 2020 at 10:55:31PM -0400, Aryeh Friedman wrote: > > >> What if any is the performance difference between udev and evdev when > > >> configuring xorg? Also do I need to use one or the other consistently > > >> or can I intermix them? > > > > > > If you don't need them (e.g. because this is desktop system without > > > fancy input devices), you'd better off with disabling both of them > > > altogether and use good old traditional way, that is, simply install > > > xf86-input-{keyboard,mouse} and let X.org handle those peripherals. > > > > > > Yes, you would still be able to plug and unplug your USB mice and > > > they will be detected and working as expected. > > > > > > TL;DR: DEVD/UDEV support is overrated and usually not needed at all. > > > > This is bad advice. > > OK, let's see why is it bad. :-) > > > The DEVD support in xorg-server might go away, since it is a FreeBSD > > only solution and the udev/evdev is similar to what is used on Linux. > > Does this imply that DEVD support in X.org is technically inferior to > udev/evdev, or it might get deprecated just because they prefer Linux > way, regardless of the actual design and implementation quality? Kind > of tangentially related question, but this might help to foresee what > to expect from future X.org development. > > > If you are using Wayland, it is also the only way to use input devices. > > Wayland is overrated and unneeded as well. Plus, we're discussing X11 > here and X.org server in particular, how's that even relevant? > > > If you are using the default configuration of xorg on FreeBSD 12.1 or > > later, using udev is the default. This means using xf86-input-libinput > > as the input device driver in X, and not xf86-input-{keyboard,mouse}. > > This gives much better support for things like synaptics touchpads and > > similar devices. > > Like I've said initially, these might come handy, but for "desktop system > without fancy input devices", what's the point of bringing another layer > of abstraction (xf86-input-libinput) rather then let X.org talk to device > drivers drivers directly and not having to deal with evdev/libinput bugs, > tinker with sysctls (kern.evdev.rcpt_mask), etc.? > > > You can configure such devices either by adding X configuration snippets > > to /usr/local/etc/X11/xorg.conf.d/ or by using xinput on the command line > > Right, and with the old way, device configuration snippets are not needed. > Just that simple. So, the advice does not look that bad after all. :-) > > TL;DR: if there's a simpler solution/approach which is sufficient for one's > needs, e.g. for simple three-button mouse and pc104 keyboard, just dump the > extra xf86-input-libinput bloat and stick to old, well-tested, solid code > which just works(tm). > > ./danfe > -- Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
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