Date: Thu, 11 Dec 2003 11:48:00 -0500 From: "Brian F. Feldman" <green@FreeBSD.org> To: Alfred Perlstein <alfred@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/isa psm.c Message-ID: <200312111648.hBBGm0Jb054459@green.bikeshed.org> In-Reply-To: Message from Alfred Perlstein <alfred@FreeBSD.org> of "Thu, 11 Dec 2003 04:19:49 PST." <20031211121949.GQ75620@elvis.mu.org>
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Alfred Perlstein <alfred@FreeBSD.org> wrote: > * Eivind Eklund <eivind@FreeBSD.org> [031211 04:08] wrote: > > On Thu, Dec 11, 2003 at 03:28:11AM -0800, Alfred Perlstein wrote: > > > Log: > > > Significantly reduce the "jitter" that is typical for PS/2 mice > > > when using a KVM. > > [...] > > > > > > The actual solution that appears to offer the best clamping of > > > jitter is to buffer the mouse packets if we've not seen mouse > > > activity for more than .5 seconds. Then waiting to flush that data > > > for 1/20th of a second. If within that 20th of a second we get any > > > packets that do fail the weak test we drop the entire queue and > > > back off accepting data from the mouse for 2 seconds and then repeat > > > the whole deal. > > > > Have you tested this with enough high speed interactive games? 50ms > > (1/20s) is three to four frames, and quite a lot of delaying input. > > There are a number of types of games that require faster response than > > this. I'm not entirely sure how it influences most mouse-run games - I > > know that at least some 2D fighting games with joystick absolutely > > required 1-frame (20ms) response on 50Hz displays. > > There is only a delay if the mouse has been idle for .5 seconds, > otherwise the reaction is immediate. I guess we could tune that > up to 2 seconds, it's also tunable via sysctls. Feedback, testing > and tweaking are encouraged, this is -current afterall. :) I can't imagine that most people that are playing these sorts of games use a KVM switch, and as such probably have no need for a PS/2 mouse and would want to use a USB mouse instead. Still, the default should probably be several seconds at least; when I used a KVM I don't think I ever managed to switch from and back to one of the computers in less than a few seconds :) -- Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ <> green@FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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