Date: Thu, 11 Dec 2003 04:19:49 -0800 From: Alfred Perlstein <alfred@FreeBSD.org> To: Eivind Eklund <eivind@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/isa psm.c Message-ID: <20031211121949.GQ75620@elvis.mu.org> In-Reply-To: <20031211120847.GA74780@FreeBSD.org> References: <200312111128.hBBBSB6m099331@repoman.freebsd.org> <20031211120847.GA74780@FreeBSD.org>
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* 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. :) > [...] > > Lastly I'd like to note that my experience with Windows shows me that > > somehow the Microsoft PS/2 driver typically avoids this problem, but > > that may only be possible when running the mouse in a dumb-ed down PS/2 > > mode that Belkin recommends on their site. > > It'd be interesting to know what they do. Yah, me too. :) -- - Alfred Perlstein - Research Engineering Development Inc. - email: bright@mu.org cell: 408-480-4684
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