Date: Thu, 11 Dec 2003 04:08:47 -0800 From: Eivind Eklund <eivind@FreeBSD.org> To: Alfred Perlstein <alfred@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/isa psm.c Message-ID: <20031211120847.GA74780@FreeBSD.org> In-Reply-To: <200312111128.hBBBSB6m099331@repoman.freebsd.org>
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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. [...] > 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. > Revision Changes Path > 1.63 +256 -110 src/sys/isa/psm.c Eivind.
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