[3532] in RedHat Linux List
Results - Re: Xgalaga anyone?
daemon@ATHENA.MIT.EDU (Kyle Ferrio)
Fri Nov 8 23:26:06 1996
Date: Fri, 8 Nov 1996 23:22:00 -0500 (EST)
From: Kyle Ferrio <kbf@phy.duke.edu>
To: Steven Taetzsch/PicTel <Steven_Taetzsch@smtpnotes.pictel.com>
cc: redhat-list@redhat.com
In-Reply-To: <9611051630.AA01532@smtpnotes.pictel.com>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
I have some partial answers.
This is not a Redhat-specific issue, but there's been some discussion of
it here lately.
This is -not- about sluggish video performance. That is a buffer issue.
And it's not a problem on my hardware. This is about mouse clicks not
producing missles for a second or two at the beginning of waves. I call
this "mouse latency" to distinguish it from the buffer issue.
Xgal 1.6c never exhibited mouse latency under a.out kernels (up to 1.2.13)
on my old slackware installation, AFAIK and can determine.
So I compared my slackware-supplied xgal to the latest redhat-supplied
xgal. All testing was performed under a modular 2.0.18 ELF kernel. Both
copiues of xgal are 1.6c and byte-for-byte identical to the other. In
particular, ldd return identical info for each.
Extensive play-testing (essential for good statistics!) reveals that
mouse latency occurs often, but not always, under 2.0.18 ELF. If the
mouse works fine in the first wave, it almost always works fine
thereafter. Similar results were obtained under XF86 and Metro-X.
Killing gpm does not affect the results.
Finally, AFAIK nothing that xgal needs (eg sound, ext2fs) is modular in
the 2.0.18 kernel. Still, mouse latency appears to be at least indirectly
related to choice of kernel. It may be something as simple as average
system load, which will vary across kernels.
I have spent -way- too much time on this learning exercise. I tired of
xgal long ago. But if anyone has ideas, let's hear them.
Kyle Ferrio
kbf@phy.duke.edu (919) 660-2518 office
Duke University, Dept. of Physics (919) 660-2525 FAX
Box 90305, Durham N.C. 27708-0305, USA
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