From: Bütow, Michael (michael.buetow@comsoft.de)
Date: Mon Sep 26 2005 - 06:17:52 EDT
Hello managers,
This is more an informational mail about a curious case of clock drift that was observed on DS10 machines equipped with 3Dlabs Oxygen VX1 graphics cards, running Tru64 4.0F with PK7.
As soon as lots of X11 graphical actions were done on a machine (by scrolling some output in a dxterm, or by running "x11perf -scroll500"), the clocks would start slowing immediately at an insane rate (I estimate up to 16000 PPM). Definitely, running the benchmark over a few minutes, we could slow the clocks by a few seconds.
We strongly suspect it to be a case of lost clock interrupts, maybe the graphics driver for those Oxygen cards.
On DS10's with other graphics cards, no such problem has been noticed.
The behaviour could be reproduced in-house on similar equipment (same graphics cards) under Tru64 4.0F, but not under 5.1B (PK3).
Here ends the description - now I would like to ask if anyone can point me to references about the specs of the clock crystals used on DS10/DS15 equipment, and where they are located on the MB ?
Thanks and regards,
Michael
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