gears vs. glxgears; i915 for Linux binaries?

Boris Samorodov bsam at ipt.ru
Fri Jun 23 17:28:17 UTC 2006


On Fri, 23 Jun 2006 13:17:21 -0400 Mikhail Teterin wrote:
> First of all, allow me to thank you for the working DRI on my laptop with i915 
> chipset. Although none of my Radeon desktops work yet, this is very welcome 
> progress.

> After installing the linux_dri port, I wanted to compare the simple (glx)gears 
> results between the Linux and the native binaries.

> The /compat/linux/usr/X11R6/bin/gears appears to be the same beast, as the 
> ${X11BASE]/bin/glxgears installed by the native Xorg port.

> Running the Linux gears seemed VERY fast -- they were spinning like crazy but 
> the program reports just 1800 frames per 5 seconds -- around 380 FPS (all for 
> the default small window).

> Running the native glxgears appeared much slower, but the reported stats were 
> ~2.5 times higher -- around 950 FPS.

> Now, the reported speed difference is, likely, due to the fact, that the 
> linux_dri does not (yet?) install the i915_dri.so, so no DRI is (yet?) 
> possible for Linux programs on my laptop. But why does it *appear* to be 
> faster?

It's an optical effect. Haven't you ever see a wheel (a car or
bicycle) which *seems* to spin the wrong direction? It's the same
here. ;-)


WBR
-- 
Boris B. Samorodov, Research Engineer
InPharmTech Co,     http://www.ipt.ru
Telephone & Internet Service Provider


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