Messages in this thread |  | | Date | Fri, 7 Feb 1997 09:01:20 -0500 (EST) | From | Nathan Bryant <> | Subject | Re: Pentium memcpy patch. Unintended effect? |
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On Fri, 7 Feb 1997 aidas@ixsrs4.ix.netcom.com wrote:
> > I patched and compiled 2.1.25 with the Pentium memcpy patch. Everything > works fine, except for Quake. Now, Quake runs a fair bit choppier. > > I'm not really concerned about Quake. I'm more concerned whether this is > some kind of defect in my hardware, or simply a side effect of the design > of Quake. The latter seems more likely. > > The system is a P133, 32MB EDO RAM, Premio motherboard (model unknown), > XFree86 3.2.
Okay. Before I say anything stupid, let me just say that I really know next to nothing about Pentium optimizations.
That said, I do know that Quake is very floating-point intensive, and the pentium-memcpy patch uses the FPU to perform 64-bit-wide memory copies. I would guess that this would put more demand on the FPU and cause the Quake slowdown.
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