Author: Roy Eassa
Date: 14:36:55 10/25/02
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On October 23, 2002 at 17:00:35, Paul J. Messmer wrote: > >Well, not really. One of the PDAs that I own is a Toshiba e740, which is a >Pocket PC with the same Intel 400MHz PXA250 processor as the ASUS. It's a lot >faster for chess than my (Dragonball) Palm, but not as fast you might think. > >Pocket Fritz on this machine only gets a few thousand nodes per second, similar >to a build of Crafty running on the e740. My rough estimate is that for chess, >this PDA gets the equivalent performance of something like a 33 Mhz Pentum (like >the original P5 architecture, with only L1 cache and no L2 cache). > >Interestingly, when comparing this PDA to a Compaq iPaq with a different ARM >processor (not an XScale from Intel, and only running at ~200 Mhz), Pocket Fritz >was 10% FASTER on the iPaq! DOH! Double the Mhz, take 10% off of performance >on the same binary :-) I don't know whether to attribute this to a possibly >different memory architecture between the machines, or the differences in >microarchitecture between the processors (the XScale has a longer pipeline for >example), or what. From what I hear, it's because the OS does not properly handle the processor's special modes (it normally isn't supposed to run at 400 MHz all the time). I bet a future (the next?) version of the OS will make all the PPC chess programs suddenly a lot stronger. > >It's far faster than my old Palm. But definitely at least an order of magnitude >slower than a 400 mhz PC. > New Palm OS machines will be able to use the same processor, but shouldn't suffer from the above-described issue. >On October 23, 2002 at 07:17:19, ludicrous wrote: > >>Wow! 400 mhz! Like carrying with you a portable pentium 3! Pocket Fritz would >>be delighted!
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