Aloha!
(Sorry for jumping right in to the thread here...)
This might be a good time to mention the STREAM benchmark developed by
John McCalpin. It measures sustained bandwidth of systems. The official
web page is at:
http://www.cs.virginia.edu/stream/
If you check the section under "PC-compatible Results" you should find
machines comparable to what you are measuring. Also, there are a tool
out there that will measure effective latency for cache levels and main
store for a system - both first page and burst transfers. Need to search
my ever inflating bookmarks...
The news group comp.arch might be a source of info and would probably be
interested in your results too.
Matt Dillon wrote:
>
> :You should see what speed RamBus they were using, 600 or 800 Mhz. It is
> :pretty fast for large memory writes and reads. It'd be cool to see how
> :the different speeds stack up against one another. DDR comparisons would
> :be cool too. Yeah, for the frequency, you have to take into account that
> :these are different chips than your PIII or Athlons and the performance
> :difference is not simply a linear relation to the frequency rating
> :(i.e.: 1.3Ghz is not really over one-billion instructions per second,
> :just clocks per second). We installed Linux at a UC Free OS User Group
> :installfest here in cincinnati, it was pretty sweet. The machine was a
> :Dell and the case was freakin' huge. It also came with a 21" monitor and
> :stuff. The performace was really good, but not really any better than I
> :hads gleaned from the newer 1Ghz Athlons or PIII's.
>
> It says 800 MHz (PC-800 RIMMs) on the side of the box.
>
> The technical reviews basically say that bulk transfer rates for
> RamBus blow DDR away, but DDR wins for random reads and writes
> due to RamBus's higher startup latency. I don't have any DDR
> systems to test but I can devise a test program.
>
> Celeron 650 MHz (HP desktop) (DIMM)
> 16.16 MBytes/sec (copy)
>
> Pentium III 550 MHz (Dell 2400) (DIMM)
> 25.90 MBytes/sec (copy)
>
> Pentium 4 1.3 GHz / PC-800 RIMMs (Sony VAIO)
> 32.38 MBytes/sec (copy)
>
> -Matt
--
Cheers!
Joachim - Alltid i harmonisk svängning
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Joachim Strömbergson ASIC SoC designer, nice to CUTE animals
Phone: +46(0)31 - 27 98 47 Web: http://www.ludd.luth.se/~watchman
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