Re: Recipe for disappointment? (Video vs SCSI on 7600)

Tom Tubman Wed, 10 Sep 2003 10:02:36 -0700

> I am absolutely sure as I have tested it using 3 different means.

 The best being a RAM disk and using ATTO's disk transfer tests.
 Also, GaugePro's RAM speed gives the same numbers.  In OS X, XBench's
 memory tests which test system RAM give the same number.


OK, I just ran XBench on this bax, and I got 105.68 MB/s for Fill,
26.16 MB/s for Copy, and 64.27-69.01 for Stream. None of these match
the 50 MB/s you're talking about.

My 7600's XBench Stream numbers run at 90-99MB/sec at a 53 MHz bus speed with a G3 installed so you're right about the numbers, they don't match. In OS 9, this setup gets 52 MB/sec with RAM disk/ATTO and GaugePro, so these aren't quite 2x those numbers (re: your previous post) either.

Re: an earlier mention about G3 vs. G4 throughputs: I'm not sure what to think about the *real* throughput for these bus/memory systems but it does change when a G4 is added. I found my XBench results with a Beige G3/500 and Beige G4/433 (closest match I have):

G3/500

Memory Test   29.94
   System   29.25
      Allocate   93.50   49.18 Kalloc/sec
      Fill   79.65   456.77 MB/sec
      Copy   12.61   63.05 MB/sec
   Stream   30.65
      Copy   30.13   131.76 MB/sec
      Scale   30.17   131.65 MB/sec
      Add   30.64   139.40 MB/sec
      Triad   31.71   139.35 MB/sec

G4/433

Memory Test   35.63
   System   32.12
      Allocate   75.41   25.43 Kalloc/sec
      Fill   40.73   233.55 MB/sec
      Copy   17.99   89.93 MB/sec
   Stream   40.00
      Copy   38.48   168.26 MB/sec [altivec]
      Scale   38.61   168.47 MB/sec [altivec]
      Add   40.90   186.10 MB/sec [altivec]
      Triad   42.25   185.66 MB/sec [altivec]

Odd how the Allocate and Fill go down greatly while the others go up with the G4. Notice the use of altivec in the Stream benchmark. Problem is, I get varying numbers from XBench for Memory scores as well as CPU scores. Other XBench benchmarks are more consistent but it's hard to get consistency with these 2 tests.

- Tom


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Re: Recipe for disappointment? (Video vs SCSI on 7600)

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