Re: Looking for the cause of poor I/O performance

On Saturday 04 December 2004 09:16 pm, Guy wrote:

Ok, now I am confused.
I have a second Dell Precision Workstation 410:

System A:
CPUs	2 X 500 MHz
RAM	4 X 128 Meg SDRAM
Bus	100 MHz
Timing buffer-cache reads:   128 MB in  0.87 seconds =147.13 MB/sec

System B:
CPUs	2 X 1000 MHz
RAM	4 X 256 Meg Registered SDRAM
Bus	100 MHz
Timing buffer-cache reads:   524 MB in  2.00 seconds =262.00 MB/sec

Why is system B almost twice as fast?
Is registered RAM faster?
I know the CPU speed is twice as fast, but the system bus is still 100 MHz.

Memory interleaving, perhaps? Registered ram has higher latency. It's possible 
that the machine is made to do memory interleaving with ECC ram to boost 
performance.. 

TJ Harrell