E7500 Chipset

Don Holmgren djholm at fnal.gov
Fri Jul 19 09:56:02 PDT 2002

Myrinet bandwidth on E7500 is considerably better than an i860.  For
gm_allsize, large message bandwidths are about 240 MB/sec vs 165 MB/sec.  
For netpipe over mpich-gm, large message bandwidths are about 225 MB/sec
vs 155 MB/sec.  Below 1K-byte message sizes the performance are
essentially identical.   Graphs are here:


Don Holmgren

On Fri, 19 Jul 2002, Greg Lindahl wrote:

> On Fri, Jul 19, 2002 at 09:25:44PM +0900, Iwao Makino wrote:
> > Good memory bandwidth, perhaps i860 chipset base is good idea, but be careful,
> > if you want to get
> > PCI bus performance from them, DON'T USE i860 based board.
> > 
> > Here's good reason:
> That reason is true; however, it doesn't seem to hurt the bandwidth
> that Myrinet gets across the PCI. This was discussed at length on this
> list a while ago.
> http://www.conservativecomputer.com/myrinet/perf.html
> -- greg

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