Chris Sarcone writes:
> In some cases, the Opteron will have higher bandwidth simply due to
> its on-chip memory controller architecture and DDR2 SDRAM (guessing
> you have this on your system - maybe not).
>
Yeah, opterons are amazing. For OS-bypass polling operations (where a
user process does a PIO write to send a message to its peer, then
busywaits looking at a memory location, waiting for the controller to
DMA the response from his peer) we see a 1/2rtt latency of ~3.5us on
G5, and ~2.6us on opeteron. Same hardware, and I think you both
use the same AMD-8131 PCI-X bridge to the PCI-X slots.
Drew
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