On Nov 18, 2005, at 10:20 PM, David Ferguson wrote:
HyperTransport and Hyperthreading are not the same thing.
Performance of USB hardware is almost always related to the
architecture of the host controller and system logic. Modern
architectures optimize for large bursty traffic -- at the expense
of latency for small transfers.
The architecture of USB host controllers is such that they need low-
latency on small transfers to realize short inner-packet gaps.
You're doing the right thing by testing. That is helps you
understand the reality of the delivered solutions.
David Ferguson
USB Software Team
Apple Computer
At 10:09 PM -0500 11/18/05, Juan P. Pertierra wrote:
Any input on whether the USB is faster on the Quad G5 than it is
on the Dual G5? The tests I have done show that the Dual 2.5Ghz
can handle less packets per microframe than the powerbook or mac
mini. I believe somebody said this had to do with the
hyperthreading. However from the Apple website it looks like this
area might have been improved, anybody know if this allows the USB
Host Controller to allow as many packets/microframe as it does on
the mini and PB?
From the Apple website:
"Serial ATA, FireWire, USB, audio, and wireless technologies are
integrated through two bidirectional 800MHz HyperTransport
interconnects for a maximum throughput of 1.6 GBps, providing
ample throughput for a host of peripheral devices"
Thanks!
Juan
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References:
>Quad G5 USB... (From: "Juan P. Pertierra" <email@hidden>)
