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[TopE][Macintosh][PowerBook G4 Gigabit Ethernet][I/O Performace of PowerBook G4 Rev. B]
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This is "preliminary" English versions of the context, Would you make the English in a better form and send to me.

16/Nov

I/O Performace of PowerBook G4 Rev. B
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199_ Rev. 11 Uni-North Memory controller and PCI bus bridge

199_ Rev. 11 Uni-North Memory controller and PCI bus bridge

Used Uni-North IC was Rev. 11, and performance increased.

PX Bus speed ups from 100 MHz to 133 MHz and is that AGP doubled from 2* to 4*.

But Rev.11 seems to include many hidden performance improvement.

There is support of Write Combine which is not written by Developer Note. Performance of FireWire Link Layer improved.

200_ Differentia of PowerBook G4 Gigabit Ethernet block diagram

200_ Differentia of PowerBook G4 Gigabit Ethernet block diagram

I showed difference with PowerBook G4 Titanium with block diagram.

201_ PowerPC 7451/667 and Rev. 11 Uni-North IC memory performance

The determination of memory performance of PowerBook G4 Gigabit Ethernet was difficult.

L1 performance measured memory transmission competence of 4,8,16Kbyte entity.Content was small, but, as for L2 cash built in by die internal, performance improvement more than clock rate was recognized.

The memory bus performance that uped from 100 MHz to 133 MHz improves as expected, too.

201_ PowerPC 7451/667 and Rev. 11 Uni-North IC memory performance

202_ AirMac Rev. C performance up and write combine

I compared maximum velocity at having transmitted file of 10 MB of FTP server which LAN was connected to from radio LAN base station.
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202_ AirMac Rev. C performance up and write combine

203_ MPX Bus, FireWire Link Layer and FireWire performance

As a result of I built in Toshiba MK-2016GAP in CitiDisk Jr. FastFire which carried Oxford 911 ATA-FireWire Bridge IC, and having compared maximum transmission rate at having hit in the buffer area.

Rate improvement more than 10 MB / second was recognized in PowerBook G4 Gigabit Ethernet even if used same FireWire PHY.

It will be effect of performance improvement of Rev.11 Uni-North IC internal FireWire Link Layer section.

203_ MPX Bus, FireWire Link Layer and FireWire performance

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