FireWire slows from 60MB/s to 16MB/s when switching from Tiger to Leopard

Hi Folks
This is a big problem for FCP users so I'm posting this here (as well as on the Leopard discussion board). After upgrading to Leopard I noticed a substantial drop in FireWire disk performance. While in Tiger I could sustain 60MB/s against a FireWire800 RAID0 drive. After doing a clean install of Leopard the same drive wouldn't go past 16MB/s reading and about 30MB/s writing.
Note that I'm well aware of the usual suspects - Spotlight, Time Machine, some other process hitting the disk. This is NOT what's going on.
I can boot back and forth between Tiger and Leopard and see the above-mentioned speed change. I even went to the Apple Store and booted my machine off of their vanilla installs of both OSes and verified the problem.
Turns out the specific version of the MacBook Pro is important here. The latest refresh does NOT repro the problem. However, my version, MacBookPro2,2 the first refresh (which was the first to have a FW800 port) DOES repro the problem.
I've tried this with various Oxford-based FireWire drives and seen the same behavior. Anyone else have this version of the MacBook Pro willing to try this and post their results? You could use most any benchmark program to test throughput - Xbench is fine and free - but I've been using this one (free as well and one-button easy):
http://www.aja.com/ajashare/AJAKONA_System_Testv2.app.tar
Thanks and let's hope Apple fixes this one quickly!

You might consider getting a firewire 800 card and see if that helps. Maybe they'd let you try one out at the apple store. Never a bad idea to have a second firewire bus anyway.
Or even better, get a SATA card and some external sata drives (I've got both a firewire800 and sata card for my macbookpro - but I've got the earlier model that only has firewire 400 internally). btw, I'm still on tiger.
Message was edited by: Michael Grenadier

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