Isoch resources problem x64 win7 1394 bus driver

I developed a firewire camera (x64 bit) driver for my image device, the
driver can run with SONY industrial camera (IIDC 1.30) on FireWire S800, 60
fps on 640x480 on windows 7 x64, but failed on my image device, the x86
version of this driver works well on x86 platform, both on winxp and win7.

The error code returned from win7 x64 was
0xc000009a(STATUS_INSUFFICIENT_RESOURCES), when submit
REQUEST_ISOCH_ALLOCATE_RESOURCES isoch request calling to 1394 bus driver, I
check the difference of running info between Sony device and my device, only
isoch packet size is difference, my device is bigger than 4k, sony is smaller
than 4k, but they both work well on x86 platform, is there some differences
for isoch packet for win7 x64? thanks for any helps.

--
Steven