SBP 1394 hard drives hang with Windows XP (rare)
PJohansson at acm.org
Fri May 2 10:16:54 PDT 2003
* From the T10 Reflector (t10 at t10.org), posted by:
* Peter Johansson <PJohansson at ACM.org>
At 07:48 AM 5/2/2003 -0700, Mike Berhan wrote:
>Is it an I/O larger than 64K that has an issue? 128K? 256K? Some
Mike, since I don't know the internals of Microsoft's SBP driver, this is
mere speculation---but it COULD be a software problem. Given a 512-byte
logical block size, the largest data transfer that may be made WITHOUT
recourse to a page table is 65,024 bytes (just a block shy of 64 KiB). Of
course, arbitrarily large data transfers maybe described by using a page
table. But if the data is contiguous in memory and wouldn't otherwise
require a page table, perhaps there's a loophole in the driver?
As I said, this is just speculation on my part. I hope you get a more
useful answer from Microsoft or some of the bridge chip vendors.
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PJohansson at ACM.org
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