isp driver not 64 bit?
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Date: 11/30/04
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Date: Mon, 29 Nov 2004 20:05:39 -0500 To: freebsd-amd64@freebsd.org, freebsd-hackers@freebsd.org
After a bunch of frustrating debugging, I've tenatively come to the
conclusion that the isp(4) driver is not 64 bit safe --- at the very
least insofar as the amd64 platform is concerned.
The test setup was a quad opteron 248 system connected via two isp
2340 cards to switches which interconnect to an EMC^2 disk array.
I've made a couple of interim posts on this subject.
The message from scsi_da.c indicates the correct probe is received
from the disk. In the test, it was a 131 gig disk of 512 byte
sectors. However, by the time we get to cam_calc_geometry() in
cam.c, the structure is corrupt --- containing bad values for both
volume_size and sector_size.
The data is bogus enough at this point, that it can't be repaired
... and I gave up on the "quick fix" effort. Origionally, it
manifested as a divide by zero error (the block size was so huge, it
brought the denominator in the first few lines to zero). But both the
block_size and the volume_size are bogus making efforts by geom to
taste the last sector fail.
The isp driver is quite complex. I havn't encountered much of the
SCSI or CAM stack before. It would seem a brief overview of where
things go from the momment when scsi_da prints out the correct size to
the point at which cam_calc_geometry() receives corrupt data would
help greately.
Our hardware vendor is going to try to obtain test hardware for the
LSI logic HBA and an Adaptec HBA --- so we can test them. The test
machine remains somewhat available, but it looks like the production
machines will be linux (unless I can solve this problem this week).
Dave.
-- ============================================================================ |David Gilbert, Independent Contractor. | Two things can only be | |Mail: dave@daveg.ca | equal if and only if they | |http://daveg.ca | are precisely opposite. | =========================================================GLO================ _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
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