I've added the CAM_NEW_TRAN_CODE kernel config option: http://leaf.dragonflybsd.org/mailarchive/commits/2007-12/msg00127.html
I've been running a kernel with this option (and some other patches) for a couple weeks now, and it makes one of my hdd's much happier. This probably won't work for all drivers, but over the next few weeks I hope to fix that. In the meantime, for those bleeding-edge testers out there, please provide any feedback on this. I've been using the ahd driver. --Peter
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