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Re: FIXED: mpt Serious performance issues
On Wed, 9 Feb 2011, Michael L. Hitch wrote:
That would be because both FreeBSD and OpenBSD have totally rewritten their
driver. It did not appear that either driver clears the SCSI DEVICE page.
Started looking through the FreeBSD driver, and they do reset the SCSI
DEVICE pages - but only if the BIOS has not negotiated target speeds.
Since the BIOS will usually have done all that during the controller
initialization, the FreeBSD driver would normally not touch those pages.
Although I do see where it will update the page individually, but I'm not
sure what conditions that would occur on. I would hope that it's only if
the driver is using the physical drives directly. [It looks like it's
likely done in the CAM layer somewhere.]
Michael L. Hitch mhitch%montana.edu@localhost
Information Technology Center
Montana State University Bozeman, MT USA
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