HEADS UP: Major CAM performance regression

[Ivan Voras]

Scott Long wrote:

> I have committed a fix for this problem for FreeBSD 8-CURRENT as of SVN
> revision 188570. FreeBSD 7-STABLE will be updated with the fix in a few
> days once I've gotten confirmation that the fix works and doesn't cause
> any adverse side-effects.  Anyone wanting to help in this validation
> effort should apply the attached patch to their kernel source tree and
> recompile.  Please contact me directly by email to report if the problem
> is fixed for you.

I notice that write performance on an ESXi 3.5 hosted system is doubled,
but read performance remains the same (in bonnie++).
On a CISS system there is no significant change.

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