HEADS UP: Major CAM performance regression

[Mike Tancsa]

At 11:56 AM 3/3/2009, Barry Pederson wrote:

>I can report a "metoo" on a 7.0-RELEASE-p3 machine with an Areca 
>ARC-1212 card and SATA drives.  "camcontrol tags da0" reports:
>
>         (pass0:arcmsr0:0:0:0): device openings: 1
>
>The machine is just a dog sometimes.  Haven't tried the patch though.


RELENG_7 has all the fixes in.  There seem to be quite a few cam 
fixes plus the one areca fix.  With the patches, post reboot I now see

da1: Command Queueing Enabled

raw throughput seems to be the same (which is should). It when there 
are multiple reads/writes that the biggest difference should show up.

         ---Mike