[CentOS] 3Ware 9550SX and latency/system responsiveness

>>>> Is there any way to tell the card to forget about not having a BBU 
>>>> and behave as if it did?
>>> Short of modifying the code...I do not know of any.
>> Well, I've now got BBUs on order for the three identical machines to 
>> see if that does anything to improve matters - I'll report back when 
>> I've fitted them. A glance through the 2.26.05.007 driver code shows 
>> no references to the BBU, so the different code paths (with BBU and 
>> without) must be in the firmware itself.
> 
> If your card is on a PCI riser try running it plugged directly in the
> slot (if you can) and see if that helps.
> 

He said his card is directly plugged in.