From owner-freebsd-drivers@FreeBSD.ORG  Tue Feb 15 16:57:27 2011
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Date: Tue, 15 Feb 2011 08:57:27 -0800 (PST)
From: Erich Weiler <weiler@soe.ucsc.edu>
To: John Baldwin <jhb@freebsd.org>
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Cc: freebsd-drivers@freebsd.org
Subject: Re: MFI Driver Behavior
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> > But would I lose anything by disabling MSI? I'm still not exactly
> > sure
> > what it does, even after googling a bit... ;) Is there a man page I
> > can look at?
> 
> Hrmph. It looks like our in-tree mfi(4) driver does not support MSI
> after
> all. How odd. I know the hardware supports MSI. In that case, this
> test
> won't help. :(

We are testing a new theory.  We believe that the C-states and C1E control on this chipset (in the Dell R610), which are configurable in the BIOS, are affecting the controller in some way.  We are disabling them and trying again.  I'll post results soon.