What current Dell Systems are supported/work

Scott Long scottl at samsco.org
Thu Jan 17 08:27:26 PST 2008

Vivek Khera wrote:
> On Jan 15, 2008, at 1:40 PM, John Baldwin wrote:
>>> Where can one go to read up on what MSI is and how it helps us?
>>> Is enabling it just setting a sysctl?  Does that have to be done in
>>> loader.conf or can it happen later?
>> loader.conf (though it is now default on in RELENG_6).
>> hw.pci.msi_enable=1
>> hw.pci.msix_enable=1
> Thanks for the info.  But can anyone point me to some documentation on 
> why MSI is good for me?

When implemented and used correctly in the hardware and driver, it a
lower overhead interrupt mechanism.  It also expands the number of
interrupt vectors available, making interrupt sharing non-existent (for
right now, at least).  Thirdly, it vastly simplifies interrupt routing
and makes a lot of problems with missing interrupts at the OS/driver
level go away.


More information about the freebsd-stable mailing list