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.

Scott


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