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Date:      Thu, 17 Jan 2008 09:25:51 -0700
From:      Scott Long <scottl@samsco.org>
To:        Vivek Khera <vivek@khera.org>
Cc:        FreeBSD Stable List <freebsd-stable@freebsd.org>
Subject:   Re: What current Dell Systems are supported/work
Message-ID:  <478F818F.9020209@samsco.org>
In-Reply-To: <1608FD4D-72C2-4C16-890A-6ABA8FB20E57@khera.org>
References:  <DB4DDB04-1ADE-4C36-A846-BB6B7C12EB1B@patmedia.net>	<200801101109.38294.jhb@freebsd.org>	<70AABDAF-1925-4DBE-88A2-976CFBC55C5E@khera.org>	<200801151340.46771.jhb@freebsd.org> <1608FD4D-72C2-4C16-890A-6ABA8FB20E57@khera.org>

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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).

Scott



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