Intel 82574L (em)

[Sean Bruno]

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On 02/02/15 08:42, Pieper, Jeffrey E wrote:
> Iirc, we experienced issues with 82574L, where the interface will
> hang/die. This is resolved in both FreeBSD and Linux by forcing
> ASPM off and disabling MSIX.
> 
> Jeff
> 
> 

Are you running tests with the multi-queue implementation in the h/w
and driver turned on?

sean

> ----Original Message----- From: owner-freebsd-net at freebsd.org
> [mailto:owner-freebsd-net at freebsd.org] On Behalf Of Jack Vogel 
> Sent: Friday, January 30, 2015 8:30 PM To: hiren panchasara Cc:
> FreeBSD Net Subject: Re: Intel 82574L (em)
> 
> Yup, I wrote that :)
> 
> Sean, I will check around to see if anything may have changed in
> that regard.
> 
> Jack
> 
> 
> On Fri, Jan 30, 2015 at 5:00 PM, hiren panchasara < 
> hiren at strugglingcoder.info> wrote:
> 
>> On Fri, Jan 30, 2015 at 01:11:50PM -0800, Sean Bruno wrote:
>>> 
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>>> 
>> http://www.intel.com/content/dam/doc/datasheet/82574l-gbe-controller-datasheet.pdf
>>>
>>>
>> 
According to 7.1.11, this device does indeed have 2 queues for stuff and
>>> or things.  So, basic RSS would be possible in something like
>>> an Atom
>> box.
>>> 
>>> I note that the em(4) driver intentionally disables this on 
>>> initialization.  I'm up for some science on my new shiny, soon
>>> to be router box. Any reason not to default to 1 queue and
>>> allow loader.conf to raise it to 2?
>> 
>> Intel folks know better but it seems this is hartwell.
>> 
>> em_setup_msix() in very start says:
>> 
>> /* ** Setup MSI/X for Hartwell: tests have shown ** use of two
>> queues to be unstable, and to ** provide no great gain anyway, so
>> we simply ** seperate the interrupts and use a single queue. */
>> 
>> Things may have changed now. I guess you can try enabling it and
>> find out :-)
>> 
>> cheers, Hiren
>> 
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