On Tue, Oct 11, 2011 at 08:10:01PM -0700, Josh Triplett wrote:
> I tested the new Atom flight computer (the PCM-3363N) with BITS
> (http://biosbits.org/) to check for x86 System Management Interrupts
> (SMIs) which could break our latency and jitter budgets.  I found that
> the board has an SMI about 4 times per second, which takes anywhere from
> 500us to 1500us.  I submitted a support request to the manufacturer
> trying to find out how we can disable this, or failing that asking for a
> fix.  Meanwhile, I'll try adjusting various BIOS settings to see if I
> can make it go away.

I just confirmed that the SMIs do not go away if I boot from CF and
avoid USB keyboards and USB boot disks (which normally cause SMIs when
accessed via BIOS services).

- Josh Triplett

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