RFC: use EM_LEGACY_IRQ in if_lem.c ?

[Andrew Boyer]

lem is also used under VMware.  Performance and stability should be tested there, too, before this change.

-Andrew

On Jul 24, 2012, at 4:20 PM, Luigi Rizzo wrote:

> if_lem.c ("lem", one of the e1000 drivers) has 2 possible interrupt modes:
> EM_LEGACY_IRQ uses the standard dispatch mechanism, whereas
> FAST_INTR has a custom handler that signals a taskqueue to do the job.
> 
> I have no idea which actual hardware uses it (all of my Intel 1G
> cards use either "em" or "igb"), but "lem" is the driver used in
> qemu, and there the EM_LEGACY_IRQ gives approx 10% higher packet
> rates than the other.
> 
> Any objections if i change the default to EM_LEGACY_IRQ ?
> 
> 	cheers
> 	luigi
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Andrew Boyer	aboyer at averesystems.com