On 24 July 2012 13:20, Luigi Rizzo <[email protected]> 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 ?
I suggest doing some digging to understand why. I bet we all know the answer, but it would be nice to have it documented and investigated. I bet em(4) isn't the only device that would benefit from this? 2c, Adrian _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[email protected]"
