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Date: Tue, 24 Jul 2012 15:07:52 -0700
Message-ID: <CAFOYbcnETntWY+ESPB8x0BRF7Uqc7XG=EOurY5axFEkm1dwVBw@mail.gmail.com>
From: Jack Vogel <jfvogel@gmail.com>
To: Luigi Rizzo <rizzo@iet.unipi.it>
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Cc: current@freebsd.org
Subject: Re: RFC: use EM_LEGACY_IRQ in if_lem.c ?
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Interesting, lem is all the non-pcie hardware, and if you see better
performance
out of the LEGACY path then I'm OK with changing the default.

Jack


On Tue, Jul 24, 2012 at 1:20 PM, Luigi Rizzo <rizzo@iet.unipi.it> 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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