svn commit: r238765 - head/sys/dev/e1000
John Baldwin
jhb at freebsd.org
Mon Jul 30 20:08:10 UTC 2012
On Wednesday, July 25, 2012 7:28:15 am Luigi Rizzo wrote:
> Author: luigi
> Date: Wed Jul 25 11:28:15 2012
> New Revision: 238765
> URL: http://svn.freebsd.org/changeset/base/238765
>
> Log:
> Use legacy interrupts as a default. This gives up to 10% speedup
> when used in qemu (and this driver is for non-PCIe cards,
> so probably its largest use is in virtualized environments).
>
> Approved by: Jack Vogel
> MFC after: 3 days
Why not make this a tunable or some such? You could even have it only use the
legacy handler under qemu easily enough. There's no reason this has to be a
compile-time option. This is almost certainly slower on real hardware where
this is important to work around dubious Intel Host-PCI bridges that result in
aliased USB interrupts for every em(4) interrupt.
--
John Baldwin
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