On Fri, 18 Oct 2002, Petri Helenius wrote:
> >
> > just reading the source code, yes, it appears that the card has
> > support for delayed rx/tx interrupts -- see RIDV and TIDV definitions
> > and usage in sys/dev/em/* . I don't know in what units are the values
> > (28 and 128, respectively), but it does appear that tx interrupts are
> > delayed a bit more than rx interrupts.
> >
> The thing what is looking suspect is also the "small packet interrupt" feature
> which does not seem to get modified in the em driver but is on the defines.
>
> If that would be on by default, weŽd probably see interrupts "too often"
> because it tries to optimize interrupts for good throughput on small number
> of TCP streams.
>
Hmm. Might that explain the abysmal performance of the em driver with
packets smaller than 333 bytes?
Kelly
--
Kelly Yancey -- kbyanc@{posi.net,FreeBSD.org}
FreeBSD, The Power To Serve: http://www.freebsd.org/
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