> > The 900Mbps are similar to what I see here on similar hardware.
>
> What kind of receive performance do you observe? I haven´t got that
> far yet.
> >
> > For your two-interface setup, are the 600Mbps aggregate send rate on
> > both interfaces, or do you see 600Mbps per interface? In the latter
>
> 600Mbps per interface. I´m going to try this out also on -CURRENT
> to see if it changes anything. Interrupts do not seem to pose a big
> problem because I´m seeing only a few thousand em interrupts
> a second but since every packet involves a write call there are >100k
> syscalls a second.
>
> > case, is your CPU maxed out? Only one can be in the kernel under
> > -stable, so the second one won't help much. With small packets like
> > that, you may be interrupt-bound. (Until Luigi releases polling for em
> > interfaces... :-)
> >
> I´ll try changing the packet sizes to figure out optimum.
>

Try my port of the netbsd kttcp kernel module.  You can find it at

http://www.freebsd.org/~sam

It will eliminate the system calls.  Don't recall if you said your system is
a dual-processor; I never tried it on SMP hardware.

    Sam


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