forcedeth vs. nvnet driver for nVidia chipset

I'm working with a Mandriva 2005LE system that has a Gigabyte GA-K8NS
system board with the nForce3 250 chipset. The onboard ethernet adapter
is supported in the kernel by the "forcedeth" driver, which is marked
as "experimental."

Nvidia also offers their own driver, which I downloaded and installed.
(It would not build against the 2.6.12 kernel, complaining about
structure member "slot_name" not being present. It did compile against
the Mandriva 2.6.11 kernel.)

Anyone have any experience as to which driver is preferable in terms
of stability and performance? One quick test I did was to monitor
interrupts with vmstat, and was surprised to find that when copying a
large file over the network, the experimental kernel driver generated
about 1/2 the interrupts of the nVidia driver (~1800/sec vs. ~3700/sec).

--
Roger Blake
(Subtract 10 for email.)