[vortex] 3c905C for a linux router

[Ralph Doncaster]

> > I'm planning to rebuild the driver with rx_copybreak=0 to try to improve
> > the performance with smaller packets.  The other thing I'd like to be able
> > to do is rx interrupt mitigation like the Tulip 21143.   The driver only
> > seems to support tx interrupt mitigation though.  Is there another driver
> > I can use?
> 
> The 21143 interrupt mitigation is a hardware feature.
> 
> Deferring Rx interrupts requires hardware support.  While it's possible
> to change the Rx interrupt setting to only interrupt with every second
> or third packet, low rate traffic (imagine 'ping') will be unacceptably
> delayed.

Low rate traffic for this box would be >10mbps, so 1 interrupt ever 5-10
packets would be fine with me.  If it's only a couple lines to change in
the source I'd be willing to try it out.

-Ralph