Re: [Xen-users] External modem in domU

[Ryan <hap9@xxxxxxxxxxxxxx>]

On Tue, 2006-02-21 at 16:29 -0500, Javier Guerra wrote:
> On Tuesday 21 February 2006 3:59 pm, Ryan wrote:
> > I'm curious, are others interested in driver domains for legacy devices
> > (like serial ports, ps/2 ports, ISA cards)? What other kinds of
> > devices/buses need to be supported with driver domains?
> 
> now that you mention...
> 
> the recent problems about low performance NFS between two domU's, and the 
> usual "turn off checksum offloading" advice makes me wonder if ethernet-level 
> virtual networking might not always be the best option.
> 
> what about a tap-based paravirtualized driver? (instead of the current 
> tun-based one)  would that be faster for inter-domU's networking?
> 

I don't believe that the current Xen netfront driver uses either the tun
or tap interfaces. Those exist to allow userspace applications to
interact with the network stack. I can't claim to be an expert on the
internals of the networking driver, but I believe it registers as an
ethernet driver and all the work of transferring packets through
shared/transferred pages is done in-kernel.

Ryan


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