Re: [Xen-users] Domain context switch time

[Randy Thelen <rthelen@xxxxxxxxxx>]

sriram govindan wrote:

> When a network interrupt comes to the hyperviser, is it possible to  
> find the domain the packet is intended to? (in the hyperviser  
> itself, that is to read the destination IP address of the packet)
Doing this would violate the simple design of the hypervisor which  
currently doesn't have device drivers of this sort (really, of any  
sort ;-).
However, users always demand more performance out of their existing  
hardware and such architectural violations are not uncommon.  Because  
Xen is open source, it is certainly the case that you or someone  
could add such support into the Xen source code.  And, because of the  
GPL you (or they) would be required to make their source available  
(i.e., it's illegal to benefit privately) even if the modification  
were not accepted into the Xen source tree.
One of the problems with injecting enough device smarts into Xen to  
perform this operation is that it's one more moving part that could  
contain a bug and take down the entire system.  Personally, I'm in  
favor of the slower, more reliable Xen than the faster, less reliable  
version.  :-)
-- Randy

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