[xen-tools] Re: Argo's Host.pm: getRX and getTX values

[Steve Kemp]

On Sun, Nov 12, 2006 at 02:59:03PM -0500, Ward Vandewege wrote:

> So; it seems that the values Argo sends back for RX and TX are from the
> perspective of the dom0. This is because the getRX and getTX functions 
> get their info from /proc/net/dev/ in the dom0.

  Exactly.

> Now; the problem is that this is not very logical. When the 'info' or 'tx' or
> 'rx' functions are called, they get the domU's name as a parameter. A user
> would expect to get the numbers from the perspective of the domU, because
> she's asking for information about the domU, not the dom0.

  To be honest I'd agree.  The only downside with this approach is that
 it would require the argo-server to communicate in some way with the
 running instance, whether that was via a client software installation
 of some kind, or even just SSH keys and :

    ssh domU cat /proc/net ...


  I can't really regard either solution as being terribly attractive,
 but I think that there would be several advantages to mandating the
 installation of client software.  Especially for automated testing.

  (This is an example of why I stalled on the rewrite, because there
 are a lot of little issues like this that occurred to me after I'd
 started to put together the code.)

> I suggest we switch the RX and TX values so that they are returned in a more
> logical fashion. I'd be happy to submit a patch.
> What do you think?

  I think your suggestion is good.  I think that you raise a valid and
 obvious (now!) point.   Unfortunately given that the state of the CVS
 repository is .. broken .. I'm not going to be able to take a patch.

  My preferred solution is to start again, as explained in the previous
 mail, even though that does leave a lot of obvious bugs hanging.

  If you, or anybody else reading this, would be interested in
 discussing a design, or have input on the facilities and features that
 would be desirable please do let me know.

  I've been thinking about it on and off for a month or two now, and I'm
 getting to the point where I'm ready to start making design decisions..

Steve
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