Re: [Xen-users] XEN - Broadcom issue: survey

[Ivan Porro <pivan@xxxxxxxxxxxxx>]

Pasi Kärkkäinen wrote:
> On Wed, Nov 14, 2007 at 03:17:07PM +0000, Steven Smith wrote:
> > > this driver is the one relased by DELL on Nov. 11, and I have packet drop. 
> > > The same with driver 1.5.1c from broadcom
> > > The strange thing is that TX-DRP is 0 until I start a domain. Since I start 
> > > an HVM, TX-DRP for its vif start incresing.
> > > If I start an PV machine, it drop only 20 packets and then stop. No more 
> > > TX-DRP at all...
> > Yes, that's normal and expected behaviour.  If you try and send a
> > packet over a PV network interface to a domain which hasn't loaded the
> > PV network driver, the packet will be dropped and the TX-DRP statistic
> > will be incremented.  PV domains will therefore see a small number of
> > packets dropped at boot time, while HVM domains will see ongoing
> > packet drop for as long as the domain remains alive.  For an HVM
> > domain, you probably want to look at the tap device rather than the
> > vif.
> Steps to go through to debug:
>
> 1. Make sure networking is OK in the host, without running xen at all
> (just running the normal non-xen kernel).
>
> 2. Make sure networking is OK on dom0, when running xen-kernel and NO domU
>    running. 
>
> 3. Make sure networking is OK on paravirt domU.
>
> 4. Make sure networking is OK on HVM domU, make sure you're running 
>    paravirt drivers on HVM domU (this is important!!). Without PV drivers
>    performance of HVM domU will be sucky and you WILL get packet drops.
>
> Now, with those tests done, you should be able to isolate the problem quite
> easily.. and see if it's NIC/driver or Xen or domU driver related.
>
> -- Pasi 
0. RTFM....I think that the user has raised an error and will be 
terminated (MySelf :))
thank you for help and for pointing this out (you and Steven), I'll 
investigate further for my "RDP intermittent session" problem
ivan




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