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Re: [Xen-users] [SOLVED] domU PXE boot with bridge

  • To: xen-users@xxxxxxxxxxxxx
  • From: "Raj Mathur (ààà ààààà)" <raju@xxxxxxxxxxxxxxx>
  • Date: Mon, 13 Aug 2012 22:19:36 +0530
  • Delivery-date: Mon, 13 Aug 2012 16:52:15 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

On Monday 13 Aug 2012, Alexandre Kouznetsov wrote:
> Hello.
> El 11/08/12 22:48, Raj Mathur (ààà ààààà) escribiÃ:
> > Is there a better way, e.g. by somehow forcing gPXE to sleep for
> > some time before it tries the DHCP?
> > 
> > In any case, now our automated Debian install is working for
> > bridged domU VMs.  Hope this is useful to others with the same
> > problem.
> By default, at least in Debian, when you attach a network interface
> (vif, in this case) to a bridge, there is delay before the packets
> are forwarded to the newly attached interface. The delay time is
> configurable via interfaces file or brctl utility.

Thanks for that information.  That is exactly the problem we were 

In our case, the delay was no trouble except when we needed to PXE boot 
to install.  After install, we boot the VM with the normal kernel= and 
root= parameters, and bridge forward delays aren't noticeable.

Two further questions arise:

1. Presumably the bridge forward delay is there for a purpose.  Can 
reducing that value result in other problems?

2. Is it possible to get the current value of the forward delay from a 
bridge?  If we can do that, we can script a reduced delay when PXE 
booting and installing a VM, then go back to the default delay after the 
VM install is over.


-- Raj
Raj Mathur                          || raju@xxxxxxxxxxxxx   || GPG:
http://otheronepercent.blogspot.com || http://kandalaya.org || CC68
It is the mind that moves           || http://schizoid.in   || D17F

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