Re: High packet loss in netbsd-5.0 domU

[Anup Patil <anupp%gmx.net@localhost>]

On Sat, 2009-04-25 at 17:58 +1000, Sarton O'Brien wrote:
> On 23/04/2009 8:51 PM, Anup Patil wrote:
> > On Tue, 2009-04-21 at 21:59 +0200, Manuel Bouyer wrote:
>  >>
> >> What network test ? who is sending the datagram and who is receiving them ?
> >> Did you check that the dom0 can handle the network load ? What OS is
> >> the dom0 running ?
> >>
> >
> > Dom0 is linux-2.6.18.8, built from the xen sources.
> > The sender and receiver is iperf
> > ( http://sourceforge.net/projects/iperf/)
> >
> > Receiver is  connected to the dom0 by a 100 Mb/s switch, and cpu load in
> > dom0 seems to be all right as other domU's (linux 2.18.8 ) perform
> > differently.
> 
> So the scenario is a NetBSD domu sending out via a linux dom0 bridge? 
> Receiver is _another box_ connected via 100Mbps?
> 
> And the linux domu operate faultlessly with this test? That would be a 
> crucial piece of info to isolate the issue.
> 
> Have you performed the same test from dom0?
> 
> It's highly possible it's how NetBSD operates under a linux dom0 but 
> more specific info is needed. Have you tried current? It's possible it's 
> been fixed and if it has, this would be a definitive test.
> 
> This is something I'm sure they'd like to fix in 5-RC if it's not 
> working, especially if it's already been fixed :) ... A release with 
> incompatible domu kernels for the current supported version of xen isn't 
> ideal.
> 
> Sarton

This is exactly what i did. I tested with the current (5.0_RC4 NetBSD
5.0_RC4 (XEN3PAE_DOMU) ) version too and saw the same problems.

The tests from dom0 and domu (linux-2.18.8) do not have this problem 


--anup