RE: [Xen-users] Lots of udp (multicast) packet loss in domU

[Mike Kazmier <DaKaZ@xxxxxxxxx>]

On Tue, Jan 13, 2009 at 6:52 PM "Mike Kazmier" <DaKaZ@xxxxxxxxx> wrote:
>Thanks for the reply James, there are some comments below but let me start by 
>stating that indeed this problem is NOT solved.  When we removed the CPU cap 
>we only moved on to the NEXT problem.  Here is the issue now, we are still 
>getting massive packet loss (now upwards of 60%) and it appears the bridge is 
>culprit.  Again, we have approximately 600 Mbps of multicast (udp) traffic we 
>are trying to pass TO and then back FROM a domU, and then other domU's 
>occasionally grab and use this traffic.  Each domU that starts seems to 
>consume >80% cpu of the dom0 - but only if it is passed the bridged ethernet 
>ports.  So, maybe our architecture just isn't supported?  Should we be using a 
>routed configuration (with xorp for a multicast router?) and/or just use 
>PCI-Passthrough?  We don't see any such issues in PCI passthrough, but then 
>our domU's have to be connected via an external switch, and this is something 
>we were hoping to avoid.  Any advice here would be great.

According to  http://www.cs.ucl.ac.uk/staff/M.Handley/papers/xen-vrouters.pdf, 
we may be looking at only using the PCI-Passthrough model :(  They show 
extremely poor performance between the dom0 and domU.


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