Re: [Xen-users] Network dies when downloading on dom0

To:	"Pepe Barbe" <elventear@xxxxxxxxx>
Subject:	Re: [Xen-users] Network dies when downloading on dom0
From:	"Chris Holland" <rangerco1@xxxxxxxxx>
Date:	Tue, 26 Aug 2008 13:07:47 -0600
Cc:	Stephan Seitz <s.seitz@xxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx, Daniel Kühl <dklima@xxxxxxxxx>
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What kinds of speed restrictions are needed to keep things going? My internet connection is 10Mbit/s with 40Mbit/s burst speed and I don't want to loose that speed.

Thanks
Chris

On Tue, Aug 26, 2008 at 11:40 AM, Pepe Barbe <elventear@xxxxxxxxx> wrote:

On Aug 26, 2008, at 10:21 AM, Stephan Seitz wrote:

just passing by this thread, I'ld suggest setting tx off on both dom0
and domU.

I always did it on domUs. I tried on dom0 and it improved things marginally. The network holds longer for high traffic but the delay still manages to increase from 80 ms up to 1000ms. Usually after that it just dies.

Another problem I noticed sometimes on a few platforms on high dom0
traffic are missing interrupts. On SMP machines I could always solve
this by installing irqbalance inside dom0.

I tried this, but didn't help either. Similar behavior as before. What can I do to see if I am missing interrupts?

The only thing that manages to keep our ping delay times constant about 120ms (Which is the primary symptom of the network about to die) is to cap the traffic in our domU router.

Something interesting I noticed, is that I tried to limit the speed of the VIF between the router and the dom0 and it didn't help. Only limiting the speed on the WAN interface which is Physical interface hidden from the dom0 and added to the domU. Could there be some issue because it is not a Virtual Interface? A driver problem perhaps?

Thanks,
Pepe

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Re: [Xen-users] Network dies when downloading on dom0