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From Bryan Whitehead <dri...@megahappy.net>
Subject Re: Router VM peaks at ~920 Mbit/s instad of 4000 Mbit/s network offering rate limit
Date Tue, 04 Dec 2012 19:11:38 GMT
What is network.throttling.rate and vm.network.throttling.rate set to in
global settings?

Please correct me if I'm wrong about how these global settings work, but I
think these values override the templates.


On Tue, Dec 4, 2012 at 2:58 AM, Wolfram Schlich
<lists@wolfram.schlich.org>wrote:

> Hi!
>
> Does a router VM have another kind of network rate
> limitation besides the one from the network offering?
>
> We have the network offering set to 4000 Mbit/s
> which is resembled by XenServer through limiting
> the interface bandwidth to 500MByte/s (checked that).
>
> With unrouted traffic within a CloudStack network
> (between instances running on different nodes that
> all have 10 GbE links), the instances peak at the
> configured 4000 Mbit/s (so, as expected). When
> doing routed traffic between different CloudStack
> networks (passing 2 router VMs), the same test peaks
> at around ~920 Mbit/s while the router VM CPU shows
> to idle about 99% (25k interrupts/s).
>
> The instances used for testing as well as the router
> VMs run on Citrix XenServer 6.0.2 and are all using
> xen_netfront as the virtual ethernet driver (which
> does not even supply a speed value to the VM).
>
> I've also looked for any kind of tc/iptables rules
> on the router VM but couldn't find any that seem
> relevant for this issue.
>
> Ideas, anyone? :-)
>
> Cheers,
> Wolfram
>

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