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Re: [libvirt] [PATCH 0/7] Add support for setting QoS



On 24.06.2011 20:00, Christian Benvenuti (benve) wrote:
>>> 3) Similarly for macvtap <network>s, will the network-wide bandwidth
>>> limiting be applied to the physical ethernet device? This would
>>> have the side effect of including host traffic on that interface in
>>> the bandwidth totals, but I don't see a way around it.
>> With this patch as-is, shaping rules are applied only when creating
> TAP
>> devices. This mean only network types VIR_DOMAIN_NET_TYPE_NETWORK and
>> VIR_DOMAIN_NET_TYPE_BRIDGE.
>>>
>>> 4) Finally on that topic, what about <network>s that have a pool of
>>> physical ethernets to be used macvtap-style? Is there any way we can
>>> do bandwidth limiting on an aggregated collection of network
> interfaces?
>>> Or
>>> will attempts to configure this necessarily result in a "config not
>>> supported" log message?
>> Huh, I didn't know it is possible to have a pool of devices within one
>> <network>. So in this case, this patch silently does nothing.
> 
> The IFB (Intermediate Functional Block) allows you to
> configure aggregate QoS on multiple interfaces.
> 
> /Chris
> 
> 
Yes, but we would then need to create those IFB devices on the fly (e.g.
on domain startup) and I don't think there is other way than unloading
and then loading the ifb module (with different parameter) which however
would break other domains connections. Or am I missing something?

But I agree, using ifb would be much more beautiful, because we could
actually shape incoming traffic instead of dropping.

Michal


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