[Xen-users] How to know the network limits?

[Jordi Espasa Clofent <jespasac@xxxxxxxxxxxx>]

Hi all,

In a physical standar machine, your network limit (in Mbps) depends on 
several factors (driver, data bus... etc) but one of the main items is 
the interruptions management. I'm wondering how Xen manages de 
interrupts, ¿every virtual NIC is trated as a physical NIC?
I've several dom0s with a domUs (paravirtualitzed)  with a lot of 
network activity as you can get with a busy SMTP server or 
load-balancer, for example. Monitoring with tools like munin I really 
see that these busy-networking domUs actually "eat" a lot of RX/TX kbps 
of physical NIC, but the question stills there ¿how to know the "limit"?
Normally your network limit is not established by network traffic (in 
Mbps): your network limit is established by the amount of packets which 
means a lot of interruptions. If you recive, for example, a lot af 
little packets you can get a minimal traffic and, on the other hand, a 
really busy NIC!
¿How to know the network limits (in interruptions load I mean)?

--
Thanks,
Jordi Espasa Clofent

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