Re: [Xen-devel] Xen cluster n/w performance (again!)

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> Another odd thing I saw is that, while on stock linux the 'timer' irq is rock
> steady at 100 interrupts per second,  under xen0 the timer irq varies
> from 60 to 200 when idle, and hits 5000 per second xen0 is receiving an
> iperf stream.

Domains don't get tick interrupts when they aren't running, so you can
see tick rates lower than native. Also, a domain gets a tick interrupt
every time it is rescheduled, which can happen at an arbitrarily fast
rate which explains your very high tick rates in some cases.

 -- Keir


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