RE: [Xen-devel] Interrupt levels

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> > This can happen if you block/unblock very frequently. The timer 
> > interrupt from Xen isn't entirely tick-based -- you also 
> get a timer 
> > interrupt every time you are rescheduled.
> 
> By block/unblock I assume you mean context switching between different
> domains. Is this level normal? Is there a method to track down exactly
> is causing the block/unblocking?
> 
> > So the large number of timer interrupts indicates lots of 
> unblocking. 
> > Really we should hold-off the timer interrupt if the domain was 
> > descheduled for less than a jiffy. :-)
> 
> Is there a way to fix this at the moment?

Since processing timer interrupts are cheap there's no urgent fix
required.
The real question is why are you blocking/unblocking at a rate of
55k/second.

What are your domains doing? What interrupt rates do they see?

Ian


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