RE: [Xen-devel] Serious performance issues

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

> Ian Pratt wrote:
> > Have you got some interrupt line going crazy?
> 
> That seems to be the problem.
> 
> In native linux, I see:
> 
> 0     timer   1000/s
> LOC           1000/s
> 
> and in xen dom0 I see:
> 
> 21    uhci_hcd        35000/s
> 130   timer           45000/s
> 
> rmmodding uhci_hcd removes irq 21, but makes the timer
> speed up to 115000/s.
> 
> rmmod ohci13943, rmmod ehci_hcd makes the timer go
> 800000/s.

Just to be clear, you're not using the usb virtualization stuff, just
accessing the device in domain 0?

Does anyone else see this interrupt storm with USB devices active?
Please can everyone check as I'll hold the 2.0.5 release (with USB
enabled in the default config) until we understand the scale of the
problem.  

Thanks,
Ian



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