RE: [Xen-devel] Serious performance issues

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

> Problem #1: plugging in my Logitech USB trackball creates an uhci_hcd
> and timer interrupt storm that degrades performance to about 10% of
> normal. Unplug does not stop storm. Unknown cause, not fixed, 
> workaround
> is not to plug in any USB device except hubs.

Could you try using some of the kernel profile stuff to figure out where
the time is being spent? 

> Problem #2: bridge setfd/sethello 0 causes timer interrupt storm, but
> does not degrade performance significantly. Workaround is to not set
> such low numbers. Will talk to brctl/bridging maintainers to make it
> more foolproof.

If you're starting a dialogue with the bridge folk, I'd be grateful if
you could bring up the issue of transferring IP addresses from
interfaces that are added to a bridge to the bridge.

Thanks,
Ian


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