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RE: [Xen-devel] Serious performance issues

To: "Tommi Virtanen" <tv@xxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Serious performance issues
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Mon, 7 Mar 2005 09:47:14 -0000
Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxxx>, <ian.pratt@xxxxxxxxxxxx>, <ian.pratt@xxxxxxxxxxxx>
Delivery-date: Mon, 07 Mar 2005 09:48:44 +0000
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Thread-index: AcUi93EYBM9Fv5iPTP+YuIQB0Rdd+gAApuIw
Thread-topic: [Xen-devel] Serious performance issues
> 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.


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