Re: KVM and rtc missing interupts 2.6.21-rc3

From: Roland Dreier
Date: Thu Mar 08 2007 - 16:57:55 EST


> When ever I try and start a guest OS with kvm I get a lot of these rtc
> missing interupt messages from the kernel
>
> [ 468.510878] rtc: lost some interrupts at 1024Hz.

I started to debug this a little while ago but I never got too far.
However it doesn't seem connected with kvm -- it is something to do
with tun/tap or bridging holding a lock too long I think.

Try running your guest with -no-kvm (and even with the kvm module not
loaded, just to be sure). In my case I still saw the messages.
However, removing the "-net tap" line from my command line did get rid
of the messages.

- R.
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