Re: KVM and rtc missing interupts 2.6.21-rc3

[Lee Revell]

On 3/8/07, Roland Dreier <rdreier@xxxxxxxxx> wrote:
>  > 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.

Holding a lock too long should be easy to debug with the -rt patch -
set the preemption related options to match mainline, and enable the
latency tracer.

Lee
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/