linux-kernel - Re: KVM and rtc missing interupts 2.6.21-rc3

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Message-ID: <75b66ecd0703081721y75abccbet32a3c5de906132c8@mail.gmail.com>
Date:	Thu, 8 Mar 2007 20:21:42 -0500
From:	"Lee Revell" <rlrevell@...-job.com>
To:	"Roland Dreier" <rdreier@...co.com>
Cc:	"David Brown" <dmlb2000@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: KVM and rtc missing interupts 2.6.21-rc3

On 3/8/07, Roland Dreier <rdreier@...co.com> 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
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