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

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Message-ID: <adatzwvxuta.fsf@cisco.com>
Date:	Thu, 08 Mar 2007 13:57:21 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	"David Brown" <dmlb2000@...il.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: KVM and rtc missing interupts 2.6.21-rc3

 > 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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