linux-kernel - Re: KVM: Softlockups in guests while running kernbench

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Message-ID: <4FAB88B8.5060203@redhat.com>
Date:	Thu, 10 May 2012 12:22:00 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
CC:	Andrea Arcangeli <aarcange@...hat.com>, KVM <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: KVM: Softlockups in guests while running kernbench

On 05/10/2012 11:15 AM, Nikunj A Dadhania wrote:
> I am running a 3.4.0-rc4 based kernel(commit: af3a3ab2), guest config
> attached.
>
> During my tests, I saw few softlockups inside the guests while running
> kernbench inside the guest. I can reproduce this repeatedly.
>
> Test Setup:
>
> - Create 4 VMs (8vcpu, 1GB RAM)
> - Run kernbench inside each guests (kernbench -f -M -H -o 16) in parallel
>
>

How overcommitted are you?  What does the host hardware look like?  Is
there any load on the host?

The traces themselves always point a couple of instructions after
interrupts are enabled.  Can you post a few more?

-- 
error compiling committee.c: too many arguments to function

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