linux-kernel - Re: WARNING: Adjusting tsc more then 11%

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Message-ID: <4F6B7BAB.5050902@linaro.org>
Date:	Thu, 22 Mar 2012 12:21:15 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Sasha Levin <levinsasha928@...il.com>
CC:	Dave Jones <davej@...hat.com>,
	Fedora Kernel Team <kernel-team@...oraproject.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: WARNING: Adjusting tsc more then 11%

On 03/22/2012 12:11 PM, Sasha Levin wrote:
> On Wed, Mar 7, 2012 at 3:13 AM, John Stultz<john.stultz@...aro.org>  wrote:
>> On Mon, 2012-03-05 at 22:36 +0200, Sasha Levin wrote:
>>> On Mon, Mar 5, 2012 at 10:27 PM, John Stultz<john.stultz@...aro.org>  wrote:
>>>> On Mon, 2012-03-05 at 22:16 +0200, Sasha Levin wrote:
>>>>> On Mon, Mar 5, 2012 at 9:57 PM, Dave Jones<davej@...hat.com>  wrote:
>>>>>> On Mon, Mar 05, 2012 at 11:50:10AM -0800, John Stultz wrote:
>>>>>>
>>>>>>   >  So it would be great to get further feedback from folks who are seeing
>>>>>>   >  this warning, so we can really hammer this out, but I don't want the
>>>>>>   >  warning spooking anyone into thinking things are terribly broken.
>>>>>>
>>>>>> One of the reports was from someone using vbox. I'm now wondering if
>>>>>> the other users are using some other flavour of virt. I'll ask.
>>>>> I've reported this issue with regards to KVM before
>>>>> (http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/85632) but
>>>>> according to this thread it's not really KVM specific.
>>>>>
>>>>> It's easily reproducible using Dave's trinity running inside a KVM guest.
>>>> Great! Do you have a link to trinity? (Google just gives me a video of
>>>> its use and links to various churches)
>>> Sure, the git tree is here: codemonkey.org.uk/projects/trinity/trinity.git
>>>
>>> Basically just start 2*vcpu instances of trinity inside the guest and
>>> wait a bit.
>> So I left trinity running in a 2vcpu kvm guest for ~5 hours and haven't
>> seen anything yet. Could you send me a .config for the guest kernel and
>> maybe your kvm command line?
>>
>> Also, it shouldn't really matter, but are the guests 32bit or 64bit?
>>
>> thanks
>> -john
>>
>>
> Sorry, I missed this mail.
>
> You should start several trinity instances, probably 4-5 on a 2vcpu guest.
>
Ah. Sorry I misread the 2*vcpu as  "on a 2 vcpu instance".   Thanks for 
the clarification. Re-running tests now.

thanks
-john

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