linux-kernel - Re: Xen paravirt frontend block hang

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Message-ID: <47C71374.8010808@goop.org>
Date:	Thu, 28 Feb 2008 12:03:00 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	xming <xmingske@...il.com>
CC:	"Christopher S. Aker" <caker@...shore.net>,
	virtualization@...ts.linux-foundation.org,
	Keir Fraser <Keir.Fraser@...cam.ac.uk>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Xen paravirt frontend block hang

xming wrote:
> On Feb 7, 2008 5:09 AM, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>   
>> xming wrote:
>>     
>>> But I do have one problem after I upgraded to xen 3.2, the 2.6.23.x domU do
>>> not boot any more and 2.6.24 does boot but will hang after cpufreq changes
>>> the frequency.
>>>
>>>       
>> Interesting.  Do you mean dom0 cpufreq frequency changes will cause the
>> domU to hang?
>>
>>     J
>>
>>     
>
> Yes, when Dom0 changes freq while domU is doing something will trigger this.
> When using "on demand" will trigger this very eassily.
>
> This is from xm top when a domU hangs:
>
>     test32 ------       4018   98.8     131072    6.4     131072
> 6.4     1    1     4516    50087    1        0   433908   300403
> 3084907223
>
> So it appers to be running (eating CPU) sometimes the state is "r"
> sometimes "-",
> but both console and network are dead.
>   

I haven't tried to repro this yet, but I suspect I won't be able to 
because all my test machines have constant_tsc.  Does CPU change TSC 
rate on processor speed changes?

    J
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