Re: [Xen-devel] Latest unstable detects cpu speed incorrectly

["Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>]

My Intel Pentium Dual Core E6300 @ 2.8 GHz seems to outperform AMD
Phenom II 550be clocked at 3.6 GHz.

http://forums.hardwarezone.com.sg/showthread.php?t=2527603&page=12

I did not set tsc_native=1 in my Windows XP HVM config. Should I set it?

-- 
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
Blog URL: http://teo-en-ming-aka-zhang-enming.blogspot.com
Email: space.time.universe@xxxxxxxxx
MSN: teoenming@xxxxxxxxxxx
Mobile Phone: +65-9648-9798
Street: Bedok Reservoir Road
Republic of Singapore



On Wed, Oct 28, 2009 at 12:18 AM, Mr. Teo En Ming (Zhang Enming)
<space.time.universe@xxxxxxxxx> wrote:
> I am also experiencing 1000 MHz in my Windows XP HVM domU.
>
> Check out my video here:
>
> http://www.youtube.com/watch?v=3mxuNRiMxDU
>
> --
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> Blog URL: http://teo-en-ming-aka-zhang-enming.blogspot.com
> Email: space.time.universe@xxxxxxxxx
> MSN: teoenming@xxxxxxxxxxx
> Mobile Phone: +65-9648-9798
> Street: Bedok Reservoir Road
> Republic of Singapore
>
>
>
> On Wed, Oct 28, 2009 at 12:12 AM, Valtteri Kiviniemi
> <valtteri.kiviniemi@xxxxxxxxxxxx> wrote:
>> Hi,
>>
>> I have to wait for that to occur again. There were no error messages,
>> suddenly domU's with emulated TSC started to use a lot of CPU until they
>> were so slow that they had to be destroyed. domU's with native tsc are
>> working fine.
>>
>> Is there any way to track down the problem?
>>
>> - Valtteri Kiviniemi
>>
>> Keir Fraser kirjoitti:
>>>
>>> Haven't heard any other reports of that. Can you provide more details?
>>>
>>>  -- Keir
>>>
>>> On 27/10/2009 15:51, "Valtteri Kiviniemi"
>>> <valtteri.kiviniemi@xxxxxxxxxxxx>
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> Seems like that emulation is not quite working as it should be. domU's
>>>> are using all the available cpu and then they crash. I did a fallback
>>>> back to the old behaviour and the virtuals running with tsc_native=1 are
>>>> working fine.
>>>>
>>>> - Valtteri Kiviniemi
>>>>
>>>> Valtteri Kiviniemi kirjoitti:
>>>>>
>>>>> Hi,
>>>>>
>>>>> Ok, good to know. Is it always at 1GHz or can it be adjusted? Is there
>>>>> some other new features different from 3.4.1 that I should know?
>>>>>
>>>>>
>>>>> - Valtteri Kiviniemi
>>>>>
>>>>> Keir Fraser kirjoitti:
>>>>>>
>>>>>> On 27/10/2009 15:22, "Valtteri Kiviniemi"
>>>>>> <valtteri.kiviniemi@xxxxxxxxxxxx>
>>>>>> wrote:
>>>>>>
>>>>>>> We are testing the latest xen-unstable and found an interesting bug.
>>>>>>> dom0 detects cpu speed correctly but when booting domU it detects it
>>>>>>> incorrectly:
>>>>>>>
>>>>>>> "Detected 1000.000 MHz processor."
>>>>>>
>>>>>> TSC is emulated at that speed. If you want old behaviour then add
>>>>>> tsc_native=1
>>>>>> to your domain config file.
>>>>>>
>>>>>>  -- Keir
>>>>>>
>>>>>>
>>>>>>
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>>>>
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>>>
>>>
>>
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>

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