On 01/19/2013 05:03 PM, Gilles Chanteperdrix wrote:
> On 01/19/2013 11:57 PM, John Morris wrote:
>
>> On 01/19/2013 04:52 PM, Gilles Chanteperdrix wrote:
>>> On 01/19/2013 11:50 PM, John Morris wrote:
>>>
>>>>
>>>>
>>>> On 01/19/2013 04:16 PM, Gilles Chanteperdrix wrote:
>>>>> On 01/19/2013 11:14 PM, Gilles Chanteperdrix wrote:
>>>>>
>>>>>> On 01/19/2013 11:12 PM, John Morris wrote:
>>>>>>
>>>>>>> On 01/19/2013 02:17 PM, John Morris wrote:
>>>>>>>> Hi list,
>>>>>>>>
>>>>>>>> These are the final tests on 32-bit before the initial RedHat packages
>>>>>>>> can be released for wider testing.
>>>>>>>>
>>>>>>>> On this host, a Dell Celeron with ICH5 chipset, the CLOCK_REALTIME
>>>>>>>> numbers look funny. All other tests run correctly.
>>>>>>>
>>>>>>> Whoops, how embarrassing, I reported the wrong thing: it's the
>>>>>>> native/tsc numbers that look funny.
>>>>>>>
>>>>>>> ++ /usr/lib/xenomai/regression/native/tsc
>>>>>>> Checking tsc for 1 minute(s)
>>>>>>> min: 4294967295, max: 0, avg: -nan
>>>>>>> min: 4294967295, max: 0, avg: -nan
>>>>>>> min: 4294967295, max: 0, avg: -nan
>>>>>>> min: 4294967295, max: 0, avg: -nan
>>>>>>> min: 4294967295, max: 0, avg: -nan
>>>>>>> min: 4294967295, max: 0, avg: -nan
>>>>>>> [...]
>>>>>>> min: 4294967295, max: 0, avg: -nan -> -nan us
>>>>>>
>>>>>>
>>>>>> You are probably missing --enable-x86-tsc on configure command line.
>>>>>>
>>>>>
>>>>> (or rather have passed --disable-x86-tsc as --enable-x86-tsc should be
>>>>> the default).
>>>>>
>>>>
>>>> --enable-x86-tsc is in there, and configure finds TSC support:
>>>>
>>>> + ./configure --build=i686-koji-linux-gnu --host=i686-koji-linux-gnu
>>>> --target=i686-redhat-linux-gnu --program-prefix= --prefix=/usr
>>>> --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
>>>> --sysconfdir=/etc --datadir=/usr/share
>>>> --includedir=/usr/include/xenomai/ --libdir=/usr/lib
>>>> --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib
>>>> --mandir=/usr/share/man --infodir=/usr/share/info --enable-x86-tsc
>>>> --enable-dlopen-skins --with-testdir=/usr/lib/xenomai
>>>> [...]
>>>> checking for x86 TSC support... y
>>>>
>>>> Build log follows. What else can I check?
>>>
>>>
>>> Could you send me the "tsc" program?
>>>
>>
>> http://www.zultron.com/static/2013/01/xenomai/3.5.7-test-32-bit/tsc.gz
>
>
> Ok, this program is compiled correctly, the error you have suggests that
> on your machine reading the tsc takes systematically more than 80
> cycles, a hardcoded value that is well, a bit too arbitrary.
An arbitrary extra zero, raising max dt to 800, confirms your explanation.
John
$ ./tsc
Checking tsc for 1 minute(s)
min: 99, max: 666, avg: 100.002
min: 99, max: 711, avg: 100.002
min: 99, max: 630, avg: 100.002
min: 99, max: 720, avg: 100.003
min: 99, max: 657, avg: 100.003
min: 99, max: 729, avg: 100.002
min: 99, max: 603, avg: 100.002
min: 99, max: 693, avg: 100.002
min: 99, max: 657, avg: 100.001
min: 99, max: 693, avg: 100.002
min: 99, max: 675, avg: 100.003
min: 99, max: 675, avg: 100.001
min: 99, max: 756, avg: 100.001
min: 99, max: 720, avg: 100
min: 99, max: 342, avg: 100
min: 99, max: 414, avg: 100
min: 99, max: 666, avg: 100
min: 99, max: 756, avg: 100
min: 99, max: 234, avg: 100
min: 99, max: 387, avg: 100
min: 99, max: 270, avg: 100
min: 99, max: 576, avg: 100
min: 99, max: 612, avg: 100
min: 99, max: 369, avg: 100.001
min: 99, max: 369, avg: 100
min: 99, max: 576, avg: 100
min: 99, max: 729, avg: 100
min: 99, max: 513, avg: 100
min: 99, max: 450, avg: 100
min: 99, max: 495, avg: 100
min: 99, max: 441, avg: 100
min: 99, max: 351, avg: 100
min: 99, max: 738, avg: 100
min: 99, max: 567, avg: 100
min: 99, max: 468, avg: 100
min: 99, max: 567, avg: 100
min: 99, max: 513, avg: 100
min: 99, max: 585, avg: 100
min: 99, max: 441, avg: 100
min: 99, max: 261, avg: 100
min: 99, max: 405, avg: 100
min: 99, max: 225, avg: 100
min: 99, max: 459, avg: 100
min: 99, max: 279, avg: 100
min: 99, max: 378, avg: 100
min: 99, max: 558, avg: 100
min: 99, max: 504, avg: 100
min: 99, max: 720, avg: 100
min: 99, max: 378, avg: 100
min: 99, max: 387, avg: 100
min: 99, max: 225, avg: 100
min: 99, max: 333, avg: 100
min: 99, max: 333, avg: 100
min: 99, max: 342, avg: 100
min: 99, max: 648, avg: 100
min: 99, max: 432, avg: 100
min: 99, max: 288, avg: 100
min: 99, max: 414, avg: 100
min: 99, max: 603, avg: 100
min: 99, max: 513, avg: 100
min: 99, max: 756, avg: 100 -> 0.0417693 us
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