here the output of a simple test in php (using ownet.php) via owserver on
debian nslu2 owfs 2.8p3 and busmaster is 2482-800
reading pio is ~50ms
reading temperature is ~770ms
reading cached temp (frm owfs memory) is 15ms
measuring timming for temperature and pio
> connect to ownet duration=3ms
> temperature for /bus.0/uncached/28.0521AD010000/temperature =
> 17.6875 duration=771ms
> waiting 5s duration=5006ms
> set /bus.0/12.5B1E6D000000/PIO.B=1 duration=118ms
> read /uncached/bus.0/12.5B1E6D000000/sensed.B=0 duration=49ms
> set /bus.0/12.5B1E6D000000/PIO.B=0 duration=85ms
> read /uncached/bus.0/12.5B1E6D000000/sensed.B=1 duration=46ms
> waiting 1s duration=1002ms
> temperature for /bus.0/28.0521AD010000/temperature =
> 17.6875 duration=15ms
> done
>
>
2011/2/3 Roman Jałoza <r.jal...@a2s.pl>
> How looks your timings? How fast can you read temperature or PIO?
> Are these timings are similar to my? (650ms to PIO and 1-1,2 s for temp
> without converT command )
>
> Roman
>
> W dniu 03.02.2011 21:44, Pascal Baerten pisze:
>
> Hi Roman,
>
>
> I'm using owfs with ds2482-800 and found the communication slower than
> other bus masters solutions.
> However not that slow than you describe.
>
> Analysing 1-Wire communication with a digital scope shown that an idle
> period is visible between each byte and "tri-bits".
> This idle period is around 1,3ms for my system (nslu2 with debian), this
> reduce the effective throughput to 4kbit/s instead of 15kbit/s.
>
> Do you have an hadware assited i2c controller embedded or are you using
> software i2c?
> I think that my behaviour come from software i2c that does not buffer
> transactions and require attention from owfs between each byte and tri-bits.
>
>
> Regarding the temp reading, I think you better to read 'temperature'
> property after a simultaneous converT command instead of 'fasttemp' which is
> not prepared by the simultaneou command. - Paul correct me if not true -
>
> You may also find usefull information by starting your owfs daemon with
> '--debug' param. Reading temp involve a blocking transaction that wait until
> conversion is finished by polling 1-wire or for fixed time depending on
> method used and parasite power mode.
>
> Pascal
>
>
>
> 2011/2/3 "Roman Jałoza - TechBase Sp. z o.o." <r.jal...@a2s.pl>
>
>> Hi,
>>
>> I'm developing 1-wire communication at embedded computer with ARM9 and
>> ds2482-100 master chip.
>> Is anyone test owfs performance via i2c master?
>>
>> I'm reading temperature from ds18b20 sensors and it took a long time (from
>> 1,5s to 8s) with fasttemp read. It should be much faster. I've made some
>> tests with writing simultaneous/temperature bit but performance was still
>> the same - means poor.
>>
>> Reading PIO states from ds2408 device took about 600ms (but sometimes
>> 1,5s).
>>
>> Devices are powered (reading with parasite mode took 5-8s).
>>
>> Is anyone have some idea? some solution?
>>
>> --
>>
>> Best Regards * *
>> *Roman Jałoza*
>> **
>>
>>
>> ------------------------------------------------------------------------------
>> Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)!
>> Finally, a world-class log management solution at an even better
>> price-free!
>> Download using promo code Free_Logger_4_Dev2Dev. Offer expires
>> February 28th, so secure your free ArcSight Logger TODAY!
>> http://p.sf.net/sfu/arcsight-sfd2d
>> _______________________________________________
>> Owfs-developers mailing list
>> Owfs-developers@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>>
>>
>
>
> --
> Pascal
> www.brain4home.eu
> to subscribe, send a mail to <list-subscr...@brain4home.eu>
>
>
> ------------------------------------------------------------------------------
> The modern datacenter depends on network connectivity to access resources
> and provide services. The best practices for maximizing a physical server's
> connectivity to a physical network are well understood - see how these
> rules translate into the virtual world? http://p.sf.net/sfu/oracle-sfdevnlfb
>
>
> _______________________________________________
> Owfs-developers mailing
> listOwfs-developers@lists.sourceforge.nethttps://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
>
> ------------------------------------------------------------------------------
> The modern datacenter depends on network connectivity to access resources
> and provide services. The best practices for maximizing a physical server's
> connectivity to a physical network are well understood - see how these
> rules translate into the virtual world?
> http://p.sf.net/sfu/oracle-sfdevnlfb
> _______________________________________________
> Owfs-developers mailing list
> Owfs-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
--
Pascal
www.brain4home.eu
to subscribe, send a mail to <list-subscr...@brain4home.eu>
------------------------------------------------------------------------------
The modern datacenter depends on network connectivity to access resources
and provide services. The best practices for maximizing a physical server's
connectivity to a physical network are well understood - see how these
rules translate into the virtual world?
http://p.sf.net/sfu/oracle-sfdevnlfb
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
