Does the same error/bug exist for ow_ds9097U.c ?
On my WRT54G router I get really bad search time. 15 devices are listed in
minimum 3.3seconds (owserver + owfs). 100 loops will take about 5 minutes!
/Christian
[EMAIL PROTECTED]:~# cat /tmp/1wire/bus.0/system/adapter/name.ALL
DS9097U
[EMAIL PROTECTED]:~# cat apa.sh
#!/bin/sh
for i in 1 2 3 4 5 6 7 8 9 10 ; do ls /tmp/1wire/uncached ; done
[EMAIL PROTECTED]:~# time -v ./apa.sh
10.061847000800 10.5D1947000800 10.E2C746000800 alarm
10.1A9246000800 10.6D0150000800 10.E54347000800 bus.0
10.233B40000800 10.762047000800 1F.7DC202000000 simultaneous
10.2BD346000800 10.A22840000800 FF.710200000100
10.4D8746000800 10.B3E166000800 FF.720200000100
(repeated 10 times)
Command being timed: "./apa.sh"
User time (seconds): 0.10
System time (seconds): 0.19
Percent of CPU this job got: 0%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 37.17s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 0
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 258
Minor (reclaiming a frame) page faults: 417
Voluntary context switches: 0
Involuntary context switches: 0
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
_____
Från: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] För Paul Alfille
Skickat: den 19 november 2006 00:54
Till: [email protected]
Ämne: Re: [Owfs-developers] Need for Speed... (scanning speed)
Ahha!
It looks like a logic error -- if no device is found, the code still tests
for a CRC error in the serial number, and probably asks for retries.
Fixed in the CVS.
Paul
On 11/18/06, Paul Alfille <[EMAIL PROTECTED]> wrote:
It will take some looking (?check stats?) but I really suspect the problem
is with a timeout waiting for a response with no devices. Can you compare
0,1,2 devices on the bus?
Paul
On 11/18/06, Jan Kandziora <[EMAIL PROTECTED]> wrote:
Am Samstag, 18. November 2006 22:52 schrieb Paul Alfille:
> That's not good.
>
If 160ms/scan is the worst time you measured, it means there's hope I don't
need to change parts of the machine design. Scanning locks connected to an
USB adaptor is quite faster (at least on my development PC), but the machine
should use the DS2482-800 instead.
I will setup a stable measurement environment on the actual platform around
next wednesday.
> If we can't resolve it this way, we may have to add a special "file" that
> checks for ANY device on the bus rapidly.
>
Hm. I don't understand where the difference would be. Could you explain?
My idea was, the problem lies somewhere in the timing of onewire or i2c, or
in
the timing requirements of the host OS. To achieve a rapid scan of a
(sub)bus, one has to issue the "triplet" command rapidly. This could exhaust
the process' timeslice and such, the owserver etc. is getting "niced". Maybe
a static priority for owserver helps? I haven't checked so far.
Kind regards
Jan
--
Alles Schwere kommt von oben...
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