I have removed the extra delay in *_reset() for ds2404 alarm compliance. Only if such a device is found, it's enabled. That will improve response time with 5ms. I will see if I can find some more delays to optimize.
/Christian On Tue, 2005-06-28 at 08:20 -0400, Alfille, Paul H.,M.D. wrote: > This is great. We needed to do this stress-testing for a while now. > > It's also amazing how many of these small bugs weren't found when we never > tried > to reconnect. > > Next project: > > I wonder if we can try upping the serial connection speed for the DS9097U. My > tests indicate serial is slower than USB but uses less CPU time -- suggesting > a > lot of time waiting. > > My thought was to slowly up the speed, until bugs appear, them adjust speed > over > time based on recent success. There must be a good algorithm. > > Paul > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of > Christian Magnusson > Sent: Tuesday, June 28, 2005 7:54 AM > To: owfs-developers@lists.sourceforge.net > Subject: RE: [Owfs-developers] More on "Hanging" Problems > > > > I feel pretty comfortable with the USB reconnection now. I started > owhttpd and made a loop reading some files from an iButton. > > owhttpd -p 3333 -s 3001 > owserver --foreground -u -p 3001 --error_level=1 > > -------- > #!/bin/sh > while [ 1 ]; do > lynx --source http://172.20.1.122:3333/uncached/ > /dev/null > lynx --source http://172.20.1.122:3333/uncached/02.6537C2000000/memory > > /dev/null > lynx --source > http://172.20.1.122:3333/uncached/02.6537C2000000/pages/ident.ALL > > /dev/null > echo -n "." > done > -------- > > When I removed one iButton and really tried to simulate bad connection > by moving it around close to the connectors, it failed in the > BUS_select_low() and DS9490_reset() very often. I found some > null-pointer bug when the usb-port was closed, but it reconnects > all the time for me now. Hopefully it works when adapter hangs in other > situations too. > Could Jan test this version and tell us how it works for him... > > > > Some debug-output from owserver: > > (adapter reconnects at first attempt) > ERR: USB DS9490 adapter reconnected > > (adapter tries to reconnect but fails) > ERR: Error setting up USB DS9490 adapter at 004/002. > ERR: Failed to reconnect USB DS9490 adapter! > ERR: BUS_reconnect, returned error = -5 > > (at next read it reconnects with success) > ERR: USB DS9490 adapter reconnected > > > > > On Tue, 2005-06-28 at 07:31 +0200, Christian Magnusson wrote: > > I agree... 3 attempts are perhaps not necessary. If it fails it should > > only be necessary to try 1 attempt and then return "read-error", since > > it's not possible to retry the old on-going operation anyway. > > > > I tried to start owserver to /dev/ttyS0 and then launch minicom on > > /dev/ttyS0 too. This will trig the read errors at once since minicom > > set the speed to 19200 baud and they will probably grab some chars > > each... :) > > > > When minicom exits everything initialize and owserver works again. > > I noticed one bug with oldSerialTio on COM_open() which should be > > separate for each serial port though. > > > > /Christian > > > > > > > > On Mon, 2005-06-27 at 18:40 -0400, Alfille, Paul H.,M.D. wrote: > > > Nice changes, Christian. > > > > > > I'm a little worried about burning CPU cycles if the adapter is unplugged. > We > > > will aggressively try to reconnect. > > > > > > I notice you make 3 attempts at reconnecting each time. That will be > multiplied > > > by the 3 attempts ar read/write. > > > > > > Would there be any harm in a delay before the 2nd and third reconnect > attempt? 1 > > > second? I suppose we could also allow a command line parameter to change > that > > > value for embedded systems where precisely tuning delays and utilization > > > is > > > important. Jan can offer some feedback on this. > > > > > > Paul > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] Behalf Of > > > Christian Magnusson > > > Sent: Monday, June 27, 2005 7:18 AM > > > To: owfs-developers@lists.sourceforge.net > > > Cc: [EMAIL PROTECTED] > > > Subject: Re: [Owfs-developers] More on "Hanging" Problems > > > > > > > > > > > > Try the latest cvs again... I have fixed a missing > > > usb_release_interface() and some other statistics from those errors. > > > > > > /Christian > > > > > > > > > On Mon, 2005-06-27 at 11:34 +0200, Jan Kandziora wrote: > > > > Am Montag, 27. Juni 2005 05:26 schrieb Gregg C Levine: > > > > > Hello from Gregg C Levine > > > > > Paul, explain this phrase in better detail please: > > > > > "In any case, it's great that Jan has a setup where he can > > > > > consistently trigger the errors." In an embedded an environment it is > > > > > sometimes considered desirable to stress test the file system by > > > > > triggering power cycles. There's an article on that, and the methods > > > > > used somewhere on the Linux-MTD site. > > > > > > > > > What I do isn't stress-testing. That would mean to get parameters when > some > > > > component will probably fail and has to be replaced. That's not what > > > > I'm > > > > after, at least at the moment. > > > > > > > > I just ran into that failure - it makes 1-wire completely unusable for > > > > my > > > > application. > > > > > > > > > > > > > Now I can see for myself how a rigged system would be desirable for > > > > > stress testing the file system that we've created. But a detailed > > > > > explanation would be good thing. > > > > > > > > > > Jan, what are you running? Which distribution? What is the hardware > > > > > configuration? I walked into this meeting late, and left my agenda and > > > > > most of my notes in a different location. > > > > > > > > > I'm designing a semiautomatic vending machine with a lot of attached > devices > > > > (flow-rate sensors and solenoid driven valves), most of them in a > ten-meter > > > > range around the machine, but some of them about 100m far away. The > computer > > > > which will be built into this will be a MIPS based embedded board, > > > > which > > > > isn't completed yet. > > > > > > > > The computer I use to test is a Gene6310 "embedded" (more like barebone) > PC > > > > board. Its i386-family based. This computer is working and would be used > as a > > > > backup solution, if the MIPS board is not completed in time. > > > > > > > > I have a testbench, where I can arrange the devices like they were > > > > already > > > > put into that vending machine. I hooked up the 1-wire to USB via a > > > > off-the-shelf DS9490 adapter to the barebone. There is a mains > > > > transformer > > > > > 230/24V~ 150W (completely passive, not a switching one), which is the > power > > > > supply for the sensors and solenoids. The actual transformer for the > machine > > > > will be a 400W type, which makes things even worse. > > > > > > > > This mains transformer generates some kind of EMC when switching it "ON" > or > > > > "OFF" with an ordinary 230V switch. This is understandable if the > switching > > > > happens outside of the zero-cross of voltage (ON-switching) or current > (OFF- > > > > switching). The EMC pulse causes either the USB or the 1-wire (or both) > > > > to > > > > > disconnect - which leads owfs into an unusable state. > > > > > > > > I'm pretty sure I can minimize this EMC by putting a zero-cross and > snubbing > > > > circuit into my transformer - but I'm very unsure other appliances in > > > > the > pub > > > > or gas station where the vending machines will be mounted are so kind. > > > > > > > > That's why I think we have to be able to recover from this error > > > > automatically. > > > > > > > > Kind regards > > > > > > > > Jan > > > > > > > -- > > > Christian Magnusson <[EMAIL PROTECTED]> > > > > > > > > > > > > ------------------------------------------------------- > > > SF.Net email is sponsored by: Discover Easy Linux Migration Strategies > > > from IBM. Find simple to follow Roadmaps, straightforward articles, > > > informative Webcasts and more! Get everything you need to get up to > > > speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click > > > _______________________________________________ > > > Owfs-developers mailing list > > > Owfs-developers@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > > > > > > ------------------------------------------------------- > > > SF.Net email is sponsored by: Discover Easy Linux Migration Strategies > > > from IBM. Find simple to follow Roadmaps, straightforward articles, > > > informative Webcasts and more! Get everything you need to get up to > > > speed, fast. http://ads.osdn.com/?ad_idt77&alloc_id492&opÌk > > > _______________________________________________ > > > Owfs-developers mailing list > > > Owfs-developers@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/owfs-developers -- Christian Magnusson <[EMAIL PROTECTED]> ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_idt77&alloc_id492&op=click _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
