#emc-devel | Logs for 2011-07-07

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[00:15:03] <PCW> Andy: there?
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[00:27:08] <PCW> Note that this is not a buffer issue with SSERIAL (there is no buffer really) Just an issue if the transfer time requirements are violated
[00:27:09] <PCW> This can happen if you are running close to the maximum thread rate and host jitter shortens your timing window such that the data has not
[00:27:11] <PCW> returned yet. It can also happen at close to the maximum rate and you get a CRC error on the remote device, causeing the
[00:27:12] <PCW> command complete to be delayed by the response timeout delay (150 uSec on the 8I20). The basic solution is to run slow enough that
[00:27:14] <PCW> the command is always complete even with some host jitter and possible CRC errors. In any case getting a command not complete error should
[00:27:15] <PCW> cause the driver to skip the DOIT write (as the firmware is still busy) and log the error.
[00:35:39] <PCW> Worst case delay from DOIT to command complete is the device timeout (150 uSec for 8I20) + a small amount of firmware overhead
[00:35:41] <PCW> (maybe 24 uSec worst case for slowest firmware (5I20)). So even at 200 uSec you would need pretty low latency to avoid violating timing
[00:35:43] <PCW> So 4 or even 3 KHz thread rates would be better unless you know the maximum jitter. Skipping the DOIT on a command not complete status
[00:35:44] <PCW> should fix most bad side effects if you want to live closer to the edge and may have occasional command not completer errors
[00:39:47] <mshaver> PCW: Tomorrow I'm going to slow the thread rate _way_ down using the v17 bit file to make sure it works. Probably 1kHz or even 500Hz just to see how it goes.
[00:43:39] <PCW> The driver really needs to not write commands if the previous command is not complete (however this may happen)
[00:44:42] <PCW> Did you try lower than 5KHz? That may still be on the edge (depending on your latency)
[00:44:55] <mshaver> I think Andy is going to change that, but I want to see if I can verify the problem in the meantime.
[00:45:01] <mshaver> No, not yet.
[00:45:15] <mshaver> Tomorrow!
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[09:47:07] <mhaberler> Q: is "user interface and milltask may reside on different machines" actually a requirement?
[10:18:20] <mhaberler> Q: are the IRC logs from http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?IrcLogs lost in the mists of history? any backups?
[10:21:12] <psha[work]> mhaberler: you mean 2005 ones?
[10:21:35] <mhaberler> before 2005 - the links in there are 404's
[10:21:48] <KimK> Would one of these help? http://emc.mah.priv.at/irc/ http://psha.org.ru/irc/
[10:22:41] <psha[work]> KimK: heh, one is mhaberler's logs other are mine :D
[10:22:50] <psha[work]> s/are/is
[10:23:05] <KimK> Ha, OK, jokes on me then!
[10:23:06] <mhaberler> without the search engine..
[10:23:24] <mhaberler> psha: never got that to work btw
[10:23:34] <mhaberler> I'd like to, some day
[10:23:46] <psha[work]> mhaberler: http://psha.org.ru/irc/%23emc/2004-10-18.html
[10:24:06] <psha[work]> so i've 2004 logs to some extent
[10:24:24] <psha[work]> http://psha.org.ru/irc/%23emc/index-2004.html
[10:24:28] <mhaberler> ah, these are in #emc, not #emc-devel
[10:24:37] <psha[work]> yes, there was no #emc-devel in 2004 i guess
[10:26:02] <psha[work]> whaa, how to get results from next page? :D
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[10:27:44] <psha[work]> http://psha.org.ru/irc/search/?q=emc-devel+channel&channel=emc&order=date&start=90
[10:28:34] <psha[work]> mhaberler: so let's find some time and finish search integration for you?
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[10:29:36] <mhaberler> let me warm up my understanding of the setup and I'll bug you then; I think what failed was some xml conversion, but it's a long time since, dont remember
[10:29:49] <mhaberler> when it's a convenient time for you?
[10:30:50] <psha[work]> some chances are that today i'll be here in the evening
[10:31:12] <mhaberler> ok, I'll bug you when warmed up ;-)
[10:31:40] <psha[work]> but maybe i'll be changing breaks in a car
[10:31:45] <psha[work]> and left mirror
[10:31:57] <mhaberler> oh, "close encounter"?
[10:32:28] <psha[work]> no, just time for some makeup :)
[10:32:44] <psha[work]> left mirror is broken at least for a year :)
[10:32:56] <psha[work]> and breaks sounds like it's time to change them
[10:33:12] <mhaberler> you dont need it if driving in the fast lane is modus operandi
[10:33:35] <mhaberler> those are optional in that case, too
[10:33:59] <psha[work]> heh, i'll go for ~4k km trip in first two weeks of august so it's better to keep car in good shape :)
[10:34:07] <mhaberler> uh, where?
[10:34:44] <psha[work]> moscow - murmansk
[10:34:46] <psha[work]> in general
[10:34:53] <psha[work]> in details it's far more complex :)
[10:35:28] <mhaberler> sorting ice cubes ? -)
[10:35:30] <psha[work]> some cultural program (monastery), some light offroad program (trip around low mountains) and some hardcore offroad fun :)
[10:36:00] <psha[work]> last part depends on 3rd car in our caravan
[10:37:05] <psha[work]> there are chances that we'll get lifter pajero sport with capstain as third car
[10:37:12] <psha[work]> s/lifter/lifted/
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