#linuxcnc-devel | Logs for 2014-06-29

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[00:01:41] <jepler> beautiful 20kHz pwm
[00:01:55] <jepler> from hostmot2 pwmgen running with userspace rtapi
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[00:56:36] <jepler> wow, gone for nearly two years
[00:56:40] <jepler> an achievement
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[01:13:11] <cradek_> jepler: yay! pci!
[01:14:32] <jepler> cradek_: this project went really fast
[01:17:04] <jepler> fwiw I think the smart parport cards should be doable too. there's a "uparport" driver that talks to real (SPP) parports in userspace, builds to hal_parport under sim / uspace
[01:17:26] <jepler> somebody just needs to do similar work to the rtapi_pci work, define the API that rtapi will support and implement it for kernel and userspace
[01:18:22] <jepler> .. because two full implementations of a dumb parport driver is unfortunate; it'd be even sadder if we had our smart parport drivers as twins to
[01:18:25] <jepler> o
[01:19:44] <jepler> it looks like there's a version of this in ubc3, but as with other drivers they did it in a way that required #ifdef soup
[01:20:10] <jepler> #if defined(USE_PORTABLE_PARPORT_IO)
[01:20:11] <jepler> indata = hal_parport_read_data(&port->portdata);
[01:20:11] <jepler> #else
[01:20:12] <jepler> indata = inb(port->base_addr);
[01:20:12] <jepler> #endif
[01:20:53] <jepler> .. it makes my teeth itch
[01:36:02] <mozmck> jepler: what do you prefer to "#ifdef soup"?
[01:37:12] <jepler> mozmck: provide a single function (or function-like macro) that can be used in both situations
[01:37:51] <jepler> in this case, you can see that for the two underlying functions, both need something inside of 'port', so it would be a function which takes &port as its argument
[01:38:02] <mozmck> would this function have the #ifdef stuff in it? or maybe use function pointers to make it more "object oriented"?
[01:38:56] <jepler> that function would involve a #define at its definition or declaration site, but not at each use site
[01:39:06] <mozmck> yes, I see.
[01:39:36] <mozmck> abstraction
[01:39:41] <jepler> yes
[01:40:00] <mozmck> good stuff if not overdone
[01:40:50] <mozmck> glad you got this working so quickly btw!
[01:41:15] <jepler> in almost all the cases that I've tackled in rtos-uspace-apis, the kernel version is a simple #define that redirects to the original linux kernel API
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[01:41:45] <jepler> so in kernel space, it's likely I've added no runtime overhead for this abstraction
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[01:45:01] <jepler> Hmm, $32 for ebay used memory or $40 for amazon new memory?
[01:47:14] <jepler> .. new memory.
[01:47:38] <jepler> how sad that 4GB is starting to feel too small for a laptop
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[01:48:59] <mozmck> is that with Debian?
[01:49:21] <jepler> mozmck: yes, but it's mostly driven by some memory-hungry Steam games. debian itself is just dandy.
[01:49:41] <jepler> but run a steam game, a 1.5GB virtual machine, and a firefox and 4GB doesn't cut it
[01:49:53] <mozmck> ah, I never game, but java stuff takes a lot.
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[01:51:29] <mozmck> I run virtualbox with winxp with 1gb mem, eclipse, and firefox on my laptop with 4GB and it does start to slow down a little.
[01:51:47] <mozmck> Cinnamon takes up some, but it's better than it was.
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[02:12:18] <jepler> I favor the xfce desktop these days, but mostly because it does just about the least stuff.
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[14:54:28] <jepler> huh, ubuntu on -rt kernels:
[14:54:30] <jepler> >>> The -preempt and -rt kernels are no longer being developed due to lack of support. Focus has instead turned to the -lowlatency and -realtime kernels, particularly for the the release of Ubuntu 11.04 Natty Narwhal. The long-term goal is to have -lowlatency in the official Ubuntu repositories, while maintaining -realtime in a dedicated PPA.
[14:54:51] <jepler> what's a -realtime kernel, as compared to a -rt kernel?
[14:55:18] <jepler> > From a technical point of view, -rt and -realtime are the same kernel. They are both based on the PREEMPT_RT patchset, although the version may be different
[14:55:55] <jepler> > On the other hand, the -realtime kernel is a PREEMPT_RT patched kernel based on the vanilla source tree (not the Ubuntu source).
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[15:52:33] <seb_kuzminsky> jepler: i'm super excited for the posix branch
[15:53:03] <seb_kuzminsky> i'm going to install with cradek's wheezy live-cd on a spare partition on my bridgeport, then i'll try out your branch on it
[15:53:09] <seb_kuzminsky> it's got a 5i22
[15:54:19] <seb_kuzminsky> this makes me excited to get 2.6 out, so we can start getting this new feature out for 2.7 :-)
[15:55:53] <cradek_> yes I sure agree with that
[15:56:15] <cradek_> unfortunately I still haven't managed to get the lapic to survive the install
[15:56:19] <cradek_> I'd like to figure that out
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[15:57:31] <seb_kuzminsky> i'd like to get the same kernel running on precise, then imma call it good
[15:58:58] <cradek> https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/581796
[15:59:02] <cradek> well it ain't me
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[16:11:51] <seb_kuzminsky> then it ain't your job to fix (unless you choose to nobly add work to your plate), and we should release as is
[16:12:06] <cradek> well now it's my job to hack around
[16:12:29] <cradek> seems like it's been reported many times over 4+ years to ubuntu but never kicked upstream
[16:18:00] <cradek> seb_kuzminsky: can you somehow make a ~pre4 wheezy build go to the l.o repo? I'm working on getting the sources right after install, and for the release I don't want buildbot in there anymore
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[16:22:38] <seb_kuzminsky> yes, i'll do that, it'll be a couple hours at least
[16:24:11] <seb_kuzminsky> i wish linuxcnc-build_ 's irc presence was smart enough to survive a netsplit
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[16:26:18] <Tom_itx> i swear i saw 'release' in this page somewhere...
[16:27:01] <seb_kuzminsky> heh
[16:27:10] <seb_kuzminsky> the time is nigh
[16:27:32] <seb_kuzminsky> as we say at my day job: we've never been closer
[16:27:56] <cradek> seb_kuzminsky: thank you! maybe I can roll a final test image still this weekend then
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[16:29:30] <jepler> seb_kuzminsky: if you're excited enough, I can just merge it to 2.6.
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[16:30:35] <jepler> (I'm pretty confident that's a joke)
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[16:41:33] <cradek> sigh, no, Alt-F4 in qemu in the middle of an install doesn't give you that other console...
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[16:45:04] <jepler> oops, ow
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[16:45:53] <cradek> at least while working on the preseed, I can fetch it over http and not rebuild the image (1 hour) each time
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[17:02:36] <linuxcnc-build> build #2199 of 1202.rip-lucid-amd64 is complete: Failure [4failed compile runtests] Build details are at http://buildbot.linuxcnc.org/buildbot/builders/1202.rip-lucid-amd64/builds/2199
[17:06:00] <linuxcnc-build> build #2201 of 0000.checkin is complete: Failure [4failed] Build details are at http://buildbot.linuxcnc.org/buildbot/builders/0000.checkin/builds/2201
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[17:16:22] <jepler> seb_kuzminsky: OK for 2.6? They make linuxcnc build and pass tests on an arm chromebook running debian 7 in crouton. http://emergent.unpythonic.net/files/sandbox/arm-patches.mbox.txt
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[17:34:35] <cradek> yay, lapic
[17:34:45] <jepler> as for that failure:
[17:34:45] <jepler> emcTaskPlanCommand(o<sub> endsub) called. (line_number=7)
[17:34:45] <jepler> emc/task/emctask.cc 389: interp_error: cannot reopen file (null) - removed or renamed? (No such file or directory)
[17:34:48] <jepler> cannot reopen file (null) - removed or renamed? (No such file or directory)
[17:35:01] <jepler> I think I've seen this another time recently from the buildbot. I haven't looked into it
[17:37:14] <jepler> where the message has "(null)" the enclosing code doesn't seem to be passing in the actual file that was opened
[17:37:23] <jepler> settings->file_pointer = fopen(previous_frame->filename, "r");
[17:37:26] <jepler> if (settings->file_pointer == NULL) {
[17:37:29] <jepler> ERS(NCE_CANNOT_REOPEN_FILE,
[17:37:31] <jepler> settings->sub_context[settings->call_level].filename,
[17:37:34] <jepler> strerror(errno));
[17:37:37] <jepler> }
[17:37:59] <jepler> so we don't even know what file couldn't be open
[17:38:59] <jepler> .. on my system, fopen(NULL, "r") sets errno to EFAULT
[17:40:52] <jepler> ugh, the commit that changed the fopen argument has this terrible commit message:
[17:40:55] <jepler> >>>
[17:40:56] <jepler> <<<
[17:40:58] <jepler> wip - looks good in mdi & auto
[17:41:00] <jepler> Conflicts:
[17:41:03] <jepler> src/emc/rs274ngc/rs274ngc_pre.cc
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[18:18:30] <skunkworks> jepler: neat - I thought you where getting <20us latencys with the rt_preept.. that is as good as rtai on most machines..
[18:19:49] <skunkworks> I can test the 5i25 - also - I can test the 7i80..
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[18:25:36] <jepler> skunkworks: sometihng like 10-12us, though I'm not running X at the console so it may not really count
[18:27:36] <jepler> though I meant to say that rt-preempt is *not* good enough for software step generation
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[18:41:06] <skunkworks> jepler: ok. why, if the latency is decent, would it not work for software step gen?
[18:42:20] <jepler> skunkworks: maybe I've forgotten the math, but it seems like that doesn't give you much step rate
[18:43:37] <skunkworks> 10 -12us is as good or better than rtai on a lot of systems...
[18:44:15] <jepler> hm ok
[18:44:22] <skunkworks> the default base period in most configs is 50us
[18:45:14] <skunkworks> that would give you 20khz without doublestep
[18:46:20] <skunkworks> at 10 - 12us - you might be able to run a 25us base thread...
[18:46:41] <skunkworks> that would be 40khz without doublestep
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[18:49:20] <jepler> hm ok then
[18:49:33] <jepler> I wonder what the latency would be if I was running X and stressing it, though
[18:50:01] <archivist> I get just under 16k latency on a recent old box
[18:50:02] <skunkworks> when I was playing with rt_preempt with the 7i80 and ubc - the best I got was around 80us - that was runing the normal latency test
[18:50:23] <skunkworks> (base and servo thread)
[18:50:48] <skunkworks> or maybe I wasn't running a base thread.. I really don't remember..
[18:51:02] <jepler> originally I saw 80ms on a 1ms servo thread when I ran without a base thread
[18:53:22] <jepler> that's "fixed" by opening a special file and writing "0" to it
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[19:14:43] <KGB-linuxcnc> 03Jeff Epler 052.6 11f48ef 06linuxcnc 10src/emc/rs274ngc/interp_o_word.cc interp: print correct filename in message * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=11f48ef
[19:14:43] <KGB-linuxcnc> 03Jeff Epler 052.6 b2b1954 06linuxcnc 10src/emc/rs274ngc/interp_internal.hh 10src/emc/rs274ngc/rs274ngc_pre.cc interp: need to initialize context_struct * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=b2b1954
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[19:52:05] <seb_kuzminsky> welp, found the breaker
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[19:52:43] <seb_kuzminsky> jepler: did you say (before i disconnected) that the build failure we just got (http://buildbot.linuxcnc.org/buildbot/builders/1202.rip-lucid-amd64/builds/2199/steps/runtests/logs/stdio) was fixed with the commits you just pushed?
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[19:53:09] <seb_kuzminsky> if so maybe i should make a 2.6.0~pre5 instead of trying to build ~pre4 again
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[20:01:51] <jepler> seb_kuzminsky: I believe it is
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[20:10:41] <seb_kuzminsky> ugh, 2.5 doesn't merge into 2.6 because of conflicts in the french docs
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[20:14:14] <jepler> to resolve that, I'd have to understand the difference between _..._ and '...', not french
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[20:18:13] <JT-Shop> '...' is italics and _..._ is italic too
[20:19:08] <JT-Shop> in AsciiDoc
[20:19:25] <jepler> seb_kuzminsky: I can do the merge if you like
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[20:26:28] <seb_kuzminsky> linuxcnc-build: force build --branch=2.6 --revision=v2.6.0-pre4 0000.checkin
[20:26:34] <linuxcnc-build> The build has been queued, I'll give a shout when it starts
[20:26:46] <seb_kuzminsky> jepler: thanks, i'd appreciate that. i'm running around doing house projects today
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[20:27:25] <seb_kuzminsky> has anyone done any testing beyond runtests on the new 3.4-9-rtai-686-pae kernel? i haven't
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[20:29:14] <KGB-linuxcnc> 03Jeff Epler 052.6 208025b 06linuxcnc 10docs/html/gcode_fr.html 10docs/src/config/ini_config_fr.txt 10docs/src/gcode/gcode_fr.txt Merge remote-tracking branch 'origin/v2.5_branch' into 2.6 * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=208025b
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[20:30:06] <jepler> seb_kuzminsky: not I. I wanted to use it when my 5i20 card was misbehaving, but I had an amd64 install so it didn't help
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[20:30:31] <jepler> (weird problem. apparently the id eeprom had spontaneously deprogrammed itself. fixed by running the DOS eeprom programmer)
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[22:42:38] <jepler> I wonder why debian doesn't package -rt kernels for arm
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[22:43:56] <jepler> .. maybe pre-built arm kernels only work on a few devices anyway
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[23:03:03] <dgarr> seb_kuzminsky: i
[23:04:25] <dgarr> i have loaded the 3.4.9-rtai on wheezy and get an oops at realtime start on a machine (amd sempron) that has run lucid-rtai for years
[23:04:27] <dgarr> http://www.panix.com/~dgarrett/stuff/3.4-9-rtai.txt
[23:04:49] <dgarr> maybe there is a clue in the syslog report
[23:05:33] <skunkworks> jepler: is there a 101 on installing the -rt kernel?
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[23:11:30] <seb_kuzminsky> thanks for the report, dgarr
[23:11:35] <seb_kuzminsky> i'll take a look at it
[23:13:10] <dgarr> skunkworks: on wheezy, there is a -rt image available so it is easy with synaptic (i think) linux-image-3.2.0-4-rt-686-pae
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[23:18:19] <CaptHindsight> anyone know if you still have to set the stepgen a few % higher for each axis than the trajectory section of the .ini?
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[23:32:23] <micges-dev> CaptHindsight: yes, you still have to
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[23:32:48] <CaptHindsight> micges-dev: thanks, did it anyway :)
[23:34:49] <micges-dev> heh ok
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[23:43:13] <jepler> skunkworks: yes, on debian 7 install the realtime kernel image, linux-image-3.2.0-4-rt-686-pae or -amd64. then build linuxcnc with --enable-realtime=uspace, make and (this is new) sudo make setuid
[23:44:00] <skunkworks> micges-dev: how hard is it to make the mesa ethernet work with uspace?
[23:46:43] <micges-dev> I think it will just works
[23:47:29] <skunkworks> oh
[23:47:52] <skunkworks> jepler: could you bring the hm2-ethernet into your branch?
[23:47:56] <jepler> I hope it will. I haven't tried cherry-picking the commits onto my branch, though. don't have hardware to test with anyway.
[23:49:08] <jepler> skunkworks: if you mean origin/ubc3-7i80 that's not easy because just doing a merge of that branch would bring in a pile of undesired stuff
[23:49:24] <dgarr> jepler: is new uspace work required for hal_ppmc.c?
[23:49:31] <micges-dev> skunkworks: I'll try to run driver in uspace tomorrow
[23:49:51] <jepler> dgarr: yes, I have not touched any drivers but the ones specifically listed in my e-mail (serport, hostmot2, hm2_pci, hm2_test)
[23:50:19] <jepler> dgarr: for userspace EPP, it will be necessary to create some new APIs to regularize the hardware access between userspace and kernel
[23:50:38] <dgarr> i have a wheezy partition now and could test hal_ppmc if you work on it
[23:51:12] <jepler> dgarr: I'll keep that in mind. I have a mesa epp card, but not parport in my testing computer
[23:51:16] <jepler> I should pick one up, I guess.
[23:51:53] <jepler> dgarr: you've been with us for a long time, maybe you're about ready to start writing realtime hardware driver code. Yes?
[23:53:12] -!- aniM has quit [Ping timeout: 260 seconds]
[23:55:10] <dgarr> maybe but i have many projects going already
[23:56:08] -!- george2 has quit [Quit: george2]
[23:58:56] <jepler> I know the feeling. It was mostly said in good fun.
[23:59:16] <jepler> .. just the slighest bit of seriousness, because I am confident you could learn if you cared to