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[13:24:10] <skunkworks> hmm - how do I get lstopo?
[13:25:12] <skunkworks> it isn't in /bin
[13:27:22] <skunkworks> ah - hwloc
[13:31:59] <skunkworks> seb_kuzminsky,
http://pastebin.com/XbN0zZni
[13:32:30] <skunkworks> makes sense as L2 is shared between 2 cores.
[13:33:18] <skunkworks> I would probably get the same results with isolating 0,1 vs 2,3
[13:33:28] <skunkworks> overnight 12us
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[14:13:23] <skunkworks> I wonder how the rt_preempt would preform using those settings.
[14:14:04] <skunkworks> or perform even...
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[14:45:17] <seb_kuzminsky> skunkworks: cool, thanks
[14:45:33] <skunkworks> Am I understanding it right?
[14:49:45] <seb_kuzminsky> your statement matches my understanding as well
[14:49:55] <jepler> no, I don't think you would get the same result isolating 0,1
[14:50:07] <jepler> because linuxcnc will run realtime threads on the top CPU number all the time
[14:50:21] <jepler> linuxcnc (rtapi) doesn't look at what CPUs are subject to isolcpus
[14:50:27] <seb_kuzminsky> ah, right
[14:50:33] <seb_kuzminsky> well, i agree with this statement: < skunkworks> makes sense as L2 is shared between 2 cores.
[14:50:55] <seb_kuzminsky> vcpus 0 & 1 share one L2, and vcpus 2 & 3 share another L2
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[14:53:06] <jepler> there's a libhwloc. somebody should build it into a program that tells you what isolcpus= setting to use
[14:56:05] <skunkworks> ah. would these setting have any effect on rt_preempt?
[14:56:40] <jepler> the only other thing I have to mention is that I swear I saw one system where the pairs weren't 2*k and 2*k+1 but k and k+n according to /proc/cpuinfo
[14:56:53] <jepler> skunkworks: yes, isolcpus= seems to also affect rt_preempt performance
[14:57:01] <jepler> I use isolcpus=3 on my odroid
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[14:58:01] <skunkworks> I will try it
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[15:02:54] <jepler> looks lke I tried to write this script once before
http://emergent.unpythonic.net/files/sandbox/isol.sh
[15:05:12] <jepler> http://paste.debian.net/130552/
[15:05:41] <skunkworks> wow
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[15:06:28] <jepler> and on my odroid:
http://paste.debian.net/130554/
[15:07:31] <skunkworks> that could be part of the latency test.. could even add it to the kernel line.. :)
[15:08:20] * skunkworks waits for 'patches welcome'... :)
[15:09:36] <jepler> skunkworks: do you have a github account?
[15:12:09] <jepler> *crickets*
[15:13:12] <archivist> that is the sound of him typing on his keyboard
[15:14:03] <jepler> I was thinking about the thread "Probably a documentation error". Anybody with a github account could prepare a patch to the documentation, just within the github website
[15:14:21] <jepler> .. skunkworks would be a good guinea pig for this process
[15:14:42] <jepler> you don't even need to 'git clone' or have git on your computer to do doc changes
[15:15:03] <jepler> if we could convince users to fix the docs for us, then linuxcnc documentation would be perfect
[15:15:06] <jepler> right?
[15:15:40] <archivist> I usually mention to JT when I spot something (cheating)
[15:15:56] <jepler> yeah, though he can only do so much
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[15:21:40] <skunkworks> I could play with that in the future.
[15:21:52] <skunkworks> I have to make a note to future self
[15:24:15] <jepler> I'm not sure how well this idea actually works in practice, so it would be interesting to find out
[15:24:32] <jepler> if it worked well I'd totally push it in every thread which is ultimately about a documentation issue
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[15:41:12] <skunkworks> ok - readline-common is installed..
http://pastebin.com/iGphVtjw
[15:42:22] <bjmorel_work> I think you need readline-dev
[15:44:08] <skunkworks> it doesn't exist in my world...
[15:45:02] <skunkworks> ah - maybe libreadline
[15:45:12] <seb_kuzminsky> it's spelled libreadline-dev
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[15:50:57] <skunkworks> got it.
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[16:04:53] <KGB-linuxcnc> 03Sebastian Kuzminsky 05liblinuxcnc-ui 260e5e6 06linuxcnc 10src/emc/usr_intf/emcrsh.cc linuxcncrsh: use lui for setting task mode (manual/auto/mdi) * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=260e5e6
[16:04:53] <KGB-linuxcnc> 03Sebastian Kuzminsky 05liblinuxcnc-ui 5cb466f 06linuxcnc 10src/liblinuxcnc-ui/Submakefile 03src/liblinuxcnc-ui/coolant.cc 10src/liblinuxcnc-ui/linuxcnc-ui.h lui: add mist/flood on/off * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=5cb466f
[16:04:53] <KGB-linuxcnc> 03Sebastian Kuzminsky 05liblinuxcnc-ui 4ad18a6 06linuxcnc 10src/emc/usr_intf/emcrsh.cc linuxcncrsh: use lui for mist/flood on/off * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=4ad18a6
[16:04:55] <KGB-linuxcnc> 03Sebastian Kuzminsky 05liblinuxcnc-ui fcef840 06linuxcnc 10src/emc/usr_intf/xemc.cc xemc: use lui for flood/mist on/off * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=fcef840
[16:13:25] <skunkworks> Umm - wow...
http://electronicsam.com/images/KandT/testing/Screenshot%20-%2011062014%20-%2006:11:42%20PM.png
[16:13:48] <skunkworks> idle=poll and isolcpus=2,3
[16:15:42] <seb_kuzminsky> skunkworks: wow!
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[16:16:14] <seb_kuzminsky> heh, "introduction to linuxcnc", "electronics overview for mill conversion with linuxcnc", "making a tardis"
[16:17:13] <skunkworks> odd
[16:17:44] <jepler> obviously a steep learning curve there
[16:17:59] <skunkworks> oh - the video.. (it is just long so I use it for testing..)
[16:18:17] <archivist> some very poor "related" on many of the sites these days
[16:20:08] <skunkworks> about 50 frames a second on the full screen glxgears
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[16:21:38] <skunkworks> up to 10us
[16:25:16] <seb_kuzminsky> skunkworks: is this your j1900?
[16:25:28] -!- ejb has quit []
[16:25:29] <skunkworks> yes
[16:25:35] <skunkworks> I also have a J1800
[16:25:39] <kb8wmc> I was directed over here while looking to download camview-emc from psha's site, it was suggested that someone had mirrored psha's site...can anyone here confirm and direct me to such a mirror
[16:26:14] <skunkworks> I think CaptHindsight, was talking about it...
[16:26:31] <kb8wmc> ok
[16:26:47] <skunkworks> (I noticed psha's site was down today..)
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[16:28:02] <kb8wmc> yes and it must have been down for the last couple days as I have attempted to reach it for d/l for last two days without success
[16:28:45] <archivist> has archive.org got a copy too
[16:29:07] <kb8wmc> don't know, did not look there
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[16:32:06] <alex_joni> they don't mirror attachments though
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[16:33:13] <kb8wmc> I did not find it there at archive.org
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[16:51:17] <skunkworks> still 10us
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[17:11:51] <skunkworks> pcw, you should try that ^
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[17:39:45] <skunkworks> I will let it run over night
[17:40:36] <skunkworks> so - for better realtime performance - you sould look for cache layouts that are not shared... - interesting
[17:40:40] <skunkworks> bbl
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[17:54:35] <KGB-linuxcnc> 03John Thornton 052.6 29bbf2d 06linuxcnc 10docs/src/gcode/gcode.txt Docs: add text describing example code * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=29bbf2d
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[18:25:34] <skunkworks> the_wench: where is your log?
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[18:45:50] <PCW> skunkworks: i tried isolcpus=1 and idle-poll, I dont see much difference (latency test results look good but actual jitter is still around 30 usec)
[18:47:05] <seb_kuzminsky> do you mean "idle=poll"?
[18:47:12] <PCW> yes
[18:48:14] <PCW> I really dont think the latency test means much except for noticing gross problems
[18:50:23] <PCW> now 30 usec is a lot better than the D525s ~75 usec latency
[18:52:28] <PCW> (which explains why you cant use more than about a 1.5 KHz servo thread on a a D525 without getting RT errors)
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[18:57:25] <skunkworks> PCW, with the j1900 and idle=poll isolcups=2,3 I was getting a max of 10us (but will run it overnight) the best I was getting before was around 70us
[18:58:31] <PCW> Maybe quad core difference, I always seem to get around 10-11 usec worst case on the j1800
[18:58:46] <PCW> (under RTAI)
[19:01:30] <PCW> let me go back to no idle=poll and no isolcpus=1 and run the test for an hour or so
[19:04:01] <skunkworks> that was rt_preempt...
[19:17:36] <PCW> ok that _does_ improve the preemt-rt latency
[19:18:52] <PCW> at least the test (I was getting about 50 usec is a few minutes with youtube videos running, now its about 15 usec)
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[19:22:16] <skunkworks> on what system?
[19:26:23] <PCW> Gigabyte J1800
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[19:27:03] <skunkworks> the j1900 shares cache between pairs of cores. 0,1 and 2,3
[19:28:21] <PCW> but... while the idle-poll and isolcpus improve the latency test, they do not seem to affect the actual max jitter (as measured with hardware)
[19:28:23] <PCW> it mainly makes the system slower
[19:28:54] <skunkworks> heh - well that sucks
[19:30:53] <PCW> well it no different than before, code that runs in the servo or base thread may be delayed by random times that do not show up in the latency test
[19:31:38] <bjmorel_work> PCW: did you try the isolcpus on a 4-core? I could see it not having an effect on the 2-Core J1800 because of the shared cache, but it might work ok on the 4-core.
[19:32:08] <PCW> It has an effect (but only on the latency test)
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[19:33:03] <PCW> I dont have a 4 core CPU that I can use to test ATM
[19:36:53] <skunkworks> I can play with it tomorrow..
[19:38:07] <skunkworks> for some reason - I thought you had the 1900 also
[19:39:42] <PCW> No, but I may buy this one for testing:
[19:39:43] <PCW> http://www.newegg.com/Product/Product.aspx?Item=N82E16813157565
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[19:41:05] <skunkworks> the gigabit j1900's have 2 nics.
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[19:46:27] <PCW> Yeah but i wanted a different brand to try
[19:47:07] <PCW> (I do have Asrock J1900 at home but for HTPC)
[19:51:58] <skunkworks> ah
[19:57:02] <CaptHindsight> isolcpus= behaves it self in the new RTAI tree, in fact you don't even need to use it anymore since the scheduler is fixed
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[20:34:49] <kwallace1> In my opinion, that's a pretty darn nice board above. 2 x PCI, PCIe, a parallel port, serial port, HDMI, good latency and low cost (not too much more than a Beagle). I wonder why PCI (or parallel port) hasn't been killed off yet. I'm not a fan of Intel graphics, I wonder how well OpenGL gets along with this board.
[20:35:52] <kwallace1> Fan-less too?
[20:36:12] <PCW> fanless and graphics seem fine
[20:36:31] <kwallace1> Cool
[20:36:47] <PCW> most of the new J1800,J1900 MBs have a parallel port
[20:37:01] <PCW> (often on a header)
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[20:39:50] <kwallace1> Offhand, is there a write-up on a hardware latency test?
[20:43:23] <PCW> Im cheating and using the hm2dpll
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