#glasgow on 2019-10-21 — irc logs at freenode.irclog.whitequark.org

2019-10-11 17:29 ChanServ changed the topic of #glasgow to: glasgow debug tool · code https://github.com/GlasgowEmbedded/glasgow · production https://www.crowdsupply.com/1bitsquared/glasgow · forum https://glasgow.whitequark.org · logs https://freenode.irclog.whitequark.org/glasgow

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00:32 <marcan> whitequark: for reference, my JACK buffer size is 16ms right now.

00:32 <whitequark> aha

00:32 <marcan> I do get underruns on discontinuities, but steady-state it's pretty good, though not perfect depending on what I'm doing

00:33 <marcan> I use the linux-rt patches but realtime on x86 is a shitshow anyway

00:33 * whitequark looks at `insmod nvidia`

00:33 <marcan> lol.

00:33 <whitequark> i mean

00:34 <whitequark> i don't use it at the same time as rt stuff

00:34 <whitequark> it *probably* shouldn't fuck things up if there's no actual GPU in the system

00:34 <marcan> if it compiles for RT

00:34 <whitequark> it does need an undocumented environment variable to even build with preempt-rt

00:34 <whitequark> export IGNORE_PREEMPT_RT_PRESENCE=1

00:34 <marcan> lol.

00:34 <whitequark> seems to work tho?

00:34 <whitequark> whatever horrifying hack it's using works

00:35 <whitequark> i think the reason that thing even exists is because of all the machine vision people using tegra

00:35 <whitequark> which i mean, actually what the fuck???

00:35 <marcan> hahahaha

00:35 <whitequark> sure i'm fucking around on my desk and so that's fine

00:35 <whitequark> but you assholes run some sort of a robot on it or whatever

02:42 <_whitenotifier> [GlasgowEmbedded/glasgow] whitequark pushed 2 commits to master [+0/-0/±2] https://git.io/JeRfZ

02:42 <_whitenotifier> [GlasgowEmbedded/glasgow] whitequark 0471275 - applet.audio.yamaha_opx: fix OPL3 reset.

02:42 <_whitenotifier> [GlasgowEmbedded/glasgow] whitequark fd25ade - applet.audio.yamaha_opx: allow user-defined command stream filters.

03:26 <_whitenotifier> [glasgow] Success. The Travis CI build passed - https://travis-ci.org/GlasgowEmbedded/glasgow/builds/600526139?utm_source=github_status&utm_medium=notification

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14:11 <emily> marcan: are the realtime patches actually worth it?

14:12 <emily> also by "realtime on x86 is a shitshow" do you mean architecturally (because agreed ofc) or linux specifically?

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14:18 <whitequark> both

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14:18 <whitequark> the realtime patches are sufficiently worth it that they'll be mainline soon

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15:51 <marcan> emily: architecturally

15:51 <marcan> but also just in general there is Too Much Crap on a modern OS

15:51 <marcan> the RT patches do help though

15:52 <marcan> e.g. I've run emerge compiles while doing realtime audio stuff and it was fine

15:52 <marcan> but the devil of RT stuff is that the exceptional cases are what kill you

15:52 <marcan> sure, you can peg the CPUs with compute garbage and the RT side won't feel anything (as long as CPU throttling or the like don't screw you over)

15:52 <marcan> heck if anything the lack of idle modes will *help* RT stuff

15:52 <marcan> RT latencies go down when you burn CPU

15:53 <marcan> but then it's the little glitches where something holds the wrong mutex or something waits on something it shouldn't or some hardware misbehaves that get you

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16:00 <grazfather> sorear you asked two weeks ago where I had heard of glasgow. I think someone tweeted it.

16:00 <grazfather> to some article that mentioned it and the new bus pirate

16:04 <sorear> mm

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16:34 <Stormwind_mobile> Can someone tell me the max dara rate one can get piped through Glasgow?

16:37 <whitequark> about 30 MB/s

16:37 <whitequark> (sum in both directions)

16:37 <whitequark> that requires some real good alignment of stars though, and is only possible on Linux

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19:47 <electronic_eel> Stormwind_mobile: I constantly get numbers around 41 and 42 MByte/s when running "glasgow run benchmark"

19:48 <electronic_eel> this is on linux with a several years old cpu/mainboard (core i7-4771)

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21:30 <ktemkin> whitequark: I'm totally stealing your open-source intellectual property~ https://usercontent.irccloud-cdn.com/file/NR6RHkFB/leds_fpga.png https://usercontent.irccloud-cdn.com/file/EpMWLL0F/leds_uc.png

21:31 <ktemkin> (those are on LUNA; my forthcoming FPGA analyzer/multitool)

22:01 * gruetzkopf wonders how many people actually get that

22:06 <tnt> I definitely didn't get it before it was explicitely mentionned here ...

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22:09 <ZirconiumX> I mean, the colours are pretty obvious to me, but then I have a three foot long flag with those colours on

22:36 <davidc__> I only realized after grumbling about assembly costs + feeder counts (but, then again, I was looking at a BOM without any placement info)

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