**** BEGIN LOGGING AT Fri May 13 02:59:59 2016 May 13 07:13:54 hi, I have a question regarding the BBBs UART peripherals: I need a setup where I will be able to receive data on UART at around 1.5Mbps. For doing this, I have set the targeted port to use 1500000 baud. Everything works fine (I achieve the targeted speed) when I send and read big data chunks (~10000bytes) (in a loop, connecting TX and RX together), I obtain a ~1.4Mbps throughput! May 13 07:15:29 The problem is when I do the same thing with small data chunks (68bytes), because for some reason it takes very long time to read it back (the write operation is the same, as with big buffers). Why is this happening? May 13 07:17:12 Some more info: When I read the 68bytes chunk of data, it takes about: 00:00:00.197884 May 13 07:18:26 But when I do the same thing with 4094bytes buffers, it takes around 00:00:00.022609 May 13 07:19:27 sounds like you've discovered that there is overhead May 13 07:19:42 And also, the write operation is more slow: 00:00:00.004441 vs. 00:00:00.000462 May 13 07:20:27 @tbr: Is there any way to fix this? May 13 07:21:24 no idea, never had to work with high throughput UART on the BBB May 13 07:21:58 someone more knowledgeable might be able to point at what happens and what you could do May 13 07:22:35 IIRC there are different UART drivers, maybe testing the other one could help May 13 07:22:42 also which kernel are you on? May 13 07:22:59 3.8.13-bone70 May 13 07:23:08 Debian distro May 13 07:23:21 might want to try the recent 4.x kernels too May 13 07:24:13 I might give them a try, If I'm sure that the driver is faulty May 13 08:28:48 any ideas? May 13 08:34:50 anyone noticed if pm is broken in current mainline? cat /sys/power/state is empty ... May 13 08:40:44 on 4.0.0-bone0 it says it supports 'disk' - though I'm not sure if I'm going to believe that... May 13 08:45:26 only disk ? not mem ? was suspend-to-ram ever working on beaglebone? May 13 08:46:28 don't think so May 13 08:46:36 maybe in some ti kernel May 13 08:47:02 you could check on the TI 3.8.x 3.0.x and 3.14.x kernels May 13 08:47:57 bbl May 13 09:45:37 hi, I compiled qt project for beaglebone black. I had some issues/warnings like the mangling of 'va_list' has changed in GCC 4.4. Maybe some of you encountered these issues. May 13 09:46:01 NB: host:Debian ; target: BBB Debian Jessie May 13 09:46:18 NB : Qt 4 May 13 09:47:27 I can run the qt app but I would like to know the reason of these warnings May 13 10:02:45 dirkk: Qt4 is so last decade May 13 10:05:24 gcc4.4 .. that's last century lol May 13 10:05:34 I'm still running qt4 for now .. May 13 10:05:42 but I will be jumping to 5 Soon(tm) May 13 10:06:14 tbr: haha, so I'm not the only one. May 13 10:06:27 who run app with qt4 May 13 10:07:37 I understand that there are still issues with qt5 and arm arch, no ? May 13 10:09:10 huh? no May 13 10:09:38 there are products with Qt5 UI out that work rather well May 13 10:10:10 tbr: like? May 13 10:11:42 in the consumer space the Ubuntu Touch and Sailfish based devices May 13 10:12:22 they are probably under heavy development May 13 10:13:01 sailfish is currently on Qt5.2 and is pretty stable. May 13 10:13:17 no 'heavy development' especially not in the Qt libraries May 13 10:14:26 tbr: more thinking about the end-app end .. so that any issues are worked around :D May 13 10:14:26 tbr: didn't know. May 13 10:15:04 qt4 is pretty much dead, for quite long by now May 13 10:15:18 veremit: interesting to hear your feedback when you jump May 13 10:15:54 dirkk: my desktop system is KDE .. they've been qt5 in the plasma desktop for a while now May 13 10:16:04 so most apps are also Qt May 13 10:16:16 but I'm stuck in the older qt4 release May 13 10:17:02 my distro just stabilised and wrote upgrade docs for the newer version :) May 13 10:17:13 hence upgrade time May 13 10:17:23 but thats my amd64 system .. not Arm :D May 13 14:18:26 hi, any one have an idea how much power SGX PVR eats on bbb ? May 13 14:19:13 top OM NOM NOM NOM ? May 13 14:39:34 I have a custom image of a beaglebone black on an SD card that can flash any other BBB - works perfectly. But now when I put the SD card into a BB-Green and try to flash it, it gives me a corrupt filesystem and the BBG won't boot. Is there something special I have to do? I would like to have the exact same image running on both the Green and Black. Any clue what's up? May 13 16:39:55 How/where are old BBB images? I'm trying to find a debian 3.8.13-bone68 image? May 13 16:41:01 I guess the how doesn't make sense :) May 13 21:37:44 hello, I'm looking to see if I can get some help estimating RAM needs for a little project I'm doing. May 13 21:38:39 Basically, once the OS is installed, I'll also need to load up pygame.mixer and a python based program, pluse 3 MP3 files taking up ~200MB (so they can be played instantly) May 13 22:04:07 I don't think you have much of a choice as far as available RAM in concerned since it's all onboard May 13 22:05:06 the BBB only offers 512MB which is good for decent sized projects but if you need more, there's the BBEnhanced or one of the higher end boards May 13 22:55:48 That I'm aware of and that's fine, but I"m trying to find out if there's enough and I'm not sure what else needs to be accounted for May 13 22:57:20 so if its 512MB you can just subtract 200MB right away May 13 22:57:36 and then you can use free -m to track RAM usage on the BBB May 13 22:57:56 so you can see how much it uses in an idle state or running your programs May 13 23:00:40 so FYI if i reboot my BBB i have 260MB free May 13 23:01:08 but i'm pretty sure i'm losing like 100MB to services I'm not using because it was 360 *right* after reboot and then 20 seconds later dropped to 260 May 13 23:01:27 What OS are you using? May 13 23:01:55 I can basically cut out everything that's not what I want since it's being purpose built May 13 23:02:02 I figure I can cut a few things out yes? May 13 23:02:26 jessie May 13 23:02:48 Alright May 13 23:02:49 yeah absolutely, mine still has apache running May 13 23:02:50 and node May 13 23:02:56 okay good to know May 13 23:03:11 I'm trying to find out how much is reserved for pygame, but I can't seem to find it May 13 23:03:26 I guess I'll have to just load up a vbox and see what it tells me to estimate that :P May 13 23:04:11 http://www.marinamele.com/7-tips-to-time-python-scripts-and-control-memory-and-cpu-usage May 13 23:04:29 good luck May 13 23:06:30 hmmmm, I see May 13 23:06:33 This could be useful, thanks May 13 23:06:36 also http://unix.stackexchange.com/questions/87908/how-do-you-empty-the-buffers-and-cache-on-a-linux-system May 13 23:06:54 i've got 400mb after that May 13 23:07:00 nice! May 13 23:12:11 the OS you use and the services you choose to enable make a huge difference May 13 23:12:48 I figured as much May 13 23:12:50 I tried Arch at one point and it was as barebones as one can get, so I'd say it's good for projects May 13 23:13:15 I've got a good friend tha'ts very familiar with that, maybe they could help me further. May 13 23:13:17 Good to know May 13 23:13:33 I'm using Fedora configured as a home server at the moment and with some services like nginx and php-fpm, it's about 140MB maybe May 13 23:14:13 the Arch install instructions are actually really easy for the BBB: https://archlinuxarm.org/platforms/armv7/ti/beaglebone-black May 13 23:14:22 oooO! May 13 23:14:41 wouldn't recommend it if you need something stable for the long term, such as a server May 13 23:15:17 Nah, it's literally accepting 1 input and doing 3 different things (or nothing) depending upon what it is. May 13 23:15:24 SHould end up being a very small program I expect May 13 23:15:34 I'm more familiar with Arduino though, so I'm not certain :P May 13 23:15:49 Oh a quick question May 13 23:16:01 well then almost any OS should do - hopefully the debian libs will be up to date enough for you though May 13 23:16:41 Once I've got my OS installed and all my services going, does that value you've given include everything that's supposed to be running? Or just idling or what? May 13 23:17:31 it's idling but I have some cron jobs and php-fpm is relatively hefty compared to everything else I have running May 13 23:17:42 Okay, if that's the case I'm probably fine May 13 23:17:52 Fedora-Minimal was like <70MB fresh out the box from what I remember May 13 23:17:59 And as ayjay stated, of course my Mp3s that'll need to be loaded are already subtracted May 13 23:18:16 leaving me with 312MB which, sounds like it'll be enough May 13 23:18:38 I don't imagine the RAM being a bottleneck - if anything, it might be the CPU May 13 23:18:56 Hmmm, I guess I did kind of assume that May 13 23:19:09 (it wouldn't be) May 13 23:19:38 I figured a 1Ghz anything could run an Mp3 May 13 23:20:21 yeah it's more than enough for simple tasks May 13 23:20:44 you'll notice it mostly when doing larger tasks like upgrading a lot of packages or compiling May 13 23:20:55 Okay, well I'm probably fine then. Thanks so much :3 May 13 23:21:04 sure, hope it works out for you May 13 23:21:09 I'll let you know May 13 23:21:13 cool **** ENDING LOGGING AT Sat May 14 02:59:58 2016