| Saturday, April 13th, 2019, 00:07 UTC | ||
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| [00:51:40] | jm|laptop: | hello |
| [00:53:04] | jm|laptop: | i have three very similar mythfrontends. All using the dmo packages. Two of them start mythfrontend quite swiftly but one quite recently started taking over one minute from invoking mythfrontend to displaying the menu. To rule out disk problems I have rebuilt the problematic frontend with a brand new SSD and it still seems to be happening. |
| [00:54:38] | jm|laptop: | Looking at the debug on the console from --loglevel debug a large part of the delay seems to be setting things like "2019-04–13 01:43:24.270772 D Setting Always display subtitles changed to 0" which are being achieved at many per second on the good frontends but are taking sometimes 800ms each on the problematic frontend. |
| [00:56:34] | jm|laptop: | This particular box is behind a wifi bridge but owing to the fact that it is able to playback 1080i "HD" from the backend suggests network latency is not the issue, coupled with the fact that iperf shows "[ 4] 0.0–10.1 sec 150 MBytes 124 Mbits/sec" between the problematic frontend and the backend server. |
| [00:58:53] | jm|laptop: | looking at the debug information there is no real "deadpoint" where anything slows down / stops for a bit, it just seems that the whole process is retarded somehow. |
| [00:59:10] | jm|laptop: | any pointers would be much appreciated :) |
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| [01:22:27] | mack-: | jm|laptop: my wild guess is the wifi is still the culprit and buffering 1080i playback is your friend. |
| [01:23:32] | mack-: | recent changes to radio noise are hard to notice, for example. |
| [01:23:51] | jm|laptop: | mack-: given that there are a load of silly short mysql requests rather than one nice long iperf at 125M/s? |
| [01:24:22] | jm|laptop: | I have been poking around. I have a lot of cruft in `settings` and `keybindings` |
| [01:24:53] | jm|laptop: | Query OK, 3385 rows affected (0.10 sec) |
| [01:25:00] | mack-: | if you can move the box or have a long cable, it would be easy to rule out |
| [01:28:14] | jm|laptop: | yep. I was just thinking that exact thing. :) |
| [01:28:39] | jm|laptop: | I also have Wifi Analyzer which I might look at |
| [01:29:38] | jm|laptop: | I swear these Apple Airport Extremes try to use the worst channels >.< |
| [01:34:01] | jm|laptop: | grr. A new 40MHz 2.4GHz AP I haven't seen before called "MESH" and "THomeSpot52X" both splewing across my channels |
| [01:35:58] | jm|laptop: | it wouldn't be an issue if this frontend was purely mythtv I'd just suffer the wait once and it'd be fine but it's used for other things too. :| |
| [01:48:09] | jm|laptop: | 2019-04–13 02:47:23.839472 D Setting Enable automatic Parental Level from rating changed to 0 |
| [01:48:09] | jm|laptop: | 2019-04–13 02:47:44.885527 N Registering Internal as a media playback plugin. |
| [01:48:17] | jm|laptop: | that's quite a lot of seconds. I wonder what happens there. |
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| [01:54:10] | jm|laptop: | I was about to decry how terribly normalised some of these tables/queries are but I realise I'll just be slapped down with "it's open source. Go fix it, then." |
| [01:55:00] | jm|laptop: | 378 separate prepared statements for keybinding settings alone |
| [01:56:06] | jm|laptop: | $tomorrow I might find me a long cable. Thanks for the input mack- |
| [01:56:34] | mack-: | keyed/indexed sql DBs are pretty fast even with lots of rows |
| [01:57:27] | mack-: | I have one wifi device that's in an iffy spot. I only have to move it about 8 inches away from the wall to get better signal. Might be as simple as that. |
| [01:58:30] | mack-: | the best thing I did for my myth system, though, was to put the db on SSD |
| [02:01:08] | jm|laptop: | mine is |
| [02:01:20] | jm|laptop: | and I agree :) |
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