[Bug 1854961] Re: subiquity download progress-bar on s390x swamps console messages and buffer

Mon Dec 16 08:57:33 UTC 2019

I just updated the installation environment to the latest daily image (timestamp Dec 15th 2019):
"Ubuntu-Server 20.04 LTS _Focal Fossa_ - Alpha s390x (20191215)"
that includes subiquity 19.12.1 and can confirm that the issue reported here (with the huge amount of download progress update lines) does not exist anymore.
Thx for solving this!

I'll change the project entry to Fix Released.
The Focal entry can be changed to Fix Released, too (in my opinion).
And I think we can set Eoan to Won't Fix, since the default installer for Eoan (on s390x) was still d-i, and the live image for Eoan (s390x) was always considered as experimental. 

** Changed in: ubuntu-z-systems
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1854961

Title:
  subiquity download progress-bar on s390x swamps console messages and
  buffer

Status in subiquity:
  Invalid
Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in casper package in Ubuntu:
  Fix Committed
Status in casper source package in Eoan:
  Confirmed

Bug description:
  The challenge here is that due to the limited functionality in the IBM Z and LinuxONE console ("Operating System Messages" task)
  a progress-bar is not replacing it's current line with an updated progress (consuming just a single line), but just instead prints a new line on every update.
  Hence one line per update is printed and in case of high update intervalls that swamps the console buffer and leads to partly unresponsive (browser-based) console window (probably due to the high amount of data).

  As an example we have here 145 lines, and with that updates, for the
  "8%" download status - that makes up about 1500 lines in total for the
  entire download (100%).

  "57950K .......... .......... .......... ..........  8% 93.1M 6s"
  "58000K .......... .......... .......... ..........  8%  142M 6s"
  "58050K .......... .......... .......... ..........  8%  107M 6s"
  "58100K .......... .......... .......... ..........  8%  110M 6s"
  "58150K .......... .......... .......... ..........  8%  129M 6s"
  "58200K .......... .......... .......... ..........  8% 98.8M 6s"
  "58250K .......... .......... .......... ..........  8%  111M 6s"
  "58300K .......... .......... .......... ..........  8% 91.6M 6s"
  "58350K .......... .......... .......... ..........  8%  119M 6s"
  "58400K .......... .......... .......... ..........  8%  166M 6s"
  "58450K .......... .......... .......... ..........  8% 81.2M 6s"
  "58500K .......... .......... .......... ..........  8%  139M 6s"
  "58550K .......... .......... .......... ..........  8% 95.8M 6s"
  "58600K .......... .......... .......... ..........  8%  149M 6s"
  "58650K .......... .......... .......... ..........  8% 85.6M 6s"
  "58700K .......... .......... .......... ..........  8%  144M 6s"
  "58750K .......... .......... .......... ..........  8%  105M 6s"
  "58800K .......... .......... .......... ..........  8%  136M 6s"
  "58850K .......... .......... .......... ..........  8% 81.4M 6s"
  "58900K .......... .......... .......... ..........  8% 71.7M 6s"
  "58950K .......... .......... .......... ..........  8% 6.59M 6s"
  "59000K .......... .......... .......... ..........  8% 9.40M 6s"
  "59050K .......... .......... .......... ..........  8%  103M 6s"
  "59100K .......... .......... .......... ..........  8%  138M 6s"
  "59150K .......... .......... .......... ..........  8% 85.4M 6s"
  "59200K .......... .......... .......... ..........  8%  133M 6s"
  "59250K .......... .......... .......... ..........  8%  131M 6s"
  "59300K .......... .......... .......... ..........  8%  107M 6s"
  "59350K .......... .......... .......... ..........  8%  115M 6s"
  "59400K .......... .......... .......... ..........  8%  107M 6s"
  "59450K .......... .......... .......... ..........  8%  100M 6s"
  "59500K .......... .......... .......... ..........  8%  111M 6s"
  "59550K .......... .......... .......... ..........  8%  125M 6s"
  "59600K .......... .......... .......... ..........  8%  107M 6s"
  "59650K .......... .......... .......... ..........  8%  116M 6s"
  "59700K .......... .......... .......... ..........  8% 85.2M 6s"
  "59750K .......... .......... .......... ..........  8%  151M 6s"
  "59800K .......... .......... .......... ..........  8%  108M 6s"
  "59850K .......... .......... .......... ..........  8%  114M 6s"
  "59900K .......... .......... .......... ..........  8%  100M 6s"
  "59950K .......... .......... .......... ..........  8%  133M 6s"
  "60000K .......... .......... .......... ..........  8%  111M 6s"
  "60050K .......... .......... .......... ..........  8%  125M 6s"
  "60100K .......... .......... .......... ..........  8% 83.9M 6s"
  "60150K .......... .......... .......... ..........  8%  108M 6s"
  "60200K .......... .......... .......... ..........  8% 97.6M 6s"
  "60250K .......... .......... .......... ..........  8%  131M 6s"
  "60300K .......... .......... .......... ..........  8%  110M 6s"
  "60350K .......... .......... .......... ..........  8% 96.1M 6s"
  "60400K .......... .......... .......... ..........  8%  166M 6s"
  "60450K .......... .......... .......... ..........  8% 98.7M 6s"
  "60500K .......... .......... .......... ..........  8%  130M 6s"
  "60550K .......... .......... .......... ..........  8% 94.0M 6s"
  "60600K .......... .......... .......... ..........  8%  100M 6s"
  "60650K .......... .......... .......... ..........  8%  154M 6s"
  "60700K .......... .......... .......... ..........  8% 99.0M 6s"
  "60750K .......... .......... .......... ..........  8%  153M 6s"
  "60800K .......... .......... .......... ..........  8% 84.8M 6s"
  "60850K .......... .......... .......... ..........  8%  107M 6s"
  "60900K .......... .......... .......... ..........  8%  152M 6s"
  "60950K .......... .......... .......... ..........  8% 96.1M 6s"
  "61000K .......... .......... .......... ..........  8%  156M 6s"
  "61050K .......... .......... .......... ..........  8%  105M 6s"
  "61100K .......... .......... .......... ..........  8% 76.0M 6s"
  "61150K .......... .......... .......... ..........  8%  178M 6s"
  "61200K .......... .......... .......... ..........  8%  125M 6s"
  "61250K .......... .......... .......... ..........  8% 95.2M 6s"
  "61300K .......... .......... .......... ..........  8%  144M 6s"
  "61350K .......... .......... .......... ..........  8% 76.9M 6s"
  "61400K .......... .......... .......... ..........  8%  136M 6s"
  "61450K .......... .......... .......... ..........  8%  125M 6s"
  "61500K .......... .......... .......... ..........  8%  135M 6s"
  "61550K .......... .......... .......... ..........  8% 85.7M 6s"
  "61600K .......... .......... .......... ..........  8%  112M 6s"
  "61650K .......... .......... .......... ..........  8%  143M 6s"
  "61700K .......... .......... .......... ..........  8%  105M 6s"
  "61750K .......... .......... .......... ..........  8% 92.0M 6s"
  "61800K .......... .......... .......... ..........  8%  141M 6s"
  "61850K .......... .......... .......... ..........  8%  105M 6s"
  "61900K .......... .......... .......... ..........  8% 98.5M 6s"
  "61950K .......... .......... .......... ..........  8%  127M 6s"
  "62000K .......... .......... .......... ..........  8% 96.2M 6s"
  "62050K .......... .......... .......... ..........  8%  117M 6s"
  "62100K .......... .......... .......... ..........  8%  106M 6s"
  "62150K .......... .......... .......... ..........  8%  116M 6s"
  "62200K .......... .......... .......... ..........  8%  102M 6s"
  "62250K .......... .......... .......... ..........  8%  142M 6s"
  "62300K .......... .......... .......... ..........  8%  112M 6s"
  "62350K .......... .......... .......... ..........  8%  110M 6s"
  "62400K .......... .......... .......... ..........  8%  134M 6s"
  "62450K .......... .......... .......... ..........  8% 77.5M 6s"
  "62500K .......... .......... .......... ..........  8% 63.3M 6s"
  "62550K .......... .......... .......... ..........  8%  168M 6s"
  "62600K .......... .......... .......... ..........  8% 97.4M 6s"
  "62650K .......... .......... .......... ..........  8%  151M 6s"
  "62700K .......... .......... .......... ..........  8% 90.1M 6s"
  "62750K .......... .......... .......... ..........  8%  104M 6s"
  "62800K .......... .......... .......... ..........  8%  111M 6s"
  "62850K .......... .......... .......... ..........  8%  133M 6s"
  "62900K .......... .......... .......... ..........  8%  115M 6s"
  "62950K .......... .......... .......... ..........  8% 75.4M 6s"
  "63000K .......... .......... .......... ..........  8%  169M 6s"
  "63050K .......... .......... .......... ..........  8%  108M 6s"
  "63100K .......... .......... .......... ..........  8%  127M 6s"
  "63150K .......... .......... .......... ..........  8%  121M 6s"
  "63200K .......... .......... .......... ..........  8% 86.6M 6s"
  "63250K .......... .......... .......... ..........  8%  121M 6s"
  "63300K .......... .......... .......... ..........  8%  126M 6s"
  "63350K .......... .......... .......... ..........  8% 95.9M 6s"
  "63400K .......... .......... .......... ..........  8% 95.5M 6s"
  "63450K .......... .......... .......... ..........  8%  128M 6s"
  "63500K .......... .......... .......... ..........  8% 94.6M 6s"
  "63550K .......... .......... .......... ..........  8%  170M 6s"
  "63600K .......... .......... .......... ..........  8%  123M 6s"
  "63650K .......... .......... .......... ..........  8% 91.6M 6s"
  "63700K .......... .......... .......... ..........  8% 94.3M 6s"
  "63750K .......... .......... .......... ..........  8%  151M 6s"
  "63800K .......... .......... .......... ..........  8%  118M 6s"
  "63850K .......... .......... .......... ..........  8%  116M 6s"
  "63900K .......... .......... .......... ..........  8% 79.4M 6s"
  "63950K .......... .......... .......... ..........  8%  135M 6s"
  "64000K .......... .......... .......... ..........  8%  129M 6s"
  "64050K .......... .......... .......... ..........  8%  111M 6s"
  "64100K .......... .......... .......... ..........  8% 93.3M 6s"
  "64150K .......... .......... .......... ..........  8%  143M 6s"
  "64200K .......... .......... .......... ..........  8%  104M 6s"
  "64250K .......... .......... .......... ..........  8%  110M 6s"
  "64300K .......... .......... .......... ..........  8%  142M 6s"
  "64350K .......... .......... .......... ..........  8% 73.3M 6s"
  "64400K .......... .......... .......... ..........  8%  127M 6s"
  "64450K .......... .......... .......... ..........  8%  105M 6s"
  "64500K .......... .......... .......... ..........  8%  148M 6s"
  "64550K .......... .......... .......... ..........  8%  122M 6s"
  "64600K .......... .......... .......... ..........  8% 75.7M 6s"
  "64650K .......... .......... .......... ..........  8%  186M 6s"
  "64700K .......... .......... .......... ..........  8%  102M 6s"
  "64750K .......... .......... .......... ..........  8%  120M 6s"
  "64800K .......... .......... .......... ..........  8%  122M 6s"
  "64850K .......... .......... .......... ..........  8% 82.4M 6s"
  "64900K .......... .......... .......... ..........  8% 98.9M 6s"
  "64950K .......... .......... .......... ..........  8% 19.0M 6s"
  "65000K .......... .......... .......... ..........  8% 3.04M 6s"
  "65050K .......... .......... .......... ..........  8%  177M 6s"
  "65100K .......... .......... .......... ..........  8% 84.0M 6s"
  "65150K .......... .......... .......... ..........  8%  150M 6s"

  And since more lines got produced than the entire console buffer can store, it results in the fact that the initial/first lines can not be reached while scrolling up.
  (In fact the 'oldest' msg one can get back to is roughly:
   22250K .......... .......... .......... .......... 99% 79.2M 0s
  )

  A quick solution would be to reduce the update interval of that
  download progress-bar - e.g. by 150:1 (if possible) .

  In the early boot phase it lokks nicer - just a few lines are
  displayed:

  "host   : s1lp14"
  "rootserver: 0.0.0.0 rootpath:"
  "filename  :"
  "Connecting to 10.13.0.2:21 (10.13.0.2:21)"
  "focal-live-server-s3   4% |*                               | 28.7M  0:00:23 ETA"
  "focal-live-server-s3  16% |*****                           |  115M  0:00:10 ETA"
  "focal-live-server-s3  27% |********                        |  196M  0:00:07 ETA"
  "focal-live-server-s3  38% |************                    |  275M  0:00:06 ETA"
  "focal-live-server-s3  50% |****************                |  360M  0:00:04 ETA"
  "focal-live-server-s3  63% |********************            |  445M  0:00:03 ETA"
  "focal-live-server-s3  75% |************************        |  533M  0:00:02 ETA"
  "focal-live-server-s3  91% |*****************************   |  645M  0:00:00 ETA"
  "focal-live-server-s3 100% |********************************|  707M  0:00:00 ETA"

  See attachment for an almost entire console boot-up log ...

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