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v18 LibreELEC Testbuilds for x86_64 (Kodi 18.0)
I’ve noticed recent network lagging too. Intel NUCs. Seems to start around a week or so ago.

Edit: Maybe around the time Linux went to .19?
Post the kernel log using dmesg | pastebinit.

There has been reports of network performance issues in this thread, introduced wth 4.19-rc1, and there is a possible matching bug report but it doesn't look like anyone with the problem in this thread is interested in posting additional details to the bug so I'm not expecting a fix any time soon.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.
(2018-12-03, 01:56)Milhouse Wrote: Post the kernel log using dmesg | pastebinit.

There has been reports of network performance issues in this thread, introduced wth 4.19-rc1, and there is a possible matching bug report but it doesn't look like anyone with the problem in this thread is interested in posting additional details to the bug so I'm not expecting a fix any time soon.
So, stick with Milhouse build #1022. It works. The last stable LibreELEC builds work too. It looks like the LibreELEC Alpha builds also have this issue although I only saw one bug report.
(2018-12-03, 01:56)Milhouse Wrote: Post the kernel log using dmesg | pastebinit.

There has been reports of network performance issues in this thread, introduced wth 4.19-rc1, and there is a possible matching bug report but it doesn't look like anyone with the problem in this thread is interested in posting additional details to the bug so I'm not expecting a fix any time soon.
 I just reflashed LibreELEC-Generic.x86_64-9.0-Milhouse-20181201210245-#1201-g5dc77c9

Here is a link to the kernel log:
http://ix.io/1vay
(2018-12-03, 21:39)J.L.C. Wrote:
(2018-12-03, 01:56)Milhouse Wrote: Post the kernel log using dmesg | pastebinit.

There has been reports of network performance issues in this thread, introduced wth 4.19-rc1, and there is a possible matching bug report but it doesn't look like anyone with the problem in this thread is interested in posting additional details to the bug so I'm not expecting a fix any time soon.
 I just reflashed LibreELEC-Generic.x86_64-9.0-Milhouse-20181201210245-#1201-g5dc77c9

Here is a link to the kernel log:
http://ix.io/1vay

Yes, you have the same network related issue that is present since 4.19-rc1.

There is a bug for this, but nobody from this thread has posted anything relevant such as a before/after 4.19-rc1 dmesg logs. And no, a Kodi log is not relevant for a kernel issue.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.
New LibreELEC.tv Leia build #1203: Generic
(Supercedes previous build)

SHA256 Checksum: a698c8ee5d29229d22035bebbd7a42dcdd3888c352530f9733234659ed7626a7 (Generic)

# uname -a
Linux NUC 4.19.6 #1 SMP Mon Dec 3 21:36:35 GMT 2018 x86_64 GNU/Linux

# lsb_release
LibreELEC (Milhouse): devel-20181203213420-#1203-gbf8d34d [Build #1203]

# Kodi version
(18.0-RC3 Git:1de0d40). Platform: Linux x86 64-bit

Based on tip of LibreELEC.tv master (bf8d34d, changelog) and tip of XBMC master (1de0d40, changelog) with the following modifications: Build Highlights:
  1. bump to v18.0 rc3
  2. fix libcec and Samsung TVs (ping keydon + thanks!)
Build Details:
  1. LibreELEC.tv:
    • iptables: fix build with 3.10.y, remove hack (PR:3144, 1 commit, 2 files changed)
    • libssh: update to libssh-0.8.5 (PR:3138, 1 commit, 1 file changed)
  2. XBMC:
    • bump to v18.0 rc3 (PR:14978, 1 commit, 1 file changed)
  3. libcec:
    • fixed: only prevent TV polls when a Samsung TV is detected instead of suppressing all logical addresses. issue #424 #444 (f759324)
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.
(2018-12-04, 00:19)Milhouse Wrote: New LibreELEC.tv Leia build #1203:
[...]Build Details:
  • libcec:
    • fixed: only prevent TV polls when a Samsung TV is detected instead of suppressing all logical addresses. issue #424 #444 (f759324)
 
I can happily confirm, the libcec-fix is working for me.
Thank you for the excellent bugfix-experience.
please delete.
Milhouse, I know we've been trying your patience on this network problem using a 4.19 kernel, but I'm way out of my comfort/competency zone modifying syslinux.cfg via vi. Frankly, I wouldn't know how to begin to report a linux kernel bug but here is my best attempt to provide, as requested, two complete/untruncated (dmesg | pastebinit with log_buf_len=16M appended to the kernel command line)  kernel logs of 1016 and 1016x .
Perhaps someone more knowledgeable than me can take it from here.

http://ix.io/1vgP - 1016 kernel log

http://ix.io/1vgR - 1016x kernel log

If I've at least managed to do this first step correctly, I'll do my best to do what you ask to further diagnose the issue. 
If I've done it incorrectly, my apologies for wasting more of your time. Regardless, thanks for all you do.
@drebbe there's really nothing I can do, as it's a kernel bug/regression. I linked the bug in a previous post, someone needs to get involved with the kernel developers and post them their logs etc. as I don't have this issue myself. I don't want to get involved myself for that reason, as they'll generally ask me for information I don't have. If/when a fix is proposed I'm more than able to create a test build that includes it.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.
New LibreELEC.tv Leia build #1204: Generic
(Supercedes previous build)

SHA256 Checksum: 8c94c38737c73a58daa85f5a7c158364ca2ee1687829480231b16dee110b1c02 (Generic)

# uname -a
Linux NUC 4.19.6 #1 SMP Tue Dec 4 21:57:45 GMT 2018 x86_64 GNU/Linux

# lsb_release
LibreELEC (Milhouse): devel-20181204215607-#1204-g1f14e69 [Build #1204]

# Kodi version
(18.0-RC3 Git:1de0d40). Platform: Linux x86 64-bit

Based on tip of LibreELEC.tv master (1f14e69, changelog) and tip of XBMC master (1de0d40, changelog) with the following modifications: Build Highlights:
  1. Minors
Build Details:
  1. LibreELEC.tv:
    • fix .config/firmware handling (PR:3141, 2 commits, 3 files changed)
    • libretro-mgba: updated to git 38bad71 (PR:3134, 1 commit, 1 file changed)
  2. Additional commits/pull requests/changes not yet merged upstream:
    • Updated: [env] PR:3130 (perma): linux (RPi/Generic): update to linux-4.19.6
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.
(2018-12-05, 00:29)Milhouse Wrote: @drebbe there's really nothing I can do, as it's a kernel bug/regression. I linked the bug in a previous post, someone needs to get involved with the kernel developers and post them their logs etc. as I don't have this issue myself. I don't want to get involved myself for that reason, as they'll generally ask me for information I don't have. If/when a fix is proposed I'm more than able to create a test build that includes it.
 Ok. Thanks, I get it. Again, sincerely, thanks for all you do.
(2018-12-05, 00:29)Milhouse Wrote: @drebbe there's really nothing I can do, as it's a kernel bug/regression. I linked the bug in a previous post, someone needs to get involved with the kernel developers and post them their logs etc. as I don't have this issue myself. I don't want to get involved myself for that reason, as they'll generally ask me for information I don't have. If/when a fix is proposed I'm more than able to create a test build that includes it.
 if you're able to revert this commit, would be an easy way to test:  
https://git.kernel.org/pub/scm/linux/ker...a98ee7bd57

it looks like there's a few subsequent commits after which may make reversion require some massaging. If it's too much trouble, I'll try to build 8.90.008 here with that reverted and see how it goes
@matt Devo yes there have been a lot of changes in the area of r8169 which makes it difficult to revert commits from almost 6 months ago. If you have the time, bisecting 4.18.14...4.19-rc1 might be the best approach.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.
same Network Issue with 4.19 Kernel on my end.

4.19 http://ix.io/1vim
4.18 http://ix.io/1vil

I posted both on the linked Bug report, hope it helps
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LibreELEC Testbuilds for x86_64 (Kodi 18.0)4.524