Description of problem:
After enabling "powersave" profile, network interface very often loses link for 1.5-2.5 seconds. On profile "balance" network is stable.
[1713411.927023] r8169 0000:04:00.0 enp4s0: link down
[1713411.927090] lan: port 1(enp4s0) entered disabled state
[1713411.940953] r8169 0000:05:00.0 enp5s0: link down
[1713413.438907] r8169 0000:05:00.0 enp5s0: link up
[1713414.297172] r8169 0000:04:00.0 enp4s0: link up
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. tunedadm profile powersave
2. observe link flapping
3. tuneadm profile balanced
4. link does not flap
I did not found anything obvious wrt network configuration in "powersave" profile definition.
I previously reported the bug against kernel:
Just now I found tuned profile link.
Hi, this is probably caused by dynamic tuning switching network interface speed according to its utilization. You can switch it globally off by setting:
dynamic_tuning = 0
in /etc/tuned/tuned-main.conf. AFAIK it can save few mW of energy, but it can also cause trouble with some network adapters. In next tuned release (hopefully 2.6) there is planned more fine grained configuration option which should allow switching it off only for network plugin.
Bingo! After disabling dynamic tuning link no longer flaps (no matter which profile is selected). Thank you.
Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 is
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