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Swap is somehow super slow on xubuntu. I have 8GB ram running vivid 15.04 Xubuntu. When ram usage reaches around 7+gb ... the hdd light goes crazy (actually, it just stays on) and stuffs get dumped into the swap partition (16GB).

Question: Why does the whole system go frozen when this happen?

My sysctl settings are:

  • vm.dirty_background_ratio = 5
  • vm.dirty_ratio = 20
  • vm.swappiness = 20
  • vm.vfs_cache_pressure = 50
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  • Have you tried a higher swapiness? Maybe 60? 100? Are you using so much RAM in a single, or multiple applications?
    – earthmeLon
    Jun 16, 2015 at 3:36
  • Yes, I am using that much ram, that is why swap kicked in to begin with. I've tried different level of swappiness, but not 100. Let me try 100 and post an update.
    – Observer
    Jun 16, 2015 at 3:38
  • I specifically meant, "Do you believe that there is a single application using quite a lot of RAM, or do you have many small things using this much RAM?".
    – earthmeLon
    Jun 16, 2015 at 3:43
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    swap is always slower then RAM and you either need to reduce your RAM use of purchase more RAM.
    – Panther
    Jun 16, 2015 at 3:46
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    @bodhi.zazen, thanks for the insight, the satori! Why didn't I think of that? The strange thing is, the ram to swap partition seem to be slower than file copy itself.
    – Observer
    Jun 16, 2015 at 10:22

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