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I have 5.5 GiB memory, using 2.8 GiB (~50%), but my swap is using 1.9 GiB of 5.6 GiB (~33%). My computer operates okay but is sluggish at times.

So is this a high amount of swap usage or completely normal?

 TOTAL USED % MEM 5.5 GiB 2.8 GiB 50% SWP 5.6 GiB 1.9 GiB 33% ----------------------------------------- TOTAL 11.1 GiB 4.7 GiB 83% Linux base 3.18.3-201.fc21.x86_64 #1 SMP Mon Jan 19 15:59:31 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux cat /proc/sys/vm/swappiness 60 //default

ran 

sudo sysctl -w vm.swappiness=10

but nothing happened yet.

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It is not important how much swap is ussed unless it is full. It is more important how much swap in swap out operations per second you have. Swapin/swapout can be monitored with vmstat, sar or dstat.

If swap is full and swapin/swapout operations are very low, you can just add more swap.

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