K.S. Bhaskar on 16 Apr 2015 07:02:00 -0700

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[PLUG] swappiness and ssd

The default swappiness on Ubuntu systems is 60, and presumably takes into consideration the relative performance of writes to and reads from the swap file / partition.  The ratio of write performance to read performance would be higher for SSDs than rotating media, since SSD reads are truly random whereas writes are in pages (in rotating media, seek and latency times would tend to apply to both).  Therefore, it seems to me that if swap is located on SSD, we should increase swappiness, to encourage less frequently used pages to be written out, since they can be brought back in very fast when needed.  Does that seem reasonable or am I missing something?  Thanks.

-- Bhaskar
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