vm swappiness with contest
From: Con Kolivas <[email protected]>
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Paolo if I was to choose a number from these values I'd suggest lower than 60 rather than higher, BUT that is because the io load effects become a real problem when the kernel is swappy - don't _really_ know what this means for the rest of the time. Maybe in the 40-50 range. There seems to be a knee (bend) in the curve (most noticable in
dbench_load) rather than the curves being linear. That knee I believe simply shows the way the algorithm for swappiness basically works. I might throw a 50 at the machine as well to see what that does.
Con, thank you for your time and results.
I have to confirm you that large file writes with a swappy kernel seems to waste time swapping data, I see it with the resp tool too.
May be we can say that a good value for a desktop enviroment is in the 40-50 range while for a server is 70-80, this because with the osdb bench tool I get the best results with 80.
Ciao,
Paolo
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