Let`s imagine were having two mounted swap partitions.
Current situation, if im not going wrong is the next:
swapping to 1st partition, till there is a space on it
then swapping to the next one...
But if make two basic checks:
1) if these partitions are on different drives
2) i/o speed is approx the same
we can do parallel page writes/reads, therefore
in fact twicing swapping i/o...
sorry for my ugly english/lameness
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