I figured I should ping this, since I don't know that it was properly shown to the debian-kernel mailing list.
> Interestingly it still contains the following note in documentation: > Zswap is a new feature as of v3.11 and interacts heavily with > memory reclaim. This interaction has not been fully explored on > the large set of potential configurations and workloads that > exist. For this reason, zswap is a work in progress and should be > considered experimental. > Unless this is not anymore to be considered valid, then > CONFIG_ZSWAP_DEFAULT_ON could be switched on (which should be > possible since 5.7-rc1). I saw that as well. However, zswap has gone through a lot of changes since then: it is enabled by default on Arch at least, and possibly more distributions (I couldn't find the kernel config file for RedHat). The feature is still maintained, and appears to be bug-free. I'm having a hard time seeing the disadvantage of enabling it.
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