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  1. Bug #2049991
  2. Comment #0

Comment 0 for bug 2049991

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Eugene San (eugenesan) wrote : zswap is not working on 6.5

I recently migrated to Mantic from Jammy and noticed that 6.5.0 has "DEAD" zswap.

Everything seems normal, all the parameters and no error msgs but frontswap stays 0k at all times and everything gets swapped directly to disk.
No usage is reported in /sys/module/zswap/parameters and /sys/kernel/debug/zswap.

Jammy with HWE 6.2.0 and Mantic with https://kernel.ubuntu.com/mainline/v6.6.13/ and https://kernel.ubuntu.com/mainline/v6.7.1/ work fine.

I was able to reproduce the issue with https://kernel.ubuntu.com/mainline/v6.5.3/.
(I would try the latest https://kernel.ubuntu.com/mainline/v6.5.13/ but the build failed due building host issues.)

Seems like an upstream problem but not sure how to resolve it since Upstream 6.5 is abandoned and Jammy/Mantic 6.6 is months away...