Been trying trying settings for a couple of days, along with swap on SDcard partition.. It seems my N900 will reboot after a while when using SD swap - verified on stock kernel and SDswap only, may be due to the fact it is a 1st gen SANDisk 8Gb card and might not be fast enough, so I'm running tests using default eMMC swap and ramzswap.

Using 128mb cache the device was still responsive even during an update using HAM.. I now have it launched as an event.d script.
i will try the new settings and see how it goes, in particular if it affects battery life due to RAM usage instead of eMMC access.

Is it possible to launch this earlier in the boot process, as part of RCS_LATE?