Duh, this is weird.

A few weeks ago I was whining here about my brand new N900, which featured unexpected reboots when overclocked above 600 MHz (yes, a couple reboots even at 700 MHz, and yes, reboots even in "ideal" settings... reboots almost always happening when accessing the 32Mb eMMC).

I now found that these commands did not yet show any unexpected reboot (at least in the last 4 days):

kernel-config load lv
kernel-config limits 250 850

Today I was able to backup 3+Gb movies via rsync on wifi at 1.3-1.4 megabytes/sec sustained speed (three times faster than USB networking) without experiencing reboots.