PAE paging leads to random reboots/freezing using AMD-FX 6300 6-core processor
|Reported by:||nzimmermann||Owned by:||nobody|
|Has a Patch:||no||Platform:||x86|
My system consist of a AMD-FX 6300 6-core machine with 16GB DDR3 RAM and Haiku is installed os primary OS. The machine randomly reboots and/or freezes (this is more seldom) after a few minutes, when the system is under heavy load (compiling a large software project, using make -j 6).
I replaced the motherboard, CPU, RAM, power-supply etc, but things kept unstable. Finally, after playing with the safe mode settings I found a work-around: Enabling 4gb_memory_limit. (This was a suggestion from korli on ticket #10279).
In src/system/kernel/arch/x86/arch_vm_translation_map.cpp a decision is made based on this setting. PAE paging is disabled, and 32 bit paging is enabled. The paging method is switched from X86PagingMethodPAE to X86PagingMethod32Bit.
Using the latter paging method, my system is stable: no random reboots, no random binary crashes, nothing. I'm confident that the actual memory limit of 4 GB is not curing the problem, as I can reproduce the system reboots also when using only one RAM stick with 4 GB alone --> it must be the paging.
NOTE: Other people reported that the 4gb_memory_limit does not help with the random binary crashes (as stated on ticket #10279, by kallisti5), but in my case it does make the difference. Apparently in earlier days, the 4gb_memory_limit did NOT deactivate PAE paging, but nowadays it does.