Recently I upgraded my Lemote Box to 512M main memory. 256M is indeed a little small for GNOME. As current 32bit kernel do not support memory larger than 256M (If you can solve it, just contact Lemote and get one machine!), I was forced to use 64bit kernel. It no longer freezes.
Talked with foxsen and he agrees. His Loongson laptop is with 512M memory and never dumps. But his Loongson Box with 32bit kernel did freeze once.
Waiting for explanations and solutions.