I have a linux-2.6.19.2 board with an MPC880 with 16MB ram and 16 MB flash. Normally I have 9-10 MB of free RAM. If I allocate 5 MB of ram memory, the system continues to work normally, but if, instead of allocating 5 MB directly, I fill the /tmp directory (that has a tmpfs file system) with a 5MB file the system becomes slow and after some minutes the oom_killer is invoked. Before it dies I had the time to see that mtdblockd is taking a lot of CPU (20%), what could be the problem? Any hint will be appreciate, Bye, Antonio.
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