Man, I just wonder how much write I/O you should have on a modern-day system with let's say 2GB of RAM, so that the dirty cache would cause a significant memory pressure? I mean, before pdflush wakes up and writes them back???
On my desktop system with 1 GB RAM, apache server with a PHP application for network monitoring that does lots of mysql INSERTs, 2 testing tomcat5 instances, KDE, evolution and firefox running, according to /proc/meminfo, the memory occupied by dirty pages rarely exceed 10MB...
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