RHEL Kernel Performance Optimization, Characterization ... - Red Hat

RHEL3 /proc/sys/vm/pagecachepagecache.minpercent●●Lower limit for pagecache page reclaiming.Kswapd will stop reclaiming pagecache pages below this percent ofRAM.pagecache.borrowpercnet●Kswapd attempts to keep the pagecache at this percent or RAMpagecache.maxpercent●●●●Upper limit for pagecache page reclaiming.RHEL2.1 – hardlimit, pagecache will not grow above this percent of RAM.RHEL3 – kswapd only reclaims pagecache pages above this percent ofRAM.Increasing maxpercent will increase swappingExample: echo “1 10 50” > /proc/sys/vm/pagecache