Through an explanation about memory management in Linux on the Gentoo Wiki, I was lead to an article on KernelTrap about High Memory In The Linux Kernel. Though I'm still not sure, this leads me to believe Oracle compiles the kernel with the CONFIG_HIGHMEM4G=y switch on and thus the 3 GB RAM for user space application should be in place. However, I'm forced to test this to make sure. :)
I've been playing a bit with the nscd now and want to share some tips related to tuning the nscd.conf file. To see how the DNS cache is doing, use nscd -g. nscd configuration: 0 server debug level 26m 57s server runtime 5 current number of threads 32 maximum number of threads 0 number of times clients had to wait yes paranoia mode enabled 3600 restart internal passwd cache: no cache is enabled [other zero output removed] group cache: no cache is enabled [other zero output removed] hosts cache: yes cache is enabled yes cache is persistent yes cache is shared 211 suggested size <==== 216064 total data pool size 1144 used data pool size 3600 seconds time to live for positive entries <==== 20 seconds time to live for negative entries
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