Nasser Heidari


Freeradius checkval module

Filed under: Linux — Nasser Heidari @ 17:14


checkval NAS_IP {
item-name = NAS-IP-Address
check-name = NAS-IP-Address
data-type = ipaddr
nofound-reject = no

authorize {



And then we need A/V Pair for each user like this:

test Auth-Type := Local, User-Password := 123321, NAS-IP-Address :=


Kernel vfs_cache_pressure

Filed under: Linux — Nasser Heidari @ 18:02

vfs_cache_pressure Controls the tendency of the kernel to reclaim the memory which is used for caching of directory and inode objects.

At the default value of vfs_cache_pressure = 100 the kernel will attempt to reclaim dentries and inodes at a “fair” rate with respect to pagecache and swapcache reclaim. Decreasing vfs_cache_pressure causes the kernel to prefer to retain dentry and inode caches. Increasing vfs_cache_pressure beyond 100 causes the kernel to prefer to reclaim dentries and inodes.