Viewing namei cache activity

The effectiveness of the system's namei caches can be seen
using sar -n:

   23:59:44  c_hits cmisses (hit %)
   23:59:49     869       0  (100%)
   23:59:54    1091       6  ( 99%)
   23:59:59     832       0  (100%)
   

   Average      931       2  (100%)

cmisses indicates the number of pathname

components that were not found in the namei cache and subsequently required that the information be read from one of the disk drives.

hit % gives the percentage of the

total number of pathname components referenced that were found in the namei cache.

See ``Reducing disk I/O by increasing the size of the namei cache'' for more information about tuning the namei cache.