06-16-2010
The performance impact is highly workload dependent, but on a fairly typical kernel compile,the PAE penalty works out to be around a 1% performance hit on RedHat’s test boxes.Testing with various other workload mixes has given performance
hits ranging from 0% to 10%.
From Redhat's 2.1 Virtual memory white paper. Things may have changed slightly in 2.6, but as such, it will still produce a slight performance hit.
Last edited by mark54g; 06-16-2010 at 10:52 PM..
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LEARN ABOUT HPUX
cachefsstat
cachefsstat(1M) cachefsstat(1M)
NAME
cachefsstat - Cache File System statistics
SYNOPSIS
path... ]
DESCRIPTION
The command displays statistical information about the cache filesystem mounted on path. The statistical information includes cache hits
and misses, consistency checking, and modification operations. If path is not specified, all mounted cache filesystems are used. can also
be used to reinitialize this information (see description for the option). The statistical information has the following format:
<cache hit rate>
<consistency checks>
<modifies>
where each of the above is defined as:
cache hit rate
The percentage of cache hits over the total number of attempts followed by the actual numbers of hits and misses.
consistency checks
The number of consistency checks performed followed by the number that passed and the number that failed.
modifies The number of modify operations, including writes, creates, and so on.
Options
recognizes the following option:
Zero (reinitialize) statistics.
Execute before executing again to gather statistics on the cache performance. This option can only be used by the supe-
ruser. The statistics printed reflect those just before the statistics are reinitialized.
RETURN VALUE
returns the following values:
Success.
non-zero An error occurred.
EXAMPLES
AUTHOR
was developed by Sun Microsystems, Inc.
SEE ALSO
cfsadmin(1M).
cachefsstat(1M)