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Operating Systems Linux Need assistance to enable more that 4GB RAM on Linux 32Bit OS. Post 302430117 by mark54g on Wednesday 16th of June 2010 03:49:27 PM
Old 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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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)
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