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Operating Systems Linux Linux cache
# 1  
Old 05-06-2008
Linux cache
Hi all
I am trying to understand the kernel memory management and require assistance in this regard. Kernel first creates the cache memory to perform any subsequent allocation to processes. I could not figure out how it is accomplished. Do kernel directly allocates any hardware cache or allocates a portion of ram and then try to use it again and again..?

i also read that for efficient memory management in large processes the process has to create its own cache..How can we allocate this large chunk of generic memory..

Thanks for any feedbacks
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LEARN ABOUT HPUX

nbuf

dbc_max_pct(5)							     OBSOLETED							    dbc_max_pct(5)

NAME

       dbc_max_pct, dbc_min_pct, bufcache_max_pct, bufpages, nbuf - OBSOLETED kernel tunable parameter

DESCRIPTION

       These tunables have been obsoleted and removed.	Do not make any changes to these tunables, as they have no effect on the kernel.

       Use the file cache tunables and (see filecache_max(5)).

       In  previous  releases, the tunables and were used to set limits to the dynamic buffer cache, and the tunables and were used for tuning the
       buffer cache when a static cache was desired.

       This release of HP-UX offers improved file caching technology and improved physical memory control associated to  caching  file	I/O  data.
       The  number  of tunable parameters used to control file caching memory usage is reduced from five to two, and previous usability issues are
       addressed.

   Restrictions on Changing
       These tunables should not be modified.  Attempting to tune any of the obsolete buffer cache tunables, or results in an error.

       Use the tunables and to set limits on the file cache.  Note that, on a any given system, the optimum values of these two new  tunables  are
       not necessarily equivalent to the optimum values of the obsolete buffer cache tunable values in the older systems.  You should first deter-
       mine if the new default values yield acceptable performance on your system, before attempting to change the values of the  new  file  cache
       tunables.

AUTHOR

       and were developed by HP.

SEE ALSO

       filecache_max(5).

							     Kernel Tunable Parameter						    dbc_max_pct(5)