Memory Mangement Problem in 5.1-RELEASE
wmoran at potentialtech.com
Thu Jul 24 12:53:23 PDT 2003
Ahmed Al-Hindawi wrote:
> I have 160Mb of SDRAM (PC100) on a 233Mhz CyrixInstead machine and I
> seem to have memory mangament problems. The BIOS indicates I have 160,
> so does the BSD bootstrap program.
> When I launch GNOME 2.2 everythings is good as gold untill I open the
> System monitor program. It says that I have 149 Mb of RAM which is fine
> ( 4Mb of video..and the rest...god knows).
> I open every program I have and after 107Mb the machine starts to swap
> with about 50Mb left unused!!
> I recompliled the GENERIC kernal for the sake of it really (Im still an
> amature) I didn't mess with the configuration files or anything (I just
> don't know how!!).
> Is this normal or mismanagement of memory in the 5.1 version of the
> excellent FreeBSD kernel??
The mistake is in the way the Gnome System Monitor display the free memory.
I just watched both 'top' and the System Monitor as I opened program after
program until the system started swapping, and System monitor reports
almost 100M free while top reported less than 10M.
To _always_ have a little memory free is A Good Thing(tm). FreeBSD has
some pretty advanced memory management that will start swapping _before_
the system runs out of RAM. However, the System Monitor's display of
this is simply inaccurate. There was NOT 100M free when it started swapping
on my system.
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