freebsd-questions-local at be-well.ilk.org
Mon Feb 12 15:17:26 UTC 2007
Cy Schubert <Cy.Schubert at komquats.com> writes:
> I have a question about tuning FreeBSD systems, specifically in regard to
> memory. At one time on Solaris systems it was recommended to keep scan rate
> below 200 pages per second. (Today it's 300 pages per second, dependent on
> the amount of memory, class of system.) Are there any recommendations or
> rules of thumb a person can use to determine when a memory upgrade is
> required? My machines are only busy during port builds when the scan rate
> can vary greatly and the page out rate could reach as high as two pages per
> second during brief periods. What kind of memory and paging metrics should
> I use on FreeBSD systems?
I'm not convinced that such a simple algorithm makes sense these days.
If the system is normally pretty quiet, then it is unlikely you'll see
any difference from optimizing memory behaviour further.
I believe that when top(1) gives memory sizes, they are in bytes
rather than pages as the manual indicates.
Lowell Gilbert, embedded/networking software engineer, Boston area
More information about the freebsd-questions