On 20/02/06, Hannah Schroeter <[EMAIL PROTECTED]> wrote: > Hello! > > On Mon, Feb 20, 2006 at 02:49:01PM +0000, Constantine A. Murenin wrote: > >[...] > > >> If this is a common state of affairs, you can always raise the > >> percentage of memory used for the buffer cache in the kernel, using > >> config -e: config -e -o /bsd.new /bsd > >> then the command > >> cachepct [number] Show/change BUFCACHEPERCENT > >> helps. The default is 5, you could raise it to 10 or even more. > > >Thanks, I think this is indeed an option I was looking for (however, > >it looks like I was looking for it in the wrong place -- `sysctl kern` > >tree). > > This can't be changed during run-time.
Yes, after not finding it in sysctl kern, I now see that one can't change it at runtime. :-( > >Although the documentation says that it defaults to 5%, it actually > >seems to default to 10% on amd64, alpha, hppa and hppa64. > > >Why it's not made to default to 10% on i386 too if enough memory is > >available? > > Others need more memory for running programs than you might need. > > >Also, it looks like "Filesystem Buffer" was in the FAQ in 2003-05-01 > >(http://www.se.openbsd.org/faq/faq11.html), stating "option > >BUFCACHEPERCENT=30" for config(8), but now it no longer appears in > >today's version (http://www.openbsd.org/faq/faq11.html). Is there a > >reason for that? > > Because that's not longer the recommended way. The recommendation is > to use GENERIC and at most customize it with config -e. Of course, > option BUFCACHEPERCENT=... still works, but is not officially supported, > like any building of custom kernels. The old FAQ lists "option BUFCACHEPERCENT=..." as a command to config -e, not as a compile option, so it's still unclear why the useful entry was removed from the FAQ. Cheers, Constantine.
