To: NetBSD -current Mailing List <current-users@NetBSD.ORG>
From: Sean Sweda <firstname.lastname@example.org>
Date: 02/19/1998 19:20:58
This may be specific to port-mac68k, but when I posted to that
list nobody bothered to respond...
I tried to increase the size of the buffer cache, using the following
kernel config options:
So instead of getting 204 pages using 835584 bytes, I should get
512 pages using 2097152 bytes. However, from what I can tell, this
does not work properly. I've traced the "problem" to this line of
code in /usr/src/sys/arch/mac68k/mac68k/machdep.c:
if (bufpages == 0)
if (physmem < btoc(2 * 1024 * 1024))
bufpages = physmem / 10 / CLSIZE;
bufpages = (btoc(2 * 1024 * 1024) + physmem) / 20 / CLSIZE;
bufpages = min(NKMEMCLUSTERS * 2 / 5, bufpages);
What is this NKMEMCLUSTERS constant? Where does it get set? Why does
it override the BUFPAGES option?
here is the brief description in the options man page:
number of slots in the kernel submap "kmem_map". [Better description,
please? Chris CGD had some comments that I didn't understand.] Default is
<look this up>. Increase this value if you get "out of space in
So, what's going on here?
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