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From: Andrew A. Vasilyev <andy@snm.demos.su>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: What good are extra vnodes?
Date: 2 Oct 1996 11:47:03 GMT
Organization: Demos Online Service
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Caffiene Dependent <seventek@nntp.best.com> wrote:
> As I wasoptimizing my kernel today I noticed an option in the LINT
> configration allowing one to create extra vnodes. What are they and why
> would you want more(how many are there by default)?
If you have a lot of memory (say, extra 20-30M) and a busy
news/WWW/... service, you can now keep all vnodes permanently
in RAM and access any directory in a flick. We've tested
"options EXTRAVNODES=30000" and got an excellent result (the
same I've seen in Solaris :) - the only issue (except broken
mmap() :-{) why our newsserver was behind under FreeBSD compared
with Solaris).
And a relative question: could anyone "CoreTeamed" explain me how
to choose NBUF; is there any reason to increase it? Assuming one
has a lot of I/O operations on 100-1000,000 files FS? Or dynamic
cache does the best?
________
ANDY