*BSD News Article 80048


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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: What good are extra vnodes?
Date: 5 Oct 1996 17:05:05 GMT
Organization: Private BSD site, Dresden
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Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
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Andrew A. Vasilyev <andy@snm.demos.su> wrote:

>    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).

Btw., the mmap() in -current is said to be no longer broken.  However,
it now triggers a brokeness in the usage of mmap() in INN.  (IIRC, INN
tries to change the size of the active file while it's being mmap'ed.)

>   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?

Normally, the dynamic cache should be sufficient for you.  I think,
David Greenman has answered this question in the hackers list
recently.  Go digging in the mailing list archives for the exact
answer.

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)