file descriptors for a proxy

[Murat Balaban <balaban_(_at_)_verisoft_(_dot_)_com_(_dot_)_tr>]

Hi, 
I am running an OpenBSD 2.7-stable as a gteway for my local net.
I also run squid which does transparent caching.

My problem is, after some time in my squid/cache.log,
i get `your cache is running out of file descriptors` error,
while the state of current/total f.desc. are as following

proxy:~# pstat -T
 887/1772 files
   1307 vnodes
Total                0        0        0     0%                              
proxy:~#

I plan to use a 512 MBs of cache.  How many file descriptors do you
suggest ? And can you please guide me how to change the # of f.desc.?
in squid-faq i have found some kinda answer, but wannted to be really sure
of what i am doing...

Thanx 

- Murat Balaban