> I still wonder, whether this problem occurs because of how thttpd does
> things, or how FreeBSD implements kqueue stuff, however, I am not sure

I take it you don't have any logs for 4.4?

 
> And one more question: out of kqread()/poll()/select() methods, which one
> is more likely to perform better, both under normal server access, and

Under normal load it doesn't matter. Under heavy load there can be no
comparison.
see:
http://www.kegel.com/dkftpbench/Poller_bench.html

This excerpt is the FreeBSD relevant portion:


With 1 active socket amongst 100, 1000, or 10000 total sockets,
waitAndDispatchEvents takes the following amount of wall-clock time, in
microseconds (lower is faster): 

On a single processor 600Mhz Pentium-III with 512MB of memory, running FreeBSD
4.x-STABLE (results contributed by Jonathan Lemon): 

     pipes    100    1000    10000   30000
    select     54       -        -       -
      poll     50     552    11559   35178
    kqueue      8       8        8       8

(Note: Jonathan also varied the number of active pipes, and found that kqueue's
time scaled linearly with that number, whereas poll's time scaled linearly with
number of total pipes.) 


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