Re: [9fans] listen qlen

[abhay puri <avp@one.net.au>]

Many thanks to all who answered the 'how to make the kernel' question.
It works and should be useful for lots more than this qlen question!

I took some time measurements where the client code is basically "connect,
send "GET /", close"

03 iterations
    linux2.2.14-15mdk/apache1.3.9   33 pkts  0.058, 0.056, 0.057
    p9/httpd 0.055, 0.055, 0.055
20 iterations
     linux2.2.14-15mdk/apache1.3.9  220 pkts  0.283, 0.284, 0.278
     p9/httpd    5-7 connection refused messages
     p9/httpd qlen=512    201 pkts  0.513, 0.380, 0.384
50 iterations
    linux2.2.14-15mdk/apache1.3.9    3.291, 3.294, 3.283
    linux2.2.14-15mdk/apache1.3.9 qlen=511   550 pkts 0.636, 0.655, 0.635
    p9/httpd qlen=512    0.994, 0.991, 1.007

Notes:
- except where explicitly stated, the listen qlen is 10.
- all times are in seconds and are calculated using tcpdump running on the
client
- the three times are three consecutive measurements
- the linux and p9 measurements are both taken from the same box which is a
p133 pc, 48Mb.

Questions:
I guess i have a couple of questions:
- the fact that p9/httpd started refusing connections at 20 iterations
  while linux didn't surprised me. (that may be more a linux question?)
- the fact that p9/httpd took half again as long (50 iterations) as linux
surprised me
  (this maybe too artificial a test - with no bearing on how a server would
actually perform ).
  Nevertheless, is this sort of difference expected?
  or is it likely I've stuffed something in my configuration up?