Re: [SQU] a question about refreshing

Squid can only control the refresh rate based on time, not number of
requests. See refresh_pattern.

A busy server needs to have quite a bit of TIME_WAIT per TCP definitions
(one per connection, stays for the duration of 2*MSL). How many do you
have? Quite normal numbers for a buzy server are a couple of thousands.
A standard Linux installation without any tuning is capable to handle
about 4000 TIME_WAIT sockets (the exact figure varies with traffic
pattern).

Most OS:es can be tuned to allow for more local sockets if you run out
of ports due to TIME_WAIT. On some you can also bend the TCP rules by
lowering the time a socket stays in TCP_WAIT but this is not
recommended.

--
Henrik Nordstrom
Squid hacker
Kaan Gunes Celik wrote:
> 
> hello,
> we currently run a squid proxy in our campus network. In Ms Proxy Server,
> the refresh rate could be adjusted. I don't want all the time the squid
> controls the main source again and again when requested. For example I
> want a site to be controlled again after 10 hits. Is it possible ? We have
> a problem on TIME_WAIT 's are too much. Every time the squid is trying to
> connect the original site. How can I do this, thanks for the responses :)
> 
> Regards,
> Kaan Gunes Celik
> EMU Computer Center
> 
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