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Low performance even with low number of users

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Hi,

I have a "curious" case of low performance with Squid.

The symptom is that every request take at least +/- 7 seconds. Even
when there is a small number of clients.

The browser keeps waiting and when it load, it loads fast.

If I allow the client to access the web without proxy, it access
really fast. So, there's no bandwidth problems - and in fact it loads
fast after the "freeze" period. (with the same DNS, by the way).

I've tried many things. Currently, I'm using no cache on disk
(cache_dir null /tmp).So it's not related with Disk IO bottleneck.

The service time information:

Median Service Times (seconds)  5 min    60 min:
 HTTP Requests (All):   0.49576  0.32154
 Cache Misses:          0.49576  0.32154
 Cache Hits:            0.00000  0.00091
 Near Hits:             0.22004  0.15888
 Not-Modified Replies:  0.00000  0.00494
 DNS Lookups:           0.25460  0.23291
 ICP Queries:           0.00000  0.00000


But still the client can't access it fast. And what is curious: even
if I access it on a time when there's no employee, the access is still
slow.

I've tried also many "debug_options #,9", but some of the info I was
unable to interpret.

The hardware is enough for the demand - but maybe the settings are wrong.
Version 2.6.STABLE21 (CentOS)

Any hints?

Thanks.
Luiz.




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