[squid-users] 2.7 STABLE 9 responds very slowly or stops responding

Hello,

For last 3 days I had weird problems with Squid 2.7 stable
9.
I'm running that version since it was released and it
worked just fine for these few months.

Then suddenly users behind the proxy started to report
serious slowdowns or downtimes.

This is a very low volume proxy with less than 30 users,
set-up mostly to save bandwidth during peak hours.
I'm using it myself everyday, so when the last slowdown
started I was able to look at the logs almost immediately.

When the slowdown event starts, usually the proxy almost
stops responding - for example, if I open new tab in a
brower and enter URL, it might take several minutes until
it starts loading and then it might take another couple of
minutes since the page loads completely (if it does at
all).
It lasts for a while, sometimes it will just go away
without restarting the proxy, sometimes not.
During the slowdown, any requests made do not appear in
the access log until the squid handles the request, which
as I mentioned above might take several minutes.
Also, during last slowdown I've found weird log entries in
the access.log, a sample from access log, 10.0.0.4 is the
cache IP address:

1281379957.060 899446 10.0.0.4 TCP_MISS/504 227 POST
http://10.0.0.4:3128/p4s - DIRECT/10.0.0.4 text/html
1281379957.060 899446 10.0.0.4 TCP_MISS/504 227 POST
http://10.0.0.4:3128/p4s - DIRECT/10.0.0.4 text/html
1281379957.060 899445 10.0.0.4 TCP_MISS/504 227 POST
http://10.0.0.4:3128/p4s - DIRECT/10.0.0.4 text/html
1281379957.060 899445 10.0.0.4 TCP_MISS/504 227 POST
http://10.0.0.4:3128/p4s - DIRECT/10.0.0.4 text/html
1281379957.060 899445 10.0.0.4 TCP_MISS/504 227 POST
http://10.0.0.4:3128/p4s - DIRECT/10.0.0.4 text/html

Also, the cache.log complains about cache running out of
file descriptors.
Where should I look at to find what's the cause of this
problem ? I doubt that it's the config itself, because the
proxy was running fine for like 7-8 years, upgraded
everytime when stable version came out.
Received on Tue Aug 10 2010 - 10:20:23 MDT