Squid3 recently very slow

lucky

Okay, so I went ahead and checked out those things. The Median Service Times were as follows:

Median Service Times (seconds)  5 min    60 min:
        HTTP Requests (All):   0.10857  0.02899
        Cache Misses:          0.10857  0.03829
        Cache Hits:            0.00000  0.00000
        Near Hits:             0.00000  0.00000
        Not-Modified Replies:  0.00000  0.00000
        DNS Lookups:           0.01210  0.01046
        ICP Queries:           0.00000  0.00000

Which looks fine to me. I didn't do many requests, but I did enough so I got some that went through okay, some that were slow, and some that failed. I investigated one that failed, and this is what I found in the squid access.log:

1429108291.521  60287 192.168.200.104 TCP_MISS/503 4502 GET http://here.com/traffic/usa/washington-dc - ORIGINAL_DST/66.54.66.154 text/html
1429108293.842     59 192.168.200.104 TCP_MISS/301 785 GET http://here.com/favicon.ico - ORIGINAL_DST/66.54.66.154 text/html

In the browser, Squid returned an error indicating that there was a timeout contacting the site. Any time this happens, if I just refresh it usually loads just fine. The sites are not down, since at the same time I can access them just fine from other computers or browsers not configured to use Squid.

lucky

Also, I already had the option mentioned here https://forum.pfsense.org/index.php?topic=52735.msg284810#msg284810 turned on. Doesn't seem to make a difference.

KOM

No hits at all. I wonder if your cache folder hierarchy needs to be rebuilt?

IIRC, there are some issues with squid3 in transparent mode at the moment:

https://forum.pfsense.org/index.php?topic=91894.0

https://forum.pfsense.org/index.php?topic=89315.0

You might be hitting those problems as well. I've spent some time studying squid3, squidguard, sarg and lightsquid. I've gotten everything running on a Ubuntu Server 14.10 box. I will be installing a standalone proxy once Ubuntu Server 15.04 comes out next week. I've come to the conclusion that it's best to separate extra services from the basic routing firewall, so bye-bye to all packages except reporting, like bandwidthd.

lucky

Thanks for pointing out those links. I did have transparent mode on. I just turned it off and manually configured a browser to use the proxy. Also, yesterday I deleted the entire Squid cache folder structure via shell on pfSense. Still seem to have the same problem.

KOM

After you deleted it, I assume you rebuilt it with squid3 -z?

lucky

I didn't, though after the delete, I removed the entire squid3 package and re-installed it…which I assume will do the rebuild?

KOM

Should, but you should do it just to be sure.

lucky

Okay, I stopped Squid, ran this:

[2.2.1-RELEASE][root@fw]/root: /usr/local/sbin/squid -z
[2.2.1-RELEASE][root@fw]/root: 2015/04/15 16:28:15 kid1| Creating missing swap directories

And restarted Squid. Still getting the same bad performance.

KOM

I don't know what else to tell you.

lucky

Heh, np…I think my next experiment will be to set myself up to get some pcaps, on the client and on the server (both internal and WAN), to see what's happening on the network.

lucky

So I am still not sure exactly what the heck is going on. In some cases, it does appear that SYNs are not being responded to. I am not sure why. Then shortly after, it works…???

I added the following to my Squid config, on the General tab in the "Custom ACLS (Before_Auth)" section, and this is helping a lot...though still not good enough for "production":

connect_timeout 2
forward_max_tries 2
connect_retries 2