[squid-users] Need better debug_options values to track down cache MISSes

[Greg]

Hi all,

I'm new to squid administration, with basic *nix admin skills. My task now
is to replace an old Squid reverse proxy server (3.1.15 on an old Fedora)
with a new one (Squid 3.3.8 on Ubuntu 14 LTS) and ran into a problem.

I've spent 2 days tweaking-googling-debugging, now looking for some help...

Problem is, with the ~same configuration, the old Squid caches HTML pages
well and the new doesn't. This is a major concern, we're using Squid
exactly to do that and get the load off our appservers.

In this first mail, I'm only asking for a hint on what debug_options to
use. In previous list emails I've seen that some details help, so here they
are:
- Reverse proxy, port 80 only, one uplink straight to the app servers.
- Pretty standard configuration, standard refresh_patterns.
- Disk and memory cache, disk cache initialised with -z.
- Clocks are in sync (except for the old proxy server) using ntpd.
- Squid gives HITs for favicon.ico and RSS feeds only - these have
different headers and mimetypes compared to HTML files (and that's by
design).
- This new server seems to save accessed HTML files on disk but still gives
X-Cache-Lookup:MISS for all of them later.
- I've found the debug_options sections page but section names are
ambiguous for someone who's not a Squid programmer. I had to download the
source code, analysed it and tried "debug_options 11,1 22,6 85,3 88,5 33,1
31,5 90,5" which is too much and "debug_options 88,5 85,5 22,6 11,5 33,1"
which might be too little.
- Headers look okay (Cache-Control, Pragma, Vary), stale/fresh calculation
looks okay (pages are deemed fresh) in the debug log.
- The best I got so far is this: "client_side_reply.cc(1618)
identifyFoundObject: clientProcessRequest2: StoreEntry is NULL -  MISS",
even for pages I see in the disk cache -- I'd like to know why does it
occur, probably need some more good debug_options. I don't understand the
code too well, don't know which direction to take.

Please suggest some more good debug_options to continue with.

Best regards,
Greg

PS. Also, I'll submit another mail with the details of the problem + the
config, hoping someone spots a problem right away.
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