Henrik Nordström's Squid work -> Squid development and new features

My Squid development page

NOTE: This information is mostly outdated. For current developments see http://devel.squid-cache.org where development is now done in a more cooperative manner, and due to the higher degree of openness in the Squid development the need for these "personal" pages no longer exists. The page still exists for reference purposes as not all my old patches have made it into the the new development model yet, but will eventually go away completely.

• My current development patches to Squid
• Patches with merge conflicts
• Patches on hold
• Old patches

My development patches to Squid

Patches are listed in reverse order with the newest first, so if you have trouble applying a patch it is very likely that it depends on another patch further down in the list.

The Squid version number of the patch does not actually matter that much. All it indicates is what Squid version I used when I made the patch.

• Squid-2.2.STABLE5: pconn_timeout on client connections / disabling
  Changed pconn_timeout to apply to client connections as well, and added the rule that persistent connections will be disabled if pconn_timeout is < 10 seconds.
• Squid-2.2.STABLE4: cachemgr object listings improvements
  This patch speeds up object listing generation, and adds two new menu entries: "Lost StoreEntry structures" for listing objects which is neither in memory or on disk, and "Large In-Memory and In-Transit Objects" showing objects taking up an proportionally large portion of the VM cache.
• Squid-2.3.STABLE1: Delay pid file removal until shutdown
  Delay removal of the pid file until Squid is fully shut down. This is to allow scripts to monitor the pid file waiting for Squid to shut down.
• Squid-2.2.STABLE2: UNIX domain IPC communication
  Switches Squid to UNIX domain IPC communication with it's child processes instead of TCP/IP on the loopback interface.
• Squid-2.2.STABLE2: Use estimated RTT for parent selection on timeouts
  Use estimated ICP rtt when selecting parents on ICP timeouts.

Legend:

• Normal patch
• Point patches

Patches with merge conflicts

These patches requires further work to apply to the current Squid version. I plan on looking into the details when I get the time to do it.. If any of this looks useful to you then please help me do it and send the updated patch file to me (or if you don't know how it should be done, ask me to update the patch).

• Squid-2.3.DEVEL2: Solaris X86 and dlmalloc
  Configure forced dlmalloc for Solaris X86 twice. This patch removes one of the tests (unneded, didn't do anything but echo it was detected)
• Squid-2.2.STABLE4: dns_restart option to keep dnsserver in bay
  Adds dns_restart option to have dnsservers periodically restart themselves to purge memory. This is to work around apparent leaks in dnsserver (or the resolver librarby). dnsserver processes has seen growing from a few MB up to 50MB in size.
• Squid-2.2.STABLE4: Higher helper limit to avoid dns queue assertion
  Allow for a larger backlog of requests to helper processes such as dnsserver. Squid will abort with a assertion failure if the backlog grows to large. This patch changes the limit from 2*n_helpers to 5*n_helpers
• Squid-2.2.STABLE4: Disable pipeline prefetching
  Disable parallell fetches of pipelined requests. There seems to be serious problems if something goes wrong with the second request while the first one is being processed, so the safest bet is to disable this prefetching of pipelined requests for the time being.
• Squid-2.2.STABLE4: Async-IO sync fixes
  Async IO sync operation was somewhat incomplete. There could be some operations pending when the sync completed.
  Also, operations needs to be synced when switching user-id's, or it is uncertain which userid the operations get executed as.
• Squid-2.2.STABLE4: Some tuning of Async-IO code
  This patch makes some tuning of the Async-IO code to avoid wasting threads on operations which usually does not block. It also reverts to using unlinkd for unlinks even when using async-io due to some load balancing troubles. This can be tuned in include/config.h if you'd like to.
• Squid-2.4.STABLE5: proxy_auth and spaces in username or password
  Squid-2.2.STABLE3: proxy_auth and spaces in username or password
  This patch adds support for spaces in the username or password by encoding unsafe characters before calling the authenticator. Please note that this patch breaks compability with any existing authenticator modules and you need to URL unescape the username and password prior to processing or authentication will fail if unsafe characters is used in the username or password.
• Squid-2.2.STABLE3: Don't give ICP/Digest HIT on non-200 objects
  There is a common false hit condition with objects with a HTTP status other than 200 (HTTP_OK). These will cause false hits if a client sends a If-Modified-Since request.
  This patch makes a minor change to the on-disk store, and may or may not be fully compatible with future Squid releases. Don't use this patch unless you are prepared to clean your cache on next upgrade.

Patches on hold

These patches are patches which require more work to be used in the current Squid releases, but which in my opinion is a step in the right direction for the design. They are kept here mostly for reference and as a reminder.

These patches are not actively maintained, and is provided as a reference only. Don't apply these to your Squid.

• Squid-2.3.STABLE1: Add content-length on cache hits if none
  Add a content-length header to cache hits if none was sent by the origin server.
  This patch is on hold because of bugs with IMS-HIT, and perstent connections.
• Squid-2.2.DEVEL3: Assertion failure caused by F->flags.closed patch
  My patch for F->flags.closed assertions was incomplete and could cause another assertion failure. This cleanup of pump.c attempted in the previous patch and continued here will probably be delayed until the next Squid version since a working workaround have been found which does not change pump.c.
• Squid-2.2.DEVEL3: Fix for an assertion failure on aborted FTP PUT
  Squid failed with assertion "F->flags.closed" on aborted FTP PUT requests. This patch is a cleanup of some of the interactions between the pump module and ftp.c, and this is why it is kept in the reference section. The bug it claims to fix is already worked around in another part of the code.