I’ve made three changes to the Squid-2.HEAD codebase this weekend.
First up – I’ve modified the memory allocator to not zero every sort of buffer. This can be quite expensive for large buffers, especially on older machines or very busy Squid servers. Squid-2.HEAD now has the “zero_buffers” option which currently defaults to “on”. To disable zero’ing buffers please add “zero_buffers off” to your squid.conf file. I’ve seen up to 10% CPU savings on my testbed at home but this may vary wildly depending upon work load.
Secondly – the ‘logtype’ configuration option has been removed and replaced with the ability to define logging types per logfile. You can now prefix your log line with “daemon:”, “stdio:”, “udp:” or “syslog:”. “syslog:” works the same as before; “stdio:” and “daemon:” just take a path, and “udp:” takes an IP:port URL.
To log to a UDP socket, try:
Please note though that the default UDP payload size (defined in src/logging_mod_udp.c) is 1400 bytes and any application you decide to use to dump the logfile entries must be able to receive UDP packets that big. There’s a system-wide UDP packet limit in some operating systems (for example, sysctl net.inet.udp.maxdgram under FreeBSD) to also consider. If in doubt, do a tcpdump on both sides and make sure you’re seeing the packets of the right size getting there.
Note too you can’t use these options for the cache_log – it must always be a normal file path.