Commit f70270f7 authored by Jeremy's avatar Jeremy
Browse files

Issue #1472332 by Jeremy, markpavlitski: better explain Binary protocol and TCP_NODELAY

parent bcd9c751
......@@ -262,7 +262,8 @@ configure memcached in settings.php. Please look here for possible options:
http://us2.php.net/manual/en/memcached.constants.php
An example configuration block is below, this block also illustrates our
default options. These will be set unless overridden in settings.php.
default options (selected through performance testing). These options will be
set unless overridden in settings.php.
$conf['memcache_options'] = array(
Memcached::OPT_COMPRESSION => FALSE,
......@@ -271,14 +272,22 @@ $conf['memcache_options'] = array(
These are as follows:
* Turn off compression, as this takes more CPU cycles than its worth for most
* Turn off compression, as this takes more CPU cycles than it's worth for most
users
* Turn on consistent distribution, which allows you to add/remove servers
easily
If you are using memcached 1.4 or above, you can enable the binary protocol,
which may be faster, by adding the following to settings.php:
$conf['memcache_options'] = array(
Memcached::OPT_BINARY_PROTOCOL => TRUE,
);
Other options you could experiment with:
+ Memcached::OPT_BINARY_PROTOCOL => TRUE,
* This enables the Memcache binary protocol (only available in Memcached
1.4 and later). Note that some users have reported SLOWER performance
with this feature enabled. It should only be enabled on extremely high
traffic networks where memcache network traffic is a bottleneck.
Additional reading about the binary protocol:
http://code.google.com/p/memcached/wiki/MemcacheBinaryProtocol
+ Memcached::OPT_TCP_NODELAY => TRUE,
* This enables the no-delay feature for connecting sockets; it's been
reported that this can speed up the Binary protocol (see above). This
tells the TCP stack to send packets immediately and without waiting for
a full payload, reducing per-packet network latency (disabling "Nagling").
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