Hello, I'm using the following global options in order to format messages with millisecond resolution: ts_format(iso); frac_digits(3); Although the initial (syslog-ng starting) message appears to include sub-second resolution subsequent messages do not: 20140415 10:19:23.590 notice syslog(syslog-ng):syslog-ng starting up; version='3.5.4.1' ... 20140415 10:19:33.000 notice authpriv(su):FAILED su for test by root ... 20140415 10:20:11.000 notice user(root):test This includes messages originating from any number of sources (including all processes that log via syslog()), *except* messages originating from the kernel (these always seem to have sub-second resolution). Does anyone have any ideas what might be going on here? Thanks, -David PS: the timestamp formatting above is done via a simple template. Regardless of this (re-)formatting nominal iso messages also exhibit this limitation. For e.g.,: 2014-04-14T15:23:48.000-07:00 host99738728 nasysconfd: exit code 0 for /netacquire/bin/sysconf/osinfo read