I have started to prepare syslog-ng 1.6.10 for release, the tarball has already been uploaded to the website, but I still have not sent an announcement to the mailing lists. So if you read this here, you might download a still unannounced version :)
Nothing really important in the release, a cleanup in the documentation with several fixes and a migration to DocBook/XML from the SGML favour and a new tunable called time_sleep().
The latter was worked out together with John Morrissey who did some profiling and found that on hosts with a lot of syslog connections syslog-ng might become a bottleneck. The option does nothing but sleep() a defined amount of time which makes syslog-ng to process incoming messages in batches, this way decreasing the number of poll() loop iterations which was listed high (about 67%) in the profiles generated by John.
Setting time_sleep() to about 50ms decreased the CPU load by 80% which is quite significant I'd say.
As Rusty Russell would say I have just received a SIGWIFE, so going to bed now :)