tree 9f7b47429e7c0f539343069d5f16f8319bb6f54a
parent b67e1558955c1c88dc2a3530322802ce3710bc88
author Willy Tarreau <w@1wt.eu> 1608629743 +0100
committer Willy Tarreau <w@1wt.eu> 1608629743 +0100
encoding latin1

MINOR: time: increase the minimum wakeup interval to 60s

The MAX_DELAY_MS which is set an upper limit to the poll wait time and
force a wakeup this often used to be set to 1 second in order to easily
spot and correct time drifts. This was added 12 years ago at an era
where virtual machines were starting to become common in server
environments while not working particularly well. Nowadays, such issues
are not as common anymore, however forcing 64 threads to wake up every
single second starts to make the process visible on otherwise idle
systems. Let's increase this wakeup interval to one minute. In the worst
case it will make idle threads wake every second, which remains low.

If this is not sufficient anymore on some systems, another approach
would consist in implementing a deep-sleep mode which only triggers
after a while and which is always disabled if any time drift is
observed.