[arch-general] mysqld (MySQL and MariaDB) polling

[Christian Hesse]

Hello everybody,

based on the thread "[RFC] Migration to MariaDB" in arch-dev-public by
Bartłomiej Piotrowski I started playing with MySQL and MariaDB. I noticed
both were polling every second:

<... futex resumed> )       = -1 ETIMEDOUT (Connection timed out)
futex(0x1d48050, FUTEX_WAKE_PRIVATE, 1) = 0
gettimeofday({1361806174, 246573}, NULL) = 0
futex(0x1d4808c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME,
2849, {1361806175, 246573000}, ffffffff <unfinished ...>

Searching Google I found that the problem may be caused by the leap second,
though the load is not as high as some articles describe. (Continues polling
vs. one poll a second.)

However the polling stops as soon as I manually set the time with date -s and
it start again if I run ntpdate to sync the time. As this is a notebook I
rebooted more than once since the leap second happened. ;)

What is going on? This is a mobile system, so it would be great to get rid of
mysqld eating my battery power.
-- 
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